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EUROPEAN ORGANISATIONFOR THE SAFETY OF AIR NAVIGATION

EUROCONTROL EXPERIMENTAL CENTRE

STIF Interface(Speech T echniques for

sImulation F acilities)

EEC Note No. 25/96

EEC Task R 10EATCHIP Task FCO.5.02

Issued: December 1996

The information contained in this document is the property of the EUROCONTROL Agency and no part should be reproduced in anyform without the Agency’s permission.

The views expressed herein do not necessarily reflect the official views or policy of the Agency.

EUROCONTROL

NOTE DOCUMENTATION PAGE

Reference:EEC Note No. 25/96

Security Classification:Unclassified

Originator:EEC - IST(Innovative Support Tools)

Originator (Corporate Author) Name/Location:EUROCONTROL Experimental CentreB.P.15F - 91222 Brétigny-sur-Orge CEDEXFRANCETelephone : +33 (0)1 69 88 75 00

Sponsor:EATCHIP Development DirectorateDED.1

Sponsor (Contract Authority) Name/Location:EUROCONTROL AgencyRue de la Fusée, 96B -1130 BRUXELLESTelephone : +32 2 729 9011

TITLE:

STIF Interface (Speech T echniques for sI mulation F acilities)

Author

H. Hering

Date

12/96

Pages

viii + 47

Figures

6

Tables

2

Appendix

12

References

-

EATCHIP TaskSpecification

FCO.5.02

EEC Task No.

R 10

Task No. Sponsor Period

01/1996 - 10/1996

Distribution Statement:(a) Controlled by: Head of IST(b) Special Limitations: None(c) Copy to NTIS: YES / NO

Descriptors (keywords):STIF, Speech Techniques for sImulation Facilities, Speech Synthesis Interface, Speech RecognitionInterface, ATC Simulator, ATC Communication System,

Abstract:For the evolution of new advanced techniques, like speech synthesis and speech recognition, in an ATCsimulation or experimental environment the existing equipment has to be interfaced to this advancedtechnique. Out of the shelf speech techniques existing for standard PC’s with multimedia capabilities.These techniques may be used to increase pseudo pilot’s capacities by automatically generated actions(computer) and synthesised speech for the communication with the controller. This note prescript thedevelopt hardware interface STIF.

This document has been collated by mechanical means. Should there be missing pages, please report to:

EUROCONTROL Experimental CentrePublications Office

B.P. 1591222 - BRETIGNY-SUR-ORGE CEDEX

France

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Table of Contents

1. Abstract 1

2. General 1

3. Structure of the Interface 3

4. Implemented STIF Modes 3

4.1 ATC Modes (Transparency Modes) 34.1.1 ATC-C Mode 44.1.2 ATC-P Mode 4

4.2 Test Mode 4

5. Detection of Speech in the ‘ATC Modes’ 5

5.1 Different Detection Techniques 55.1.1 Conclusion of the Data Monitoring 6

5.2 Speech Detection with the PTT Switch (Speech Input) 75.3 Speech Detector (Squelch Detector) for Speech Output 75.4 Speech Detection via Data Monitoring (RS 232) for Speech Output 9

6. Motherboard 9

7. VF - Modules of STIF 9

7.1 VF - Attenuator 97.2 VF - Signal Level Display 107.3 VF - Mixer 10

8. Voice Recorder Interface 10

9. Front Panel 11

10. Back Panel 13

11. Interconnection to the ATC Simulator (Frequentis System) 14

12. Interconnection with the Speech System PC 14

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13. Acknowledgements 14

14. Bibliography 15

Appendix A - EEC Voice Signal Levels of the Frequentis System 17

Appendix B - VF Speech Detector Module 18

Schematic 18 Board Layout 19 Connector Layout 20 Calibration of the Speech Detector Module (Squelch Detector) 20

Appendix C - Speech Detection via Data Link Monitoring 22

Overlook of some Frequentis internal Communication Principals 22 Relevant Data Frames for the STIF Interface 22

Appendix D - Attenuator Module 24

Schematic 24 Board Layout 25 Connector Layout 26

Appendix E - VF Level Display Module 27


Appendix F - VF - Mixer Module 30


Appendix G - Motherboard 33

Schematic 33 Board Layout 34 Connector Layouts 35

Connector P 01 35 Connector P02 (Headset) 35 Connector P03 (Front-Panel Switches) 36 Connector P 04 (Front Panel LED’s) 36 Connector P 05 (opt. ‘Relay Channel occupied’ for Speech System) 36

Appendix H - Wiring List for Front-Panel 37

Lemo 10F Socket (Headset) 37 LED’s 37

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Switches (S 01, S 02) 37 Potentiometer (VF - Level Control) 38 Signal Level Display 38

Appendix I - Wiring List for Back-Panel 39

Lemo 10B Socket 39 Lemo 03 Socket (option: Version Lemo 05 Socket) 39 DB 25 Socket (RS 232 ATC Simulator Panel Link) 39 DB 09 Socket (RS 232 Speech System) 40 S 03 Switch (Record/Replay) 40 S 04 Switch (Mic./Radio) 40 VF Cinch (Record VF) 41 VF Cinch (Record PTT) 41 VF Cinch (Replay VF) 41 VF Cinch (Replay PTT) 41

Appendix J - STIF - X 471 Wiring 42

Appendix K - Voice Recording Interface 43

Schematic 43 Board Layout 44 Connector Layouts 45

Connector P 21 (Rear Panel Selector Switches) 45 Connector P 22 (VF Signals representing PTT Switch) 45 Connector P 23 (Speech VF Signals) 45 Connector P 10 (Motherboard) 46

Appendix L -RS 232 Speech System Signals 47

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1. AbstractFor the evolution of new advanced techniques, like speech synthesis and speech recognition,in an ATC simulation or experimental environment the existing equipment has to beinterfaced to this advanced technique. Out of the shelf speech techniques existing for standardPC’s with multimedia capabilities. These techniques may be used to increase pseudo pilot’scapacities by automatically generated actions (computer) and synthesised speech for thecommunication with the controller.

2. General

The EEC centre of expertise IST (Innovative Support Tools) developed a hardware interfacecalled STIF (Speech Techniques for sImulation Facilities), on the request of the Eurocontrolheadquarters (DEI 1). The idea of this interface is to connect a speech system PC (voiceinput/output only) to a standard ATC (Air Traffic Control) communication system at the levelof the controllers headset. The advantage of such a concept is that the ATC communicationsystem may be used without any modification and undesirable interactions may be excludedvery easily.

