Prefix with caller ID for radiotelephone and mini-ATS. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Prefix with caller ID for radiotelephone and mini-ATS. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Telephony

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Now on sale there are phones and set-top boxes with caller ID for every taste. However, some users are not satisfied with existing designs. We are talking about the owners of radiotelephones and subscribers of office mini-ATS. With this in mind, the Telesystems company has developed a prefix that communicates information about the number of the caller by voice over the telephone line.

The prefix is included in the telephone line break. When the caller ID system is triggered, the caller receives a ringback control signal, and the set-top box outputs a voice message about the caller's number. This message can be heard when you pick up the handset on any of the phones connected after the set-top box. Thus, from any telephone device (radio telephone, regular telephone, fax, etc.) connected after the set-top box, you can get information about the number of the caller.

Radiotelephone users will find it convenient to receive information there. where they are with the tube. When working with a mini-automatic telephone exchange, it is necessary to install a prefix on each city line. As a result, any internal subscriber will be able to receive information about the caller's number. The use of ordinary caller IDs as internal phones does not give the desired result, since in most cases it is not possible to coordinate the operation of a mini-PBX and a telephone with caller ID.

(click to enlarge)

When there is an incoming call after picking up the handset (in the auto-pick up mode, the line is seized automatically after the specified number of rings) on any telephone or radiotelephone, the set-top box reports the number of the caller. If you want to talk to him, then you need to press the button on the phone, and when not, just hang up. While reporting the number, the caller hears a ring back tone (long beeps).

The set-top box has an internal non-volatile memory for 100 calls, where the caller's number, time and date of the call are stored. Management is carried out from the phone keypad.

The diagram of the device is shown in the figure. The basis of the set-top box is the PIC1C16 PIC73C2 controller from Microchip. The ZQ32 quartz resonator generates the main clock frequency, and the 768 Hz signal (set by ZQ1) is used to count the time and periodically "wake up" the controller from the "sleep" state. Voice messages are stored in ROM DD3. The ROM address generator is assembled on two shift registers (DD4, DD5). Chip non-volatile flash memory DD2 is used to store information in memory voiced.

Transistor VT1 implements a generator of a request signal and a ring back signal (SND). The signal from the telephone line for analyzing the ANI message is sent to the ADC of the controller (signal SIG). The use of the ADC made it possible to achieve a high probability of determining the number. The ringer sensor is assembled on resistors R13. R14. and the line status sensor - on R7, R8.

Key K2 opens when auto-raising (UP signal). Capacitor C5 serves to prevent the passage of a voice message to the caller (in this case, the key K1 is opened by the CUP signal). Through the transistor VT3, an audio signal (LSD) of a voice message about the number of the caller enters the line (pulse-width modulation is applied).

The set-top box is powered by a telephone line through a resistor R4 and from a buffer power supply (GB1) with a voltage of 4,5 V (three AA elements). It is assembled in a compact case measuring 100x60x35 mm.

PC controller firmware.

Authors: A. Glazkov, I. Korshun, Zelenograd

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