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It is already mentioned voice switch is necessary

for the hands-free conversation. Here, we explain
the principle of the voice switch circuit used in the

EXES-6000 system. The voice switch circuit

mentioned here is an improved version of one

that is used in the EXES-5000 system.

The voice switch is employed in the DL unit and

its operations differ depending on the conversa-

tion mode (hands-free or handset) between the
stations.

Fig. 20 Block Diagram of Voice Switch

and Peripheral Circuit

— 19 —

III. VOICE SWITCH CIRCUIT

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Содержание EXES-6000

Страница 1: ...TOA EXES 6000 SYSTEM TOA Corporation KOBE JAPAN...

Страница 2: ...iptions of audio and dial signal flows that are a base of the system and the timing of their relative switches which are explained by using block diagrams of actual circuits The booklet is so compiled...

Страница 3: ...ce Switches 2 1 Voice Switch Features of Duplex Line Unit for the EXES 5000 the EXES 1000 and the EX 16 2 2 Voice Switch Features of Duplex Link Unit for the EXES 6000 IV PAGING SIGNAL FLOW 1 Paging S...

Страница 4: ...microphone are housed in a small case causing them to be located in close proximity to each other b Speaker audio output level is high c Microphone is very sensitive Fig 1 Hands free System 1 2 Voice...

Страница 5: ...s the crossbar method which corres ponds to space division method in the classifica tion of speech path The space division method is mentioned in the next section 2 3 This method however has both the...

Страница 6: ...hes in total b Time Division Method Fig 6 Time Division Method 8 lines 2 links The method adopted in the EXES 6000 system All stations are connected by one of each of transmitting and receiving bus li...

Страница 7: ...s having periodic intervals Fig 7 b the analog signal Fig 7 a is converted into such PAM signal as is shown in Fig 7 c However the real pulse intervals are so short that the spurious original analog s...

Страница 8: ...re eliminated through the lowpass filter 3 Through processes 1 and 2 the PAM signal is demodulated into such a waveform as is shown in Fig 9 3 which is identical with the original analog signal 3 4 Sa...

Страница 9: ...4 2 Access to Time Division Multiplex In Fig 11 a at the right hand side consider just how many lines are needed to transmit 4 different signals A B C and D to the outputs 1 2 3 and 4 respectively 1...

Страница 10: ...of analog switches x and y is sequenced in the following order When the analog switches x1 and y1 synchro nized with each other are on the signal A is allowed to go through to the output 1 and likewis...

Страница 11: ...ange Block Diagram 4 lines 2 links Shown below is the timing of each analog switch when a conversation is being made between stations A and C using LINK No 1 in the above Fig 13 Voice signal flow Mic...

Страница 12: ...pacitor in order to be demodulated into the original voice signal See section 3 3 Demodulation of PAM Signal Timing 2 3 Switches Tx3 and Ry3 close at this timing Marked in green in the Figs 13 and 14...

Страница 13: ...1 Voice Signal Flow Fig 15 Voice Signal Flow 10 II VOICE SIGNAL AND DIAL SIGNAL FLOWS...

Страница 14: ...R in EXES 6000 systems when the cross connection is made between Ty1 and Rx2 and between Ty2 and Rx1 because Rx2 stays open the voice signal does not pass through highway HW R and is held in the link...

Страница 15: ...to be generated in the dial pulse generator which The am is sent out to the LM unit of the exchange The dial streams are demodulated into the original pulses with a dial pulse detector in the LM unit...

Страница 16: ...ising 2 10 and in the above Figure and are 2 pulses enter inverted by a transistor They then pass through the dial data bus line and go into Input Port IP No 0 of the CP unit The CP unit is cyclically...

Страница 17: ...mory accord ing to the address specified by the OC unit Station numbers of the stations in converstations and the status of each link are written in the line memory of which contents become the contro...

Страница 18: ...15 Fig 19 Voice and Dial Signal Flows 16...

Страница 19: ...byword in synchronization with the link change over switches Ty1 Ty32 Rx1 Rx32 in the DL unit and controls the corres ponding time division switch in the LM unit according to the contents of the data...

Страница 20: ...202 are engaged in a conversation using link No 1 Table of Service Signal Tones 18 T R R T Duplex Calling tone Privacy tone Busy tone Dial tone Zone paging preannounce ment tone All call paging prean...

Страница 21: ...6000 system The voice switch circuit mentioned here is an improved version of one that is used in the EXES 5000 system The voice switch is employed in the DL unit and its operations differ depending...

Страница 22: ...ssion of the signal from mic A signal A to speaker B At the same time ATT B is activated and the signal from mic B attenuated by ATT B is trans mitted to the comparator In this event ATT A is not acti...

Страница 23: ...he voice signal is sent out from station B which is similarly transmitted to the DL unit 3 The 40Hz handset mode signal from station A preceeds to 40Hz SIGNAL DETECTOR A and its output level becomes h...

Страница 24: ...oice through a handset ear speaker In the case of the conversation mode used in this section a voice spoken into the mic of station A comes out of the speaker of station B But now that station B is in...

Страница 25: ...z SIGNAL DETECTOR B resulting in a high level output at the both detectors Similarly each of the both voice signals is transmitted to VOICE SWITCH A and B respectively via HPF The status of logic elem...

Страница 26: ...vel Subject to pulsive noise typewriter etc and unstable operation in conversation Acoustic feedback by echo or reverbration may cause the circuit to malfunction 2 2 Voice Switch Features of Duplex Li...

Страница 27: ...Stations To have the paging function in the EXES 6000 system use a PA amplifier and external speaker instead of station B in Fig 28 The PI unit is required as interface for this purpose Refer to Fig 2...