ATCCommunication System

Control Panel

HeadsetConnector

Headset

STIF

Controller’s or

Pseudo-Pilot‘sHeadset

Speech System

(Speech Recognition and Synthesis)

VF - SignalsandData Link

VF - SignalsandPTT Switch

VF - SignalsandPTT Switch

withoutSTIF

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For a more general use of the STIF interface some other functionality’s are added:

• interfacing a standard ATC controller headset to the speech system PC; • special out/inputs for voice and PTT switch (Push To Talk)

recording/replaying for easy repetitive and comparative testing; • optional monitoring of a serial data link for speech detection on the

‘Frequentis’ ATC communication system; • signal level adjustments for easy adaptation on different speech systems.

These extensions make the development and testing of speech application simpler. Theinterface may then as well be used for repetitive and comparative testing of applications fromdifferent manufactories with the same recorded voice samples.

The STIF interface is fully transparent for voice frequency (VF) signals between thecontroller’s headset and the ATC communication input plug. The headset PTT switch isisolated from the communication system and emulated by a fast (max. 300 Hz) relay for theATC system.

The speech system computer is connected (high impedance > 5 kΩ) in parallel to thetransparent VF links (headset - communication system). Logical data (e.g. presence ofspeech, PTT switch etc.) are received and sent to the speech system host via the use of thesignal lines of a serial communication port.

STIF’s concept is modular. The motherboard is built as some kind of ‘voice bus’ betweenATC simulator, headset and speech system. Small modules with special functions (attenuator,mixer, speech detection, VF level display and recording/replaying interface) are plugged on it.

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3. Structure of the Interface

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA








ATC Communication System (‘Frequentis’)

Controller/’Pilot’Headset

Voice Recorder

Speech System

VFSignals

VFSignals

VFSignals

VFSignals

RS 232Data

RS 232Data

Digital Data

Speech Detection

VF - Voice Signals

optional

STIF

PTT SwitchPTT Switch

PTT Switch

4. Implemented STIF Modes

With a switch on the front panel of the interface, STIF’s mode of operation will be selected.Three modes are possible: ‘ATC-P Mode’, ‘ATC-C Mode’ and ‘Test Mode’. The PTTswitch on the front panel is active in all modes. The two attenuator buttons and their VF leveldisplays (front panel) are located in the speech system PC link. This means they influenceonly the VF lines of the speech system plug (back panel) to adapt their levels between thenormal ATC communication levels and the speech system levels.

4.1 ATC Modes (Transparency Modes)

The two implemented ATC modes ‘ATC-P’ and ‘ATC-C’ are very similar. Only the sourceof the speech for the recognition system is different. This gives the possibility to use STIF at

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the controller working position (‘ATC-C’ mode) and at the pseudo pilot position (ATC-P’mode).

The connected headset (front panel) is linked ‘directly’ (level adaptations) to the VF plug(back panel) for the ATC communication system. The STIF power supply has to be switched‘ON’. The synthesised VF signal of the speech system PC is mixed to microphone line of theheadset. In this case the PTT switch has to be pressed with a signal from the speech system.If the communication system provides a feed-back on the controller’s earphones, the messagewill be heard on the headset.

4.1.1 ATC-C Mode

In the ‘ATC-C’ mode, speech signals coming from the controller’s microphone (connected atthe front panel of STIF) are connected to the speech system for the recognition task. Thesignal level may be adjusted for the input to the speech recognition device. The full range ofthe microphone frequency is available to the speech system.

4.1.2 ATC-P Mode

‘ATC-P’ mode means, that the controller’s speech, coming from the ATC communicationequipment (radio line), is used as source for the recognition device. The connected speechsystem computer will receive at its speech input (‘microphone’) the adapted signal of theearphone of the headset. In the case that the right and the left earphone have a different VFsignal (telephone, radio) the radio signal is selected for the speech system. The frequencyrange is limited by the communication system.

4.2 Test Mode

This mode allows to test the speech recognition device independent of any ATCcommunication equipment. The connected headset is linked to the VF socket (back panel) ofthe speech system PC. The headset’s microphone is connected to microphone input of thespeech system PC and the synthesised speech is linked to both earphones of the headset. TheVF lines of the ATC simulator (back panel socket) are isolated from this interconnection(PTT switch and detection of speech active).

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5. Detection of Speech in the ‘ATC Modes’

5.1 Different Detection Techniques

The normal ATC radio communication is based on the principle that only one partner(controller, pilots) may speak at the same time on the frequency. An artificial speech systemneeds the information about channel occupation for the recognition (start and end of thespeech) and for the insertion (into a cab of speech) of synthesised speech.

A controller speaks after pressing a PTT switch. The PTT switch may be located on themicrophone, in a small case of the headset cable, in a panel of his working position or in afoot-switch. STIF is only able to detect PTT switch actions which are directly linked to thelines of the ATC communication plug (microphone and headset PTT switch) and its ownPTT switch.

A pilot may speak at anytime the communication channel isn’t used. Therefore STIF has towatch the incoming radio communication and generate a digital signal after pilot’s speech isstarting (delay < 10-6 s). If right and left earphones of the controller’s headset have separatevoice signals, each one is watched.

In the case of the Frequentis ATC communication system, a third method of the detection ofthe presence of speech was worked out. The telephone and radio communication controlpanel of a controller working position of the Frequentis system is linked with a special serialdata link to an interface of the communication system. The data stream of this link containsall information about the VF channel use. By filtering the relevant data frames, the VFchannel occupation may be decoded.

Presence of Speech detected bySource of Speech PTT Switch Speech Detector RS-232 Link

Controller viaCommunication System

(ATC-P mode)no yes yes

Controller with PTTSwitch in Micro. or STIF’s

(ATC-C or Test mode)yes no yes

Controller with FootPTT switch

(ATC-C mode)no no yes

The previous table shows the limits of the usage of the different detection methods. Thedisadvantage of the detection with the RS 232 monitoring is that this technique may be to

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‘time consuming’ and the incompatibility with other ATC communication systems.

The status of the different ‘Speech Detectors’ and the ‘PTT’ switch is reported via differentstatus lines of the RS 232 port to the speech system PC.

