SU1177950A1 - Multichannel intercom - Google Patents

Description

The invention relates to telecommunications, in particular to systems for implementing two-way loud-speaking communication, and can be used in service systems.

The aim of the invention is to increase the bandwidth of the communication line.

The drawing shows a structural electrical diagram of a multi-channel intercom.

The multichannel device contains a central unit consisting of a ring switch 1, an encoder 2, the first element OR 3, a register '4, a decoder 5, a block 6 keys ,, the call block 7, the first key 8, a resistor 9, a power source 10, a capacitor 11, switch 12, analog-to-digital converter '.13, second element OR 14, element 15, second key 16, loudspeaker 17, amplifier 18 and executive unit 19, as well as N subscriber units 20, each of which contains a capacitor 21, loudspeaker 22 and the first, second and third chains, each of otorrhea includes respective key 23-25 and 26-28 corresponding resistor.

Multi-channel intercom works as follows ..

When you press one of the buttons installed on the front doors of a residential building, the contact of one of the switches of the ring switch 1 closes and a logical "1" appears on one of the inputs of the encoder 2 and the element OR 3, which passes to the output of the first element OR 3, and The output of the encoder 2 appears binary code corresponding to the apartment number, the corresponding button which was pressed.

The calling block 7 is switched on and by the first impulse it enters the number of the called apartment in register 4. The decoder 5 includes one of the keys of block 6, which corresponds to the number of the apartment called. Since at this time the first key 8 is turned on, the signal of the call block 7 through this and one of the public keys of block 6 enters one of the subscriber blocks 20, where through the capacitor 21

arrives at the loudspeaker 22, which emits a ringing tone, since the frequency of the calling unit 7 lies in the sound range.

The tenant of the apartment in response to this signal turns on the keys 23 and 24 and thus supplies the input of the analog-digital converter (ADC) 13 with such a voltage, in response to which at its output the code "10" is formed.

This turns on the second key 16, and the switch 12 is set in a position in which the pin 1 is connected to pin III and pin II to pin IV. The loudspeaker 22. is used as a microphone in the apartment and is connected through capacitors 21 and 11 and switch 12 to the input, amplifier 18, the output of which is through switch 12 and the second key 16 is connected to loud! Speaker 17, mounted on the front doors.

When disconnections, the key 24, the voltage at the input of the ADC 13 rises and at its output the code becomes "01", which is. switches the switch 12. At the same time, the loudspeaker 17 and the second switch 16 are connected to the input of the amplifier 18 through the switch 12, and the output of the amplifier 18 through the switch 12, the capacitor 11, one of the public keys of the unit 6 and the capacitor 21 is connected to the loudspeaker 22. Thus when the key 24 is turned on, the sound is transmitted from the apartment 1 selected to one of the switches to the loudspeaker 17, and when disconnected from the loudspeaker 17, which serves as the microphone of the front door to the loudspeaker 22 of the chosen apartment. conducting bilateral negotiations between the tenant of the apartment and the visitor who chose this apartment by pressing the button on the front doors, the tenant can turn on switch 25. At the same time, the voltage at the input of the ADC 13 becomes almost zero, and at its output the code becomes "11", which causes the element to trigger an And 15. and the inclusion of the mechanism of the executive block 19 opening the lock on the front door of the house.

1177950

Claims (1)

A MULTI-CHANNEL NEGOTIATION DEVICE containing a central unit consisting of an amplifier, a loudspeaker, a call switch, a call unit and a power source and N subscriber units consisting of loudspeakers, the N outputs of the central unit being connected to the inputs of the corresponding N subscriber units, characterized in that in order to increase the capacity of the communication line, serially connected encoder, the inputs of which are connected to the corresponding outputs of the call switch, are entered into the central unit; mp, and the block decoder key, whose N outputs are the N outputs of the central unit, serially connected first OR gate, a first a key and an analog-to-digital converter, an AND series and an execution unit connected in series, a second OR element and a second key connected in series, as well as a resistor, a capacitor and a switch, the first output of which is connected to the first output of the capacitor, the second output of which is connected to the output of the first switch , the combined N information inputs of the key block and the first output of the resistor, the second output of which is connected to the output of the power source, the first and second outputs of the analog-to-digital converter connection s with pairwise combined inputs of the element And the second element OR, the second output of the analog-digital converter connected to the control input of the switch, the second output of which is connected to the information input of the second key, the amplifier is turned on between the third and fourth terminals of the switch OR , the inputs of which are connected to the corresponding inputs of the encoder, is connected to the input of the call block, the output of which is connected to the information input of the first key and the control input of the register, while ιin each of the N subscriber units, three parallel circuits are introduced from a series-connected corresponding key and a corresponding resistor, as well as a condensate circuit, with a circuit of series-connected capacitors and a loudspeaker connected in parallel to the first circuit, the output of which is the input of the subscriber unit. with In and* m m ate about 1177950