SU720824A1 - Device for receiving polyfrequency signals - Google Patents

Description

(54) DEVICE FOR ACCEPTANCE OF MULTI-FREQUENCY SIGNALS

I

The invention relates to communication technology and is intended, in particular, to receive multi-frequency signals transmitted by tonal frequency currents with the code "2 of n" and convert them into signals suitable for control of switching equipment of electronic and quasi-electronic automatic telephone exchanges (ATS).

A device for receiving multi-frequency signals is known, comprising an input amplifier whose output is connected to n channels containing a series-connected band-pass filter, a threshold element and an integrator, as well as a series-connected memory block and an output valve (where n is the number of received signals as well as a code analysis unit, a delay unit, an output memory unit, and a rectifier unit, with the rectifier unit input connected to the input of the input amplifier, and the output of the rectifying unit connected to the second poro inputs gov elements 1.

However, the noise immunity of such a device when receiving signals with frequency-skewed levels is small.

The purpose of the invention is to improve the noise immunity of the device when receiving signals with frequency level skews.

The goal is achieved in that the device for receiving multi-frequency signals contains an input amplifier whose output is connected to n channels containing a serially connected bandpass filter, a threshold element and an integrator, as well as serially connected memory block and an output valve (where n is the number of received frequency), as well as a code analysis unit, a delay unit, an output memory unit, and a rectifier unit, the rectifier unit input connected to the output of the input amplifier, and the output rectifier unit

Claims (1)

the block is connected to the second inputs of the threshold elements, a voltage driver is inserted, and a modulo two adder is entered into each channel, the first input of which is connected to the corresponding input of the code analysis unit, the first input of the corresponding memory block and the integrator output, the second inputs of the blocks The memories are connected to the output of the delay unit and the first input of the output memory unit, W-V S-tii. A-WaJv,. „. .3 a dash of which is connected to the output of an 1S analogue code, and the second exits apt to find one of the second, which is found on the second page of the second, where it is; the memory block, and the outputs f (1pSh1t% of the voltage of the solenoid) are connected to the inputs of the threshold blocks. The structural electrical circuit of the device for multi-frequency signals is shown. The device contains the input amplifier 1, the output of which is parallel About the rectifier unit 2 is connected and the inputs of the section ...,. - .t c5t; 5 irt4 VSi - from a CBTr-C5TT - (Uyt from Channels, as soon as the bandpass filter 3 is turned on, threshold element 4, in the FET UT a Two-way comparator, integrator 5, adder 6, memory block 7, and OUTPUT valve 8. Second input: s threshold elements 4 and 1 with output of rectifier 1 block 2 and c; tO t1 one output output of the former 9 reference voltage. The first input of the memory block 7 and the first input of the adder are 6 pY% ODul1b DasbeDSUnY g v11KHODOM of the integrator 5, and the second HOUR of the adder 6 PODKLUCHN to the second output of the block 7 memory block 0 delay, the output of which is connected to the second inputs of blocks 7 tfsh t. The outputs of all the integrators 5 are connected to the inputs of the 11 eHaAtjSa block of the code with (they are connected to the tvry input of the output block 12 of the memory / Connected to the output of the delay unit 10. -..- .- The device operates as follows, the two currents of two Traetot from n, for example fi and f "., Are connected by the input amplifier 1 and through the half filters of the 3 corresponding channels are fed to one of the inputs threshold element 4 on sec e input threshold elements 4 supplied t) T5 HHbie smenheni voltage outputs from the respective driver 9 and the opornogonapry soyi eGmySh ustanav-livaets raZZhchM1G- -stvi 1% proc eed: 4g minutes Ana: L Og LLS kOmnetGatsii frequency skew damping trunks. From the output of threshold element 4 of the United States of America, signals are sent to the inputs of the integrator 5, where they are picked around 1) a: not. . ,, ,,. "..Y". . -l aljr - g. -1.l. "t-py -ft (j Video pulses from the outputs of the integrators 5 They enter the input accumulators by modulating two and the first inputs of the memory blocks 7, as well as the input of the II code analysis block Since the outputs of the adders 6 are connected to the input of the delay unit 10, the pulse 10 starts the delay unit 10 and, after a calibrated time interval, the information from the output of the unit 7 goes to the outputs of the output valves of the valves 8. If the information is received in a given code, then the output block 11 code analysis signal is missing and information signals return to the valve outputs 8. If the code analysis block 11 determines that the incoming information is transferred from the ZCG X to the T / in io ' v-rtiftirt i / niria ts psPArda MS B SaflaHHOM code, i.e., a current of one frequency or If more, pY-2, then in this case, a signal appears from the NU-output of the code AND analysis of the code; from the output of the output memory 12, the signal is fed to the LCD (to Jeanne of all the output valves 8. At the same time, this signal is set signal terminal “error. -, Since the TFY inputs of the threshold elements 4, besides the Ashray reference generator, are also connected to the output of the rectifier unit 2, as the input signal levels increase (with the Short connecting lines x), the output of the rectifier unit 2 increases, which, entering the Second inputs of the threshold elements 4, shifts the sensitivity thresholds in the direction of their increase. This allows you to maintain a constant working area of the Frequencies of each channel of the device in a wide dynamic range of input signal levels. The claims of the invention I.-..- ...... ,, g. A device for receiving multiple signals, comprising an input amplifier, the output of which is connected to p channels containing a series-connected band-pass filter, a threshold element and an integrator, as well as a series-connected memory block and output gate (where n is the number of received frequencies), as well as a block code analysis, delay unit, output memory unit and rectifier unit, the input of the rectifying unit being connected with the output of the input amplifier, and the output of the rectifying unit, Pod; Yuchen to the second input elements, characterized in that, in order to improve noise immunity when receiving signals with frequency level skews, a reference voltage driver is inserted, and a modulator two is entered into each channel, the first input of which is connected to the corresponding input of the code analysis unit, with the first input of the corresponding memory block and with the integrator output, the second inputs of the memory blocks are connected to you} with the delay block and the first input of the output memory block, the second input of which is connected to the output of the an There are aliz „crd, the second outputs of the memory blocks are connected to the second inputs of the corresponding modulo-two adders, the outputs of which are connected to the input of the delay unit, the second inputs of the output valves are connected to the output of the output storage unit, and the outputs of the reference voltage generator are connected to the second inputs threshold blocks. Sources of information taken into account in the examination 1. Austrian patent number 284917, cl. 21 AMO, 1970 (prototype).