5.1.1 Conclusion of the Data Monitoring

Supposing a controller starts speaking in time with pressing his PTT button. The Frequentissystem activates with this PTT information the voice transmission chain. The delay betweenthe PTT switch pressed and the first voice pattern transmitted is for the Frequentiscommunication system of Bretigny >= 100 ms. This means the first 100 ms of the speech arelost for the receiving Frequentis panel (headset) of pseudo-pilots and controllers.

For speech inputs (microphone) to the Frequentis system via the STIF interface this isn’t aproblem, as STIF handles direct the status of the PTT switch. For the Frequentis systemSTIF emulates the PTT switch by a fast relay (delay <2 ms).

Speech outputs (to the earphones of the headset) from the Frequentis ATC communicationsystem may be detected by STIF’s speech detector module little time (type: <1 ms) after firstvoice pattern starts. This increases the number of voice patterns ‘lost’ outside of thegenerated PTT switch (from STIF’s module) frame for the complete communication chain.

By decoding Frequentis RS 232 data communication from interface to the control panel (forspeech output) the speech system can be informed about the channel activation before thereal speech starts. This means not that the system start delay of >= 100 ms will be reduced,but the generated PTT ‘frame’ starts in this case some milliseconds earlier than the speechoutput.

In the case STIF is used in ATC - P mode, the speech system may be cut of from the speechstart (approx. 100 ms) by the communication system.

The following picture shows the relation of the PTT switch and the speech VF on differentlevels. Monitoring of the RS 232 link could be a time consuming advantage.

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PTT Switch (real primary)

Voice Frequencyof Speech Input

Transmitted andReceived VF of Speech Input

Generated PTT Switchof STIF’s Speech Detection Module

Decoded PTT Switchfrom Frequentis Data Link Monitor (RS 232, estimation)

Frequentis SystemStart Delay (VF lost - approx. 100 ms)

Detection Delay (<1 ms)

Speech End Detection Delay (adjusted ~ 500 ms)

5.2 Speech Detection with the PTT Switch (Speech Input)

This mode is based on the active corporation of the controller as he will be asked only to usethe PTT of the hand microphone, the headset or the PTT switch on the front panel of theSTIF interface. (The PTT information of the normal ‘foot switch’ isn’t available as signal onthe headset connector.) For the ATC communication system this switch is emulated by arelay.

5.3 Speech Detector (Squelch Detector) for Speech Output

The detection of the presence of speech on a communication line may cause seriousproblems. Especially isolated spoken very short words (e.g. ‘I’, ‘no’), relative long pausesduring the speech, low voice and a bad signal noise relation on the line give problems todetect the speech frame surely.

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For this interface it was requested to detect the start of the speech as quick as possible. Bythis reason a comparator circuit was used for the detection of the presence of a signal higherthan the line noise. This signal is than “integrated” with a retriggerable monoflop to eliminateshort pauses during the speech.

Input: Speech

Output:Speech Frame

uminUp

Upp

tdelay tpause

Upp speech signal (peak to peak)

Up positive part of the speech signal

umin minimum signal level for the detection of speech

tdelay maximum time delay of the output signal ‘Speech Frame’ after speech detection

tpause maximum time of a pause (Up < umin) within a spoken utterance

Conditions for the Detection of Speech

The realised speech detector has following limit values:

• umin : 50 mV....1.4 V• tpause : 200 ms....600 ms• tdelay : < 1 ms.

The value of umin and tpause may be adjusted by potentiometers (on board) to the wishedvalues. These values have to be fixed in relation with the measured signal levels of the usedcommunication system. tdelay is given by the switching behaviour of the used integratedcircuits.

This speech detector module is realised on a small board, plugged in a connector on the STIFmotherboard.

For VF signal levels of the EEC Frequentis system see appendix A.

Hints for the calibration of this module are in appendix B.

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5.4 Speech Detection via Data Monitoring (RS 232) for Speech Output

The manufacturer ‘Frequentis’ (Austria) is very successful with his advanced ATCcommunication system. This system is PC based with digitised internal speech links. AFrequentis system is operational at the ATC centre Maastricht and at the EEC (EurocontrolExperimental Centre). In this system, a non standard serial link is charged with the dataexchange of the controller’s communication panel and the system. On this data link theoccupation of the voice communication link for this control position are available. Thischannel occupation data are present prior the digitised voice data (for speech output via loudspeaker or earphones) are converted into analogue speech. The STIF interface gives theconnected speech system the possibility to monitor these data line on its serial connection.

For detailed information see appendix C.

6. Motherboard

For the modular structure (for VF signals) of the STIF interface the motherboard wasdesigned with a bus in form of a ‘Y’. The VF signals are treated on separate small boards(with a single task each) which are plugged to the bus. The motherboard handles VF signalswitching (for the different modes) and all digital signals only. The advantage of this design isthat all VF-boards may be tested and calibrated with a simple test-bench.

For details see appendix G.

7. VF - Modules of STIF

7.1 VF - Attenuator

Signals coming from the headphone or the PC’s loudspeaker are to high (Frequentis EEC:max. 1.7 Vpp for a sinus input signal of 0.8 Vpp) to be fed directly into any microphone input.Therefore the signal has to be attenuated. For this propose a standard operation amplifier isused.

The attenuator module is located on separate board with two connectors. With one connectorthe module is fixed in a slot of the STIF motherboard, the other is for the connection of thepotentiometer of the ‘gain’ regulation. This attenuation/gain may be varied by apotentiometer from 0.12 to 1.4.

For details see appendix D.

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7.2 VF - Signal Level Display

For simple monitoring of the output signal of the attenuator/amplifier a level indicator,composed by seven LED’s, is added. This display module is plugged in a motherboardconnector and has on the other side a connector for the LED bar. Each LED is driven by aseparate voltage comparator. The comparators have different fix DC levels (seven equalsteps) as reference to the rectified and integrated VF signal. Start and end of the referencearea may be adjusted with two potentiometers.

For details see appendix E.

7.3 VF - Mixer

This module mix the VF signals of the headset microphone and the synthetic voice of thespeech system together for the microphone input line of the ATC simulator. The headsetmicrophone line may be amplified (fix gain: 1...10). The level of the synthetic voice may becontrolled by the front-panel potentiometer.

For details see appendix F.

8. Voice Recorder Interface

Using a high quality recorded voice input for a speech engine is the only way to havereceptive times the same speech input to one or several speech devices. Comparative testingof several speech engines and the fine tuning should always be done with recorded speechsamples.

