KR960010060Y1 - Automatic voice mute circuit at a phone call - Google Patents

Abstract

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Description

Automatic voice mute circuit on telephone call

1 is a circuit diagram of an automatic voice mute circuit during a telephone call according to the present invention.

* Explanation of symbols for main parts of the drawings

10: voice muting controller 20: muting signal generator

30: voice mute unit

The present invention relates to an automatic audio mute circuit of an audio output device such as a TV and an A / V device, and in particular, by connecting a telephone line to an audio output device such as a TV and an A / V device, The present invention relates to an automatic voice mute circuit in a telephone call to be muted automatically.

Currently, the sound output devices such as TVs and A / V devices are used early in remote control devices, that is, remote controllers that can control functions from a long distance. These remote controllers are used for TV and A / V devices. By sending various command signals to the remote control command receiver of the voice control button (UP / down) that can adjust the output voice of the TV or A / V equipment at the viewer or listener's intention, You can output the desired sound level by operating.

However, if a call comes in or needs to be called while watching or listening to a TV or A / V device. In order not to interfere with the call, the inconvenience of having to make a phone call after reducing or muting the output sound of the audio output device has been caused.

Accordingly, the present invention has been made in view of the above circumstances, and when a telephone call is made by connecting a sound output device such as a telephone line and a TV or an A / V device to automatically mute the output sound of the sound output device during a telephone call. It is an object of the present invention to provide an automatic voice mute circuit.

In order to achieve the above object, the automatic voice mute circuit during a telephone call according to the present invention is embedded in an audio output device such as a TV or an audio device, and is connected to a telephone line connected to a telephone to control voice muting according to a telephone call. A voice muting controller for outputting a signal, and a muting signal generator for generating a muting signal according to a control signal output from the voice muting controller. A muting unit for muting the output sound of the sound output device by the muting signal output from the muting knee generator.

In the automatic voice muting circuit according to the present invention configured as described above, the output level of the voice muting control unit becomes a low level during a telephone call, and the low level signal is applied to the voice muting unit so that the voice of the sound output device is automatically muted.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a circuit diagram of an automatic voice mute circuit during a telephone call according to the present invention, and reference numeral 10 denotes a flow of a call signal (Tip. Ring) applied to a telephone T from a telephone exchanger not shown when a telephone call signal arrives. A voice muting control unit which is connected to a subscriber line or trunk line and detects the level of on / off hook state of a hook switch of the telephone T and outputs a call detection signal for muting the output voice of the audio output device. The light emitting diode D1 as a light emitting element having an anode side connected through a tip signal line and a resistor R1 and a ring signal line and a cathode side connected among the call signals (Tip.Ring) applied through the subscriber line or the telephone line line. And an integrated circuit IC equipped with a phototransistor Q1 as a light receiving element whose conduction is determined according to the ON / OFF state of the light emitting diode D1.

In this case, the hook switch on / off state detection operation of the telephone T may be performed by generating 48V DC directly when the telephone line is put down and generating less than 10V DC when the receiver is lifted. .

20 is a muting signal generator for generating a muting signal according to the muting control signal of the voice muting control unit 10. The collector terminal and the base of the phototransistor Q1 of the voice muting control unit 10 are connected and the resistor R3. The power supply B + and the collector terminal are connected to each other, and the transistor Q2 is connected by one side of the collector terminal and one specific resistor R2 of the base terminal.

30 is a TV and A by the muting signal output from the muting signal generator 20 while the active low level muting terminal M is connected to the collector terminal of the transistor Q2 via a resistor R4. IC mute unit for muting output voice from an audio output device such as a / V device.

Referring to the operation of the automatic voice mute circuit during a telephone call according to the present invention configured as described above are as follows.

First, in a non-call mode (i.e., when the handset is put down) where a call signal (Tip.Ring) is not applied to a telephone T through a subscriber line or a telephone line from an unshown telephone exchange line, the voice muting control unit ( As the transistor Q1 in the transistor 10 becomes conductive, the transistor Q2 constituting the muting signal generator 20 becomes non-conductive, so that the mute terminal M of the voice muting unit 30 has a high level signal. Since it is applied, the voice muting unit 30 does not mute the output voice of the sound output device.

In other words, the voice muting unit 30 performs a muting operation only when a low level signal is applied to the muting terminal M. FIG.

In contrast, in the call mode, the light emitting diode D1 constituting the voice muting control unit 10 is turned off, the phototransistor Q1 is also turned off, and the transistor Q2 in the muting signal generator 20 is turned on. As it is in the state, the mute terminal M of the voice mute unit 30 goes low. Accordingly, the voice muting unit 30 mutes the output voice of the audio output device such as TB or A / V device.

On the other hand, according to the present invention, when the telephone call is terminated, the operation of the voice muting control unit 10 is stopped and the high level is applied to the voice muting unit 30 again. The mute operation of the output can be released.

As described above, according to the present invention, the telephone call state is detected by the call current flowing through the subscriber line or the telephone line of the telephone, and during the call, the output voice of the audio output device such as TV and A / V equipment is muted automatically. By not only preventing the interruption of the telephone call by the output voice output from the TV or A / V device, but also controlling the output voice of the TV and A / V device by artificially operating the voice control button of the remote controller. It can be much simpler.

Claims (1)

A voice muting control unit 10 embedded in a sound output device such as a TV or an audio device and connected to a telephone line connected to a line connected to a telephone to output a voice muting control signal according to whether a telephone call is made; A muting signal generator 20 generating a muting signal according to a control signal output from the voice muting control unit 10; Automatic muting circuit during a telephone call, characterized in that composed of a voice muting unit 30 to mute the output voice of the audio output device by the muting signal output from the muting signal generator (20).