Страница 28: ...e using the station speakers In this event only one way speech path is formed from the paging station mic to the paged station speakers See Fig 30 Fig 30 Voice Signal Flow of Station Paging and Zone P...

Страница 29: ...P1 P7 through jumper wire JW and becomes an all call An incoming paging signal takes 2 separate courses at each zone output of the PI unit and one goes to each output section in the LM unit via an as...

Страница 30: ...from mic of station No 204 passes through Tx5 HW T Ty1 and is transmitted to link No 1 where it is held 2 Rx2 and Py0 close at the next timing and the voice that has been held passes through Rx2 HW R...

Страница 31: ...Fig 32 Zone Paging Signal Flow 29...

Страница 32: ...Fig 33 All Call Paging Signal Flow 30...

Страница 33: ...Fig 34 Station Paging Zone Assignment EX 630 31 32 2 Connection for Station Paging Group Paging...

Страница 34: ...nput of the SA unit needs to be connected to the first or last station number of the LM unit In this example the input PAGING No 1 is con nected to station No 200 PAGING No 2 to station No 207 and PAG...

Страница 35: ...Examplewhen One Station is in Conference Supposing station A alone is speaking the voice signal flows as follows Timing 1 Station A s mic HW T HPF Voice switch A Voice is held Timing 2 Mixing point B...

Страница 36: ...B to D are made L As a result voice switch A alone turns on and other voice switches B to D are off Consider another example where both stations A and D are speaking See Fig 37 2 Example when Two Stat...

Страница 37: ...8 Dial pulse stream generated in station No 200 is sent to the LM It is detected by the dial pulse detector in the LM and transmitted to the CP Station key number Pulse number The CP generates a pulse...

Страница 38: ...nd Ly1 close Link No 1 Rx2 HW R Ly1 Tl The PAM signal is demodulated into the analog voice signal in the Tl unit which passes through tie line link No 1 and flows to the data receiving audio signal tr...

Страница 39: ...EXCHANGE A No 200 327 EXCHANGE B No 470 597 38 39...

Страница 40: ...panel Calling party indicator panel lamp type When the called station having the indicator panel receives a call the calling station number is indicated by the lamp until the conversation is over or w...

Страница 41: ...nected in parallel per exchange It is possible to determine the channel number of the unit by setting the DIP switch on the PC board inside the unit See Fig 40 The function that corresponds with the c...

Страница 42: ...seconds Personal in and out registration can be accomplished at any Master station by using personal numbers max 100 IN OUT annunciations may be done Make output 100 contacts is available for pager co...

Страница 43: ...obtained Clear ope ration makes all 8 relays break Make output 100 contacts is available for pager control One contact out of 8 selectable make outputs is obtained for about 1 or 2 seconds 10 Selectab...

Страница 44: ...ontact out of 8 selectable make outputs is obtained Clear opera tion makes all 8 relays break 1 Make Break contacts can be available at any Master station 1 One shot make contacts can be avail able at...

Страница 45: ...Decimal Outputs are available with 7 segments LEDs One contact out of 8 selectable make outputs is obtained Clear ope ration makes all 8 relays break When a station with a Display Board is called call...

Страница 46: ...ing a case where all the 16 DR units have word 0 Since the output data function corresponding to each channel varies according to the CP unit to be used refer to the EXPLANATION OF DATA RECEIVING UNIT...

Страница 47: ...Fig 41 System Block Diagram of Data Transmitting and Receiving Units in CP 6 4 System 47...

Страница 48: ...elay OFF and 1 for relay ON The simplest way of controlling the indicator or controller by the content of the data is to directly connect between each 1 bit data and the device via a cable The total n...

Страница 49: ...start and the end data are added to the beginning and the end of the P E data respectively so that the DR unit may know the start and the end of data reception See of Fig 44 The P E data pulse is tran...

Страница 50: ...Fig 44 Contents of Data from CPU and Conversion Process into Transmitting Signal FSK 50...

Страница 51: ...If replacing the card still does not remedy the symptom try to find the other suspicious card by following the signal flow from the input through reference to the fore going sections of this booklet T...

Страница 52: ...mber 249 200 32 16 1 Note The lamp status is indicated by the binary code The lamp for station No 200 does not light 2 Service signal tones in Fig 45 SIGNAL CODE TONE AND SPEECH MODE During Conversati...

Страница 53: ...h the LINK BUSY lamps of the HC unit See Fig 46 d Check the voice distortion by actually making conversation e Terminate the conversation by depressing C button on the calling station f Follow the pro...

Страница 54: ...if this calling tone is distorted e Terminate the call by depressing C button on the calling station f Follow the procedures b to e for 16 times the total number of links by using the same stations In...

Страница 55: ...the exchange procedures written into the memory ROM and collates the data from stations for processing in succession CROSS BAR SWITCH A switch having a plurality of vertical paths a plurality of hori...

Страница 56: ...ltaneously Also called semi duplex transmission HC Highway Control Unit Turns on and off the time division switches at the LM DL and SG units according to instructions received from the CP unit The li...

Страница 57: ...as 1 and the change from positive to negative as 0 This method applies to data transmitting and receiving system in EXES 6000 system PI Paging Interface Unit Provides paging functions of PA paging and...

Страница 58: ...called Serial To Parallel Conversion SG Signal Generating and Distributing Unit Composed of 8 kinds of signal generators calling privacy disconnected busy dialing zone paging all call priority executi...

Страница 59: ...and each active input is associated with the desired output for a specific phase of the period VCO Voltage Controlled Oscillator A oscillator whose oscillating frequency is varied with applied voltage...

Страница 60: ...TOA Corporation KOBE JAPAN No 833 72 051 30 EGA09101100E Printed in Japan...

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