Recording/replaying makes use of both channels of a stereo voice recorder. One channel isused for the analogue voice signal the other for the recording of the PTT switch information.The PTT switch is represented as 15 kHz signal during speech pauses (PTT switch released)to eliminate interference with the speech signal.Attention: recorder source selector switch on “Replay” (rear panel) without recorded inputsignal of a PTT switch, will be interpreted as pressed PTT switch!

The recording/replaying is strongly related to the STIF mode of operation and the recorderinterface switches shown in the following table:

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STIF Interface ModesATC - Modes Test -Mode

VF Signal PTT VF Signal PTT

MicroRecordfrom

HeadsetMicrophone

Headset’s or STIF’sPTT Switch

HeadsetMicrophone

Headset’s or STIF’sPTT Switch

Replayto/as

ATC SimulatorMicrophone

emulate STIF’sPTT Switch

Speech SystemMicrophone


RadioRecordfrom

HeadsetEarphone

Speech Detectoror Speech System*

Speech SystemSynth. Voice

Speech System

Replayto/as

HeadsetEarphone


HeadsetEarphone


* special jumper setting of STIF and the ‘Speech System’ host has to use the RTS line of its RS232 port for this purpose

For details of the voice recorder interface see appendix K.

9. Front Panel

STIF

Headset

PTT

Mode

Test ATC-P ATC-C

Microphone

Speech System VF Level Control

Synthesizer

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Headset Connector(Lemo10F)

Local PTT-Switch (S 01)

LED Channel occupied (L 01)

Mode Switch (S 02)

LED Speech System (L 02)

LED’s VF Signal Level(LED1....LED7)

Potentiometer VFSignal Level

LED’s VF Signal Level(LED1....LED7) Potentiometer VF

Signal Level

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Beside the socket (10 pins type ‘LEMO’ JAX 3) for the controller headset (in/output of VFcommunication and PTT switch), the following elements are located:

• one switch for the interface mode: ‘Test’ - ‘ATC-C’ - ‘ATC-P’:

• ATC modes: the VF sockets ‘ATC-Simulator’, ‘Headset’ and ‘speech system’ are interconnected;

• Test mode: only the VF sockets ‘Headset’ and ‘speech system’ are interconnected;

• one button for the attenuation from the ‘speech system’ PC’s syntheticvoice output to the ‘ATC-Simulator’ microphone input (ATC modes) witha level indicator LED band (seven LED’s), in the ‘Test’ mode the output isconnected to the earphones of the controller headset;

• one button for the attenuation from the ‘ATC-Simulator’ radio

communication (ATC-P mode) signal output to the ‘speech system’ PC’smicrophone input with a level indicator LED band (seven LED’s); in ATC-C and Test modes the VF signal from the headset is displayed and adjusted;

• one push-button as PTT (Push To Talk) switch; • one indicator LED (located in the PTT switch) for ‘communication channel

occupied’, activated by speech (squelch) detector, PTT switch of the panel,PTT switch of the headset or from the speech system PC;

• one indicator LED for ‘interface ready’ - interface hardware and speech

system PC’s program is running. In case of the use of the optional detectionof ‘communication channel occupied’ by the speech system (via RS 232ATC communication link monitoring), the STIF interface may be informedvia this line (jumpers) from the speech PC for the correct recording of thePTT switch.

For wiring details see appendix H.

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10. Back Panel

ATC - Simulator

VF - Signal

Digital Data (optional)

Speech System

VF - Signal

Digital Data

Record

VF PTT

Replay

VF PTT

Mic.

Radio

Record

Replay

Power Connectorwith Switch and Fuse

Speech SystemVF Connector (Lemo 03)

ATC - SimulatorVF Connector (Lemo 10F)

ATC - SimulatorPanel Link (DB 25F)

Speech SystemData Connector (DB 09M)

Recorder Interface Panel

VF Outputsfor the Recorder

VF Inputsfrom the Recorder

Recorder SourceSelector Switch (S 03)

VF SourceSelector Switch (S 04)

On the rear panel of the interface the following sockets for the interconnection with the ATCsimulator communication system and the speech system PC are located:

• in/output to the ‘ATC-Simulator’ VF communication interface - socketwith 10 pins type ‘LEMO’ JAX 3;

• input for monitoring the ‘Frequentis panel communication’ (optional)-

socket DB 25 for RS 232 communication (19200, N, 8, 1); • input/output to the ‘speech system’ PC - socket DB 9 for RS 232

communication (19200, N, 8, 1); • in/output to the ‘speech system’ PC VF communication interface - socket

with 3 pins type ‘LEMO’ JAX 2 (optional 5 pins including PTT switchsignal);

• input for 220 V power cable - socket type CEE 22 with integrated switch,

fuse and light For wiring details see appendix I.

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11. Interconnection to the ATC Simulator (Frequentis System)

STIF is connected with a multiple wire cable to the ATC simulator communication interface.This may be with a cable to the normal controller’s headset connector (wired 1:1) or to theconnector ‘X 471’ of the Frequentis interface ’BGT APL 01’. The first one isn’t allowed ifthere is any signal modification (amplifier...) between headset- and ‘X 471’ connector.

For the RS 232 monitoring of the Frequentis panel communication with the Frequentisinterface ’BGT APL 01’ a ‘RS 232 Multi Port Adapter’ is introduce between the ‘X 371’socket of the ’BGT APL 01’ and the cable connected first at ‘X 371’. From a third socket ofthe ‘RS 232 Multi Port Adapter’ a standard RS 232 cable is connected to the DB 25 socketon the rear STIF panel.

The cable wiring for the ‘X 471’ connector is shown in appendix J.

12. Interconnection with the Speech System PC

On the back panel of STIF are two connectors for the speech PC. The 3 pin LEMO socket (5pin as option if a hard PTT switch is needed) is connected to the multi-media interface card(e.g. Sound-Blaster) of the PC. There are only analogue voice signal on this cable. The othercable is a standard RS 232 cable for 9 pin DB 09 sockets. On the PC this one has to beconnected to the serial port used by the speech software. This is the data link (VF line states,PTT switch, optional data link monitoring) between STIF and the speech system.

The legend for these sockets are shown in appendix I - Wiring List for the Back-Panel.

Signal interpretations of the DB o9 socket are in appendix L.

13. Acknowledgements

The initial idea for the development of STIF comes from Mr. J. Pouzet Eurocontrol HQ (DEI1) in knowledge of EEC activities in speech recognition (EEC note 2/95) and man machineinterface (EEC note 24/94).

