SU1282353A1 - Telephone set - Google Patents

Abstract

The invention provides the ability to receive a ringing signal when the handset is not placed (MTT). If MTT is laid carelessly or not at all, the telephone signal is received by the telephone set. This signal passes through a narrowband filter 7,,. A smart rectifier 8 and charges the storage capacitor 9. After some time, the voltage on the storage capacitor 9 reaches the threshold of the threshold element 1 1. In this case, a voltage is applied to the winding 12 of the electromechanical relay. The relay will work, contacts 13, 14 are closed in the ringing unit 1 and open the subscriber line of communication with the talker unit 2. Zanto signal will be removed. When a signal arrives Call the calling unit I, whose circuit is closed by the closing contact 13 of the electromechanical relay, will play a ringing tone. In order to make a telephone conversation, the subscriber must put in and remove MTT again so that the contacts 45 of the lever switch 3 establish the necessary connections. 1 il. (Ls

Description

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The invention relates to telephony and can be used for telephone communication in networks of automatic telephone exchanges.

The purpose of the invention is to provide the possibility of receiving a ringing signal when the handset is not placed.

The drawing shows the functional diagram of the telephone.

The telephone set contains a calling unit 1, a conversational unit 2 with a handset, a lever switch 3 with a closing contact 4 and a disconnecting contact 5, a dialer 6, a narrowband filter 7, a valve rectifier 8, a storage capacitor 9, a discharge resistor 10, a bipolar threshold element 1, a winding 12 of an electromechanical relay with two stable states, with a closing contact 13 and a breaking contact 14

The telephone works in the following way.

When a signal arrives Calling from the handset of the handset lying on the device, the calling unit 1 plays a ringing tone, since the circuit of the calling unit 1 is closed by the disconnecting contact 5 of the lever switch 3. The called subscriber picks up the handset and contacts 4 and 5 of the lever switch 3 open the calling circuit unit 1 and close the circuit of the conversational unit 2, connect it to the line. If at the end of the call, the subscriber put the handset on the device, then the telephone

ready to receive a call again signal I

If the called subscriber forgot to hang up at the end of the conversation, and the other party put the phone down, then the Zan signal will start coming from the station to the telephone set with an unused microtelephone handset. This signal passes to the input of a narrowband filter 7, tuned to the frequency of the specified signal. The output signal of the narrowband filter 7 is rectified by the rectifier 8. The charging time of the capacitor 9 is such that after some predetermined time, the voltage on the capacitor 9 will reach the threshold of the threshold element 1, which will cause a voltage to be applied to the winding

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12 electromechanical relays. The relay operates, and its contacts 13 and 14 are closed in the ringing unit 1 and the communication circuit of the subscriber line with the talker unit 2 is opened. Thus, the call will be released if the subscriber forgot to hang up the handset on the device or put it inaccurately.

After removing the signal from the telephone station, the contact group of the electromechanical relay will remain in the same state, since this state is stable. The telephone station of the subscriber of the PBX will again be ready to receive a call Upon receipt of this signal, the calling unit 1, the circuit of which is closed by the closing contact 13 of the electromechanical relay, will play the ring signal. In order to carry out a telephone conversation, the called subscriber must hang up and pick up the telephone receiver again. In this case, the lever switch 3 transfers the contact group of the electromechanical relay to its previous steady state due to the mechanical connection between them.

In order to prevent premature automated disconnection, the parameters of the charge and discharge circuit of the capacitor 9 are chosen to be from. the battle took place through relatively

5 large reception time from the signal station Zan what will ensure the insensitivity of the device in real time intervals to the signals of the station response and control of the call quality, having the same frequency with the zan signal.

Thus, the telephone creates additional convenience as it provides the ability to call

 subscriber both at the position and at the position of the handset.

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Claims (1)

Invention Formula A telephone set containing a pushbutton unit, a talker unit with a handset, a lever switch, the closing contact of which is connected in series with the first input of the subscriber line, and the break contact connected between the second input of the subscriber line and the second input of the crawler unit, the first the input of which is connected to the first input of the subscriber line, and the dialer, the first input of which is connected to the second input of the subscriber line, the second input to the first input of the conversational unit, and the third input to the second input of the conversational unit the possibility of a call signal primer when the handset is not placed, a narrow-band filter is introduced, the inputs of which are connected in parallel to the inputs of the talker unit, and connected in series between the two outputs of the narrow-band filter straightened A capacitive valve and a storage capacitor, and a discharge resistor and a circuit of a series-connected bipolar threshold element and a winding of an electromechanical relay with two stable states, the contact group of which is mechanically connected with a lever switch, the contact contact of the contact group is connected in parallel, parallel to the storage capacitor a breaker breaker contact, and its breaker contact is connected between a breaker-breaker contact Tel H nepBbw input conversational unit.