SU1254594A1 - Device for reception of voice-frequency signals - Google Patents

Abstract

The invention relates to the Technique of wired communication on a compacted communication line and can be used for centralized control of the state of multi-purpose subscriber devices. The receiver noise immunity is increased when this signal is received. The device contains a amplifier-shaper 1 with a band-pass filter 2, an amplitude detector 3 and a threshold element 4, one-oscillators 6, 7, a storage device 8, a resistor 11, a diode 12, a capacitor 13, an inverter 17, a coincidence unit 19 and 20, execution units 21 , 24 and 25. The goal is achieved by the introduction of a differentiating chain 5, four drives 9, 10, 22, 23, three threshold elements 14-16, an inverter 18. 1 Il. § (/ WITH

Description

The invention relates to telecommunications, in particular, to a technique of wire communication over sealed lines of communication, and can be used for centralized monitoring of the state of multi-purpose subscriber devices.

The aim of the invention is to increase the receiver noise interference while receiving tones.

The drawing shows an electrical circuit of a tone receiver.

The device contains an amplifier-shaper 1 with a band-pass filter 2, an amplitude detector 3 and a threshold element 4, a differentiation circuit 5, the first odnivibrator 6, the second single vibrator 7, the first drive 8, the second drive 9, the third drive 10, resistor 11, diode 12, the capacitor 13, the first threshold element 14, the second threshold element 15, the third threshold element 16, the first inverter 17, the second inverter 18, the first block 19 matches, the second block 20 matches, the first execution unit 21, the fourth and fifth drives 22 and 23, respectively , sec second and third execution units 24 and 25, respectively.

The device works as follows.

Amplifier-shaper 1 amplifies, filters out a prohibitive filter 2 with the help of floor 35. It detects in amplitude with the help of amplitude detector 3 and normalizes in amplitude using tonal signal 4 of the threshold element 4. At the output of the amplifier-former 1, sequences of pulses are formed, which are then fed to the input of the differentiating circuit 5. The differentiated positive pulses trigger the first single vibrator 6, which forms relatively short negative pulses. These pulses arrive at the first inputs of the first 19 and second 20 blocks of coincidence and the trailing edge triggers the second one-shot 7 which generates relatively short negative pulses. These pulses are quickly discharged through the diode 12 to the capacitor 13 of the first, second and third connectors 8, 9 and 10, respectively, which are charged between the pulses through the resistor 11. When

five

In this case, the charging time of the capacitor 13 of the first accumulator 8 is longer than that of the second 9 and third tO drives. If the device receives tones with a repetition period sufficient to charge the capacitor 13 of the third accumulator 10 to ZFFovn the response of the third threshold element 16, but insufficient to charge the capacitor of the second storage device 9 to the level of the second threshold element 15 (for example, from tonal the buzzer-type signal Zanto), then the inhibitory potential from the third input of the second block 20 coincides. In this case, the pulses from the output of the first one-vibrator 6 begin to flow to the fifth drive 23, and upon receipt of a predetermined number of pulses, the third execution unit 25 is triggered.

If tonal dressings with a repetition period sufficient for charging the second capacitor 13, accumulator 9 to the second threshold element 15, but insufficient for charging the capacitor 13 of the storage device 8 to the first threshold elecant 14 (for example , from the buzzer-type tone signal; Call Control), then from the output of the second threshold element 15 to the second input of the second block

0

the potential, and the downstream potential from the third input of the first block 19 coincidence is removed. In this case, the pulses from the output of the first one-oscillator 6 begin to flow to the fourth drive 22, and upon receipt of a predetermined number of pulses, the second execution unit 24 is triggered.

If tonal dressings with a repetition period sufficient to trigger the first accumulator 8 and, respectively, the first threshold element 14 or continuous tones (for example, a signal of the buzzer type Ready for dialing) come to the device, then from the output of the threshold element 14 to the second the input of the first block of the 19 joint; b1eni enters the inhibitory potential. The same signal triggers the first execution unit 21.

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Claims (1)

Invention Formula A device for receiving tones, containing an amplifier-forming unit, two one-shot, two matching blocks, an inverter, a drive and three execution units, characterized in that a differential circuit, four drives, three thresholds, are introduced with a circuit to interfere with the reception of tonal signals. element and an inverter, with the output of the amplifier-maker connected to the input by the differentiation circuit, the output of the latter is connected to the input of the first single-vibrator, the output of which is connected to the first inputs of the first and volts the first block of matches and the input of the second one-shot, the output of which is connected to the inputs of three drives, the output of the first one is connected to the input of the first threshold element, the output 54594 .4 which is connected to the input of the first execution unit and the second input of the first matching unit, the output of the second accumulator is connected to the S input of the second threshold element, the output of which is connected to the second input of the second matching unit and the input of the first inverter whose output is connected to the third input of the first matching unit, the output of the third accumulator is connected to the input of the third threshold element, the output of which is connected to the input of the second inverter, the output of which is connected 15 to the third input of the second block, the match of the first block of the coincidence block is connected to the input of the fourth accumulator, the output of which is connected to the input of the second execution unit, and the output of the second coincidence block is connected to the input of the fifth accumulator, the output of which is connected to the input of the third executive block.