My colleague Gilbert Coatleven participated with great effort in producing the prototypes fortesting, measuring, calibrating and many other tasks. Thanks as well to Mme Maryse Meletthe good cabling spirit of the EEC for their well done job and the élan for the multiplemodification

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14. Bibliography

For the development of STIF, the technical data sheets of the integrated circuits were usedintensively. As they exist from many different chip manufacturer no special reference isneeded.

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Appendix A - EEC Voice Signal Levels of the Frequentis System

On the Frequentis communication system of the EEC Bretigny we measured at the output ofthe headset microphone approximate 0.8 Volt (amplified, peak to peak) with a normalspeaking loudness as a mean value. The Sennheiser headset (type HME 1410 KA)microphone was positioned 2 cm ahead of the edge of the mouth. This headset has anintegrated microphone amplifier.Remark: For the speech recognition task the new Sennheiser headset (HME 45-KA) for jetcockpits with noise cancelling microphone should be used. The output signal of the HME 45-KA is smaller than this of the HME 1410-KA. The difference may be compensated byadjusting the fix gain of the mixer module.

The following table give the headphone output voltages (peak to peak) of the EECFrequentis System for the radio and telephone communication. The results are independent ifonly one or both earphones are connected together (one ear radio and one ear telephone orboth ears radio) as each earphone has an independent amplifier and control.

Uin = 800 mVpp (sinus);gain: set to maximum for each channel;noise = 100 mVpp;

RL = 600 Ohms (each channel)

Input Frequency(Hz)

Output Radio Channel[Vpp]

Output TelephoneChannel [Vpp]

300 1.2 1.3500 1.4 1.51000 1.5 1.52000 1.7 1.73000 1.7 1.73500 1.5 1.53700 1.3 1.34000 0 0

Maximum Headphone Output Voltages

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Appendix B - VF Speech Detector Module

Schematic

IC 1LM 311P

Signal OUT

Signal IN 5

22µ

0.1µ

7

2

R 100k

0.1µ

+12V

IC 2MC 14538

+12V

3

2

7

8

4 1

+12V

1/4/8/12/15

3/11/13/16

TP

TP

R 500k

1µ

TP

U ref

1µ100p

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Board Layout

R 27k

C22µ

C .1µ

Connector

Ground SignalIN OUT

IC 1LM 311P

+12 VGround Signals

OUT IN

C .1µ

C 1µ

IC 2MC 14538

C 1µ

Potentiometer 100k(U ref: 0.1 ...2V)

Potentiometer 500k(t pause: 0.2 ... 0.6 s)

1 8AB

U ref

R 5.6k

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Connector Layout

Pin # Signal Name

1A Digital Detector Signal OUT (high = no speech)1B VF - Signal IN (from Radio or Telephone)

2 A+B n.u.3 A+B n.u.4 A+B n.u.5 A+B n.u.6 A+B Ground7 A+B Ground8 A+B +12 V

Remarks:May be plugged to P 14 (telephone channel) or P 15 (radio channel);

Calibration of the Speech Detector Module (Squelch Detector)

The module is adjusted by default to the following values:

• umin > 100 mVp (equal a signal of 200 mVpp)• tpause = 500 ms.

The value of umin is chosen with reference to the values shown in appendix A (noise level 100mVpp, signal level 0.8 Vpp).

With the potentiometer (100 kΩ) on the squelch module, Uref (TP on module) representingumin may be adjusted. For small values Uref = umin.

The following chart gives the relation for higher values of Uref.

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0,6

0,7

0,8

0,9

1

1,1

1,2

1,3

1,4

1,5

0,4 0,5 0,6 0,7 0,8 0,9 Uref [VDC]

Upp [Vpp] (sinus) = 2U min

With the 500 kΩ potentiometer the set-time of the a retriggerable monoflop (MC 14538) isadjusted. clock wise turning degrease the set-time. For adjustments a trigger generator and anoscilloscope are needed. tpause = 500 ms means that the signal ‘speech detected’ change 500ms after the VF speech signal was smaller than umin.

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Appendix C - Speech Detection via Data Link Monitoring

Overlook of some Frequentis internal Communication Principals

The control panel of the Frequentis ATC communication system of a controller workingposition is linked to a centralised interface of the communication system. Parts of thisinterconnections are realised via standard DB 25 connectors. The pin occupation of thisconnectors are non standard. By introducing a T-connector, the link may be monitored. Thecabling in the interface is done in a way that a line (data from Frequentis system interface tothe Frequentis control panel) can be observed.

The data link try to emulate a synchron communication. The following port parameters areused:

• 19 200 baud,• 8 bit /character,• no parity bit,• 1 stop bit.

Permanently two different synchronisation frames with 3 bytes are sent. The frames A and Bare sent alternatively:

• frame A: 0x01, 0x00, 0x01,• frame B: 0x08, 0x00, 0x08.

In this synchronisation stream a variable number of data bytes (data frame) may be introducedat the end of frame A or B. The end of the data frame has to be detected by the presence ofthe next synchronisation frame. The synchronisation frames at the start and at the end of adata frame are different (e.g. ‘....+frameA+DATA-frame+frameB+frameA++frameB+frameA+frameB+DATA-frame+frameA+DATA-frame+frameB+....’). Two dataframes are separated by at least one synchronisation frame.

Relevant Data Frames for the STIF Interface

The following list of data frames are from general interest for the interpretation with the STIFinterface:

• 0x21, 0x0f, 0xda, 0x41, 0xb5 Freq. panel PTT switch pressed,• 0x21, 0x0f, 0xda, 0x11, 0xe5 Freq. panel PTT switch released,• 0x21, 0x0f, 0x3c, 0x41, 0x53 Freq. panel ‘radio cha. occupied’ light ON,• 0x21, 0x0f, 0x3c, 0x11, 0x03 Freq. panel ‘radio cha. occupied’ light OFF,

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The precedent data frames may be used only for one or both directions of VF signals (inputvia microphone, output via earphone /speaker). In the logical way some data frames have tobe followed by others.

Pressing the PTT switch of the Frequentis panel for voice input with the microphone willgenerate the following sequence of data frames:

‘Freq. panel PTT switch pressed’ + ‘Freq. panel ‘radio channel occupied’ light ON’ (speaking voice)..........‘Freq. panel PTT switch released’ + ‘Freq. panel ‘radio channel occupied’ light OFF’.

