SU372733A1 - DEVICE FOR IDENTIFICATION OF CALLING NUMBER - Google Patents

Description

one:

The invention relates to information processing devices and can be used in quasi-automatic telephone exchanges.

Caller number identification devices are known, comprising a ring unit, a unit for inputting information about scanned points, a decoder, an integrating unit and a control unit.

However, in known devices, the coupling of the outputs of the device with the outputs of the collecting circuit and the load is difficult due to the lack of isolation.

The proposed device provides isolation between the outputs of the decoder and the load due to the fact that an additional integrating unit is connected to the inverse outputs of one of the triggers of the ring unit, and the outputs of both integrating units are connected via a two-input collective circuit to the control unit.

The drawing shows a block diagram of the proposed device.

The device contains an annular block /, a decoder 2, a block 3 for entering information about scanned points 4i-4, a main and additional integrating blocks 5i and 5, a controlling block 6 and a two-input collecting circuit 7. The block / is made on the 8, 9, 10 triggers matching schemes 11–16, and descrambler 2 — on matching schemes 17–22. If there are no calls at the scanned points 4i-4b (call is “zero, no call is“ one ”), the ring block / generates with a natural frequency, since“ units through the collective circuits 23-28 of block 3 arrive at the outputs of the coincidence circuits 11-16, what causes the sequential switching of the triggers 8-10. Pr | And this, at the outputs of the matching circuits 17-22, there appear short parasitic pulses, the duration of which is determined by the switching time of neighboring triggers, to the outputs of which

These circuits are connected. Triggers 8-10 in the generation mode are switched quite frequently, and at their output v, there are also short parasitic pulses, the duration of which, unlike pulses

at the outputs of the decoder 2, it is longer and is determined by the time between the successive switching of any trigenera during the single bypass period. Integrating blocks 5i and Sz do not transmit these parasitic pulses to the input

control unit c.

When a call ("zero") appears at any of the 4i-4s points, the scanner stops at the position corresponding to the calling point number. It means that

the triggers 8-10 remain in the same position, and the trigger 10, the outputs of which are connected to the integrating blocks 5 and 52, will stop either in the state “O-I” or in the state “1-o”, which is determined by which of the scanned points appears call. Since the call information for the integrator 2 is only one (or only zero), it is necessary to remove the information in inverse form, i.e., from both arms of the trigger. For example, when a call arrives at point 4, the triggers 8-10 stop at the state of, respectively, "O-1," O-1 "1-O, i.e., zero is removed from the right output of trigger 10, and from the left, “Unit to inputs of integrating units. Block 5i will accept a single signal from the left shoulder of the trigger 10, and block 5 will not accept a zero signal from the right shoulder of the trigger 10 as a challenge.

In another case, when a call is present, for example, at point 4i, the 8-W triggers stop at the state "O-1," O-1, and "O-1, respectively. In this case, from the left shoulder of the trigger 10 is fed to the input of the block 5i zero

29 i Schn

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signal, and from the right shoulder - a single one. Block 5i does not respond to the zero signal, and block 52 perceives a single signal from trigger W as a call. So the block

5, block 52 senses a ringing signal in the event that the generation of the ring block is stopped}.

In this way, the outputs 29-34 of the decoder are connected to the inputs of the collecting circuit 7 and the load.

Subject invention

A device for identifying a caller number comprising a ring

block, block of input of information about scanned points, decoder, integrating unit and control unit, characterized in that, in order to provide isolation between the outputs of the decoder and the load, to the inverse outputs of one of the triggers of the ring unit an additional integrating unit is connected, and the outputs of both the integrating units are connected via a two-input collective circuit to the control unit.