SU122175A2 - Sound calling device of the telephone set - Google Patents

Description

BASIC Auth. St. N ° 106827 described the sonic ringing device of the telephone set of the central or local battery system, containing a local semiconductor converter of direct or alternating current into the current of the tone frequency supplied to EzrySafe alarm device, for example, a siren.

The present additional invention simplifies the execution of a call signal generator and a low frequency amplifier. This is achieved by using one semiconductor triode in the ringer circuit instead of two and corresponding switching.

When the microtelephone tube is hung, the semiconductor triode is used in a tone-frequency oscillator circuit with inductive coupling, activated when a call arrives, and when the tube is picked up, the same triode is included in the frequency amplification circuit and the chuck audio frequency amplifier works.

FIG. 1 shows a diagram of the device with a call subscriber alternating current; in fig. 2 is a diagram of the device with the call of the subscriber by a constant GOKOM from the central battery of the telephone exchange.

Microphone; when using both circuits, it is fed through a low (about 100–200 ohm) resistance 2.

When the tube is hung, the amplifier is turned into an SOUND generator.

In this case, the contact springs 3 and 4 of the lever of the apparatus are in the lower position, the winding 5 of the transformer is connected in series with the capacitor 6, and the resistance 2 is disconnected from the microzone /.

No. 122175-2 The alternating current, with a frequency of 25-50 Hz, coming from the telephone exchange, is rectified by a bridge consisting of diodes 7, 8, 9 and 10, smoothed by a capacitor and is used to power the generator.

During the call, the microphone is short-circuited, and the circuit shunting the additional resistance 12 is open.

An alternating sound voltage is applied to the telephone 13, which ensures the receipt of a sound signal.

By appropriate selection of the capacitor 6 and the resistance 12 on the telephone 13 it is easy to get the sound voltage of any frequency within 400-3000 Hz, reaching 5-6 in the attenuation of the subscriber line, exceeding 1 nap.

Instead of an additional winding 5, wound on a transformer of a telephone, you can use a winding 14 or 15, which do not participate in the call circuit by providing additional commutation by means of the lever of the apparatus.

A dial tone can be made by a direct current received from the central battery of the telephone exchange (Fig. 2).

During the conversation, the contact spring 3 is in the upper position.

Since the diode 16 transmits a current of the order of 20 ma and more, it practically does not resist the talk current.

When the tube is hung, the contact spring 3 is in the lower position, and the semiconductor triode operates in the tone generator circuit.

In this case, the input resistance of the apparatus increases sharply, since the shunt short-circuiting the additional resistance 12 is broken, and the resistance 2 is turned off.

The current consumed by the device in the call mode depends on the desired volume of the call and when the voltage of the sound vibrations supplied to the phone is on the order of 5-6 V is about 7 mA.

When the tube is lifted, winding 5 is turned on, and additional resistance 12 is shorted, resulting in a low-resistance holding circuit, which includes a microphone / and resistance 2.

The station is called by the subscriber either by closing the springs of the dialer 17 in the PBX systems (Fig. 1) or by closing the call button 18 manually in the RTS circuit (Fig. 2).

The circuit shown in FIG. 2, allows control of the operation of the called subscriber's ringing generator, for which a third of the transformer winding 19 remains turned on when both the riser and the hung-up tube are turned on.

Through the third winding 19 of the transformer, a tone signal comes from the sound generator of the called subscriber’s apparatus.

At the same time, this signal makes it possible to monitor the health of the subscriber line.

For operation of the device without call control, it is necessary to provide for the disconnection of the transformer winding 19 with a hung tube.

Subject invention

Sound ringing device of the telephone set of the central or local battery system according to aut. St. No. 106827, characterized in that, in order to simplify the device that generates

call signal and low-frequency gain, one semiconductor triode is applied, with a hanging tube connected in a generator circuit with inductive coupling, and with a picked up tube switched on in a low frequency gain circuit.