Voice signal output to the speaker/headset generate the following data sequence:

.....‘Freq. panel ‘radio channel occupied’ light ON’

......(speaking voice)......

.....‘Freq. panel ‘radio channel occupied’ light OFF’.

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Appendix D - Attenuator Module

Schematic

R 82k

R 22k

IC 1TL 072CP

Signal OUT1

Signal IN

100p

2

3

+12V-12V

22µ 22µ

0.1µ0.1µ

8

4

R 100k

TP

TP

P 001

Front Panel

Remarks:

The linearity was successful tested for the area from 500 Hz until 4.5 kHz. The noise level issmaller than 50 mV. The output signal has to respect the limits of the +12 V -12Valimentation.

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Board Layout

R 82k

R 22k

C22µ

C .1µ

Connector

Ground/Screen

Potentiometer 100k(Gain: 0.12 ... 1.4)

Ground SignalOUT IN

IC 1TL 072CP

+12 VGround-12 VSignals

OUT IN

C22µ

C .1µ

1 8AB

P 001

STIF

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Connector Layout

Pin # Signal Name

1A VF - Signal OUT (IN * gain)1B VF - Signal IN

2 A+B n.u.3 A+B n.u.4 A+B -12 V5 A+B n.u.6 A+B Ground7 A+B Ground8 A+B +12 V

Remarks:Output signal inverted; may be connected to P 13 (Synth. voice of the speech system) or P 16(Mic. input of the speech system);

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Appendix E - VF Level Display Module

Schematic

0.1µ

IC 2 LM 339N

+12V

IC 1TL 072CP

1

Signal IN

100p

2

3

+12V-12V

22µ 22µ

0.1µ0.1µ

8

4

IC 3 LM 339N

R 680

0.1µ

3

3

12

12

10

11

8

9

6

7

4

5

10

11

8

9

6

7

R 39k

+12V

R 5k

R 10k

R 100k

13

14

1

2

13

14

1

LED 11

LED 22

LED 32

LED 44

LED 55

LED 66

LED 77

8/9/10

1µ

1N914

TP

TP

TP

TP

P 002

STIF

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Board Layout

C22µ

C 100pConnector

Ground

IC 1TL 072CP

+12 VGround-12 VSignal

IN

C .1µ

IC 3 LM 339N

C 1µ

R 470k

Potentiometer 5k(U ref. lower limit: 0.3 ... 0.8 V)

Potentiometer 10k(U ref. upper limit: 1.1 ... 2.1 V)

C22µ

Signal IN U sig.

IC 2 LM 339N

C .1µ

R 100k

R 100k

R 100k

R 100k

R 100k

R 39k

+12 V

LED 1

LED 2

LED 3

LED 4

LED 5

LED 6

LED 7

1 8AB

P 002

R 1.2k

LED

22n

Front Panel

LED: HLMP-0301 (red), HLMP-0401 (orange), HLMP-0501 (green)

STIF

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Connector Layout

Pin # Signal Name

1A n.u.1B VF - Signal IN

2 A+B n.u.3 A+B n.u.4 A+B -12 V5 A+B n.u.6 A+B Ground7 A+B Ground8 A+B +12 V

Remarks:For VF Signal IN =1.5 Vpp sinus the voltage at Uref will be approximately 1.5 Vdc (closelogarithmic transformation); may be plugged to P 12 (Synth. voice of the speech system) or P17 (Mic. input of the speech system);

Default Calibration (with 1 kHz sinus input signal):Module for P 12: Uref = 0.35 Vdc and Uref = 1.1 Vdc;

===> middle green LED on at Usig = 0.95 Vpp.Module for P 17: Uref = 0.15 Vdc and Uref = 0.6 Vdc;

===> middle green LED on at Usig = 0.55 Vpp.

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Appendix F - VF - Mixer Module

Schematic

R 10k

R 10k

IC 1TL 072CP

Signal OUT1

Signal Mic. IN

100p

6

5

+12V-12V

22µ 22µ

0.1µ0.1µ

8

4

7

R 22k*

R 22k*

R 22k*

1µ

1µ100p

2

3

Signal Synth. Voice IN

* 2% max.

R 100kTP

TP

TP

Remarks:The linearity was successful tested for the area from 500 Hz until 4.5 kHz. The noise level issmaller than 50 mV. The output signal has to respect the limits of the +12 V -12Valimentation.

Default Calibration (with 1 kHz sinus input signal):‘Signal Mic. IN’ = 0.7 Vpp ===> ‘Signal OUT’ =1.5 Vpp;‘Signal Synth. Voice IN’ / ‘Signal OUT’ = 1/1.

STIF

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Board Layout

C22µ

C .1µ

Connector

GroundSignal OUT

+12 VGround-12 VSignal Synth. Voice Signal Mic.

Signal OUT IN

C22µ

C .1µ

C 100p

C 1µ

R 22k

R 22k*

(Gain Mic. IN: 1 ...10)

(* Tolerance 2% max.)

IC 1TL 072CP

1 8AB

STIF

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Connector Layout

Pin # Signal Name

1A VF - Signal OUT (mixed from inputs)1B VF - Signal IN (from headset microphone)2A n.u.2 B VF - Signal IN (from synth. voice of the speech system)

3 A+B n.u.4 A+B -12 V5 A+B n.u.6 A+B Ground7 A+B Ground8 A+B +12 V

Remarks:Microphone input may be amplified (gain: 1...10); board connected to P 11;

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Appendix G - Motherboard

Schematic

ATCSimulator

SpeechSystem(RS 232)

Speech System ready ORPTT decoded

V

V

+12 V

SpeechDetector

SpeechDetector

JP 1

JP 2

JP 4

JP 5

1.2k

1k

1.2k

1.2k

1.8k 1.8k

3.3k 3.3k +8V-8V

1k

+12V

1µ 1µ

1µ

1µ

27k

1M+8V

-8V1M

1N914

1N914

P 01P 02

P 03

P 04

P 11

P 10

P 16

P 14

P 16

P 17

P 13P 12

1A

1A

1A

1A

1A

1AB

1AB

1B

1B

1B

1B

1B

2B

1A1B

3A

3B

2

3

4

5

A

B

5

6

1

1

3

2

3

4

5

6

11

12

21

20

23

24

17

22

19

18

1598

IC 1*

IC 1*

IC 1*

IC 1*

IC 2*

IC 2*

IC 2*

IC 2*

IC 6

IC 4

IC 4IC 4

IC 4

IC 5

IC 5

IC 5

IC 7

IC 7

IC 7

IC 8

IC 8

IC 8

IC 8

Spare

9 8

6

11 10

12

9 8

6

10

11

12

11

2 2

1313 4

33

4

55

IC 5

2 3

6 4/5

11

12/13

8

9/10

12/13

11

4/5 6

3

2

89/10

3

4

1

2

10

13

11

12

11

12/13

108/9

9

8

4

5/6

2

31

6 13

+12 V2

8

Relay

Mic.

Telephone

Radio

PTT

Headset

Mic.

Telephone

Radio

PTT A

PTT B

Mic.

Synth.Voice

SpeechSystem

PTT Synth. Voice

PTT

Tel. Speech

Radio Speech

Rx (RS 232 ATC Simulator) optional-12V Ground +12V

Rx (optional)

Mode 1/13

Mode 1/5

Mode sw

Mode sw

PTT

LED Channeloccupied

LED Speech SystemorPTT decoded (optional)

1k

2.2k1k 1k

2.2k

39k

10k

10k

+12 V

2

6Relay (opt.)

14

8

P 05

RelayChanneloccupied

IC 7

12

13

1

2

1k

* IC with +/-8V

STIF - Mode dependent status of the electronic switches on the motherboard

Electronic Switch(command pin nbr.)

ATC - P ATC - C Test

IC 1/6, IC 2/5+6+12 close close openIC 1/12, IC 2/13 open open close

IC 1/13 open close closeIC 1/5 close open open

STIF

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Board Layout

C22µ

IC 1HEF 4066BP

C 1µ

R 1.2k

D 1N914

IC 2HEF 4066BP

IC 6HEF 4025BP

IC 7MM 74C906

IC 4HEF 4011BP

IC 8SN 75188N

IC 5SN 75188N

RelayD31A5100

C 1µ

C22µ

D 1N914 R 1.2k

R 1.8k

JP 1 JP 2JP 5JP 4

1 1

1

1

1 1 1 1

1 1

1 1

P 02

P 03

P 04

P 10 P 11 P 12 P 13

P 14 P 15

P 16 P 17

P 01

1

25

A B

A BA B

A BA BA B

B A B AR 1.2k

R 10k

RelayD31A5100 (opt.)

P 051

R 2.2k

A B 1 6

STIF

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Connector Layouts

Connector P 01

Pin # Signal Name

1A+B Ground2A+B VF - microphone (ATC Simulator)3A+B VF - Telephone(ATC Simulator)4A+B VF - Radio(ATC Simulator)5A+B PTT A (ATC Simulator)6A+B PTT B (ATC Simulator)7A+B Ground8A+B -12 V9A+B +12V10A+B Ground11A+B VF - microphone (speech system)12A+B VF - synthetic Voice (speech system)13A+B Ground14A+B n.u.15A+B Rx IN (RS 232 ATC Com.Link Monitor for Speech Detection)16A+B Ground17A+B PTT Sw (local)18A+B n.u.19A+B speech system ready OR PTT Sw decoded (from Rx)20A+B PTT Sw Synth. Voice21A+B Spare22A+B Rx OUT (RS 232 ATC Com.Link Monitor for Speech Detection)23A+B Telephone speech detected24A+B Radio speech detected25A+B Ground

Connector P02 (Headset)

Pin # Signal Name

1 Ground2 VF - Microphone (+12 Vdc)3 VF - Telephone4 VF - Radio5 PTT

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Connector P03 (Front-Panel Switches)

Pin # Signal Name

A Mode IC 1 pin 13B Mode IC 1 pin 51 PTT Sw (+12V)2 Ground (PTT Sw)3 +8V (Mode Sw)4 -8 V (Mode Sw)5 Mode Sw6 Mode Sw (inverted)

Remark:The LED of the PTT switch is connected via P 04.

Connector P 04 (Front Panel LED’s)

Pin # Signal Name

1 LED Channel occupied2 +12 V3 LED speech system or PTT decoded (optional)

Connector P 05 (opt. ‘Relay Channel occupied’ for Speech System)

Pin # Signal Name

1 Relay Channel occupied (A)2 Relay Channel occupied (B)

Remark:This hardware switch represents the same ‘Speech Channel occupied’ information as the‘LED Channel occupied’ from connector P 04.

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Appendix H - Wiring List for Front-Panel

Lemo 10F Socket (Headset)

Pin # Signal Name wired to

1 VF - Radio P 02/42 Ground P 02/13 PTT P 02/54 Ground P 02/15 VF - Telephone P 02/36 Ground P 02/17 VF - Microphone (+12 Vdc) P 02/28 Ground P 02/1910

LED’s

Signal Name wired to

L 1 LED Channel occupied P 04/1+12 V P 04/2

L 2 LED speech system or PTT decoded (optional) P 04/3

Switches (S 01, S 02)

Signal Name wired to

S 01/1 PTT Sw (+12V) P 03/1S 01/2 Ground P 03/2

S 02/1+6+9 +8V (Mode Sw) P 03/3S 02/3+7+12 -8 V (Mode Sw) P 03/4

S 02/5 Mode Sw P 03/5S 02/11 Mode Sw (inverted) P 03/6S 02/2 Mode IC 1 pin 5 P 03/BS 02/8 Mode IC 1 pin 13 P 03/A

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Potentiometer (VF - Level Control)


n.c. Ground / Screen P 001/11 Resistor Side P 001/22 Resistor Middle P 001/33 Resistor Side P 001/4

Remark:Same connection for microphone- and synthesiser voice level.

Signal Level Display


1 LED1 (red -->low) P 002/12 LED2 (orange) P 002/23 LED3 (green) P 002/34 LED4(green -->normal) P 002/45 LED5(green) P 002/56 LED6(orange) P 002/6

7 LED7(red -->high) P 002/7

8,9,10 +12 Vdc P 002/8,9,10

Remark:Same connection for microphone- and synthesiser voice level display.

STIF

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Appendix I - Wiring List for Back-Panel

Lemo 10B Socket


1 VF - Radio P 01/4A+B2 Ground P 01/7 A+B3 PTT A P 01/5 A+B4 PTT B P 01/6 A+B5 VF - Telephone P 01/3 A+B6 Ground P 01/7 A+B7 VF - Microphone P 01/2 A+B8 Ground P 01/7 A+B910

Lemo 03 Socket (option: Version Lemo 05 Socket)


1 VF - microphone (speech system) P 01/11A+B2 VF - Synthetic Voice (speech system) P 01/12A+B3 Ground P 01/13 A+B

4 (opt.) Relay Channel occupied (A) P 05/15 (opt.) Relay Channel occupied (B) P 05/2

DB 25 Socket (RS 232 ATC Simulator Panel Link)


2 Rx IN (RS 232 ATC Com.Link Monitor for Speech Detection) P 01/15A+B3 n.u. P 01/14A+B7 Ground P 01/16A+B

STIF

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DB 09 Socket (RS 232 Speech System)


1 PTT Sw (local) P 01/21A+B2 n.u. P 01/22A+B3 Rx OUT (RS 232 ATC Com.Link Monitor for Speech Detection) P 01/18A+B4 PTT Sw Synth. Voice P 01/20A+B5 Ground P 01/25A+B6 Radio speech detected P 01/24A+B7 Speech system ready OR PTT Sw decoded (from Rx) P 01/19A+B8 Telephone speech detected P 01/23A+B9 Spare P 01/17A+B

S 03 Switch (Record/Replay)


1A Replay S 04/2A2A P 21/73A Record PTT Switch P 21/11B Replay PTT Switch P 21/22B P 21/73B Record S 04/2B

S 04 Switch (Mic./Radio)


1A Replay Microphone VF P 21/32A S 03/1A3A Replay Radio VF P 21/41B Record Microphone VF P 21/52B S 03/3B3B Record Radio VF P 21/6

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VF Cinch (Record VF)


1 VF Record (OUT) P 23/32 Ground P 23/1

VF Cinch (Record PTT)


1 Record PTT Switch P 22/32 Ground P 22/2

VF Cinch (Replay VF)


1 VF Replay (IN) P 23/22 Ground P 23/1

VF Cinch (Replay PTT)


1 Replay PTT Switch P 22/12 Ground P 22/2

STIF

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Appendix J - STIF - X 471 Wiring

1

2

3

4

5

6

7

8

9

10

8

21

22

9

7

20

12

25

LEMO 10 pinSTIF Rear Panel

DB 25FFrequentis X 471

STIF

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Appendix K - Voice Recording Interface

Schematic

-12 V+8 V

+12 V

+12 V

2Relay

14

86

10 11

12

13

2 1

8 9 10 11

6 12

4 3

5

2 1

13

9

10

8

5

4

6

13

12

11

2

3

470k1N914

470k

1N914

1N914

1N914

10k

10k

10k

10k

10k

4 x 240k

4 x 100k

4 x 22k

56k

68k5,6

8

9

22k

22k 10n

47k

0.1µ

0.1µ0.1µ 0.1µ

1µ

1µ

1µ470k

100k

27k

68k

IC 6*

IC 6*IC 6*

IC 6*

IC 7*

IC 7*

IC 7*

IC 4

IC 3IC 1

IC 2

IC 5

IC 5

IC 5

IC 5

Rear Panel

Record PTT Switch

Replay PTT Switch

P 22

3

1

P 10

P 23

P 21

1

7

2

1VF Replay (IN)

VF Record (OUT)

VF - SignalMic. (IN/OUT)

VF - SignalRadio (IN/OUT)

+12 V

Ground

-12 V

Detected PTTSwitch (IN)

Local PTTSwitch (IN/OUT)

1B

1A

3A

3B

-8 V

18k

33k

33k

18k

22µ

22µ

8A+B

4A+B

6A+B7A+B

Microphone

Radio

Replay

Record

S 03

S 04

2

3

81

4

22k

4.3k

47k

5 6

6

1,4,8,12

2

5

3,11,13,16

7

83

2

1,42,4,7,12

+12 V

15k

15k

15k

15k

1N914

IC 2

IC 2

+12V

10k

10k

+12V

14

11

98

10

+12V

* IC with +/-8V

Remarks:‘Record PTT Switch’ output signal (P22/3): 15 kHz square wave, 1.5 Vpp;‘Replay PTT Switch’ input signal (P22/1): 15 kHz, minimum 0.6 Vpp;Attention --> no signal at P22/1 or P22/3 means the PTT switch is pressed!!!

STIF

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Board Layout

C22µ

IC 6HEF 4066BP

IC 7HEF 4066BP

IC 1MC 14538

IC 2MM 74C906

C 1µ

C22µR 47k

RelayD31A5100

IC 5SN 751888N

IC 4TL 072CP

IC 3LM 311

R 22k

R 22k

R 22k

R 22k

R 470k

P 10

P 21

P 22

P 23

C 1µ D 1N914

D 1N914

D 1N914

R 470kR 10k

R 22k

R 47k

R 18k

R 4.3k1

1

1

R 22k

R 18k

R 10kR 470k

STIF

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Connector Layouts

Connector P 21 (Rear Panel Selector Switches)

Pin # Signal Name

1 Record PTT Switch2 Replay PTT Switch3 Replay Microphone VF4 Replay Radio VF5 Record Microphone VF6 Record Radio VF7 +12 V

Connector P 22 (VF Signals representing PTT Switch)

Pin # Signal Name

1 Replay PTT Switch2 Ground3 Record PTT Switch

Connector P 23 (Speech VF Signals)

Pin # Signal Name

1 VF Replay (IN)2 VF Record (OUT)3 Ground

STIF

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Connector P 10 (Motherboard)

Pin # Signal Name

1A VF Signal Radio (IN/OUT)1B VF - Signal Microphone (IN/OUT)

2 A+B n.u.3 A Local PTT Switch (IN/OUT)3B Detected PTT Switch (IN)

4 A+B -12 V5 A+B n.u.6 A+B Ground7 A+B Ground8 A+B +12 V

STIF

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Appendix L -RS 232 Speech System Signals

PinRS232SignalName

Signal Name“ACTIVE”Signal Level

1 DCD PTT Switch (local) high =>PTT Switch is pressed2 Tx n.u.3 Rx Rx OUT (RS 232 ATC Com.Link Monitor for Speech detection)4 DTR PTT Switch (from speech system for Synth. Voice Input) high =>Speech system ‘speaks’5 GRD Ground6 DSR Radio Speech detected by STIF high =>Speech on Radio Channel7 RTS Speech system ready or (optional) PTT Switch decoded (from Rx)high =>Speech system is ready8 CTS Telephone speech detected by STIF high =>Speech on Tel. Channel9 RI Spare

Remark:DB 9 socket on the rear panel.

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