JP4125815B2 - Handset hookdown sound suppression device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmitter / receiver hook-down sound suppressing device, and more particularly to a transmitter / receiver hook-down sound suppressing device that prevents a listener from hearing an annoying sound that occurs when a transmitter and a receiver are hit by a hook-down.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, this type of transmitter / receiver hook-down sound suppressing device is shown in FIG. FIG. 2A is a conceptual diagram of the structure of a handset and a handset receiver. The handset 21 includes a handset 21 of a speaker and a hook switch 23 attached to the handset receiver 22, and the handset 21 includes a microphone. 24 is attached. FIG. 2B is a block diagram, in which the microphone 24 on the transmitting side is connected to the audio signal amplifying circuit 25 via the hook switch 23, and the output of the audio signal amplifying circuit 25 is the receiving device of the telephone apparatus on the receiving side. Connected to. The receiving device on the receiving side includes a receiver signal amplifying circuit 26 and a receiver 28 of a handset 27 connected to the receiver signal amplifying circuit 26 or a speaker 29.
[0003]
In such a transmitter / receiver hook-down sound suppression device, when the speaker lifts the transmitter / receiver 21 on the transmitter side from the transmitter / receiver receiver 22, the hook switch 23 is closed, and a conversation with the receiver side becomes possible. When voice is input from the microphone 24, the voice signal is converted into an electric signal, amplified by the voice signal amplifier circuit 25, and input to the receiver signal amplifier circuit 26 on the receiving side. The input audio signal is amplified before it can be heard as sound from the speaker 29 or the receiver 28. In order for the speaker to end the call, when the transmitter 21 is returned to the transmitter receiver 22, the hook switch 23 is opened and the call with the receiver is ended.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional communication device, the call is not finished until the handset is lowered to the handset receiver and the hook switch is turned off. For this reason, before the call was disconnected by the hook switch, the sound generated when the handset and the handset were hit was transmitted to the receiver or speaker on the receiving side, and the receiving side heard it harshly.
[0005]
The present invention has been made to eliminate the above-mentioned conventional drawbacks, and is a transmitter / receiver that prevents the receiver from hearing the annoying sound that occurs when the transmitter / receiver / receiver strikes before the hook switch is turned off. An object of the present invention is to provide a hook-down sound suppressing device.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the handset hookdown sound suppression device of the present invention hooks up a handset from the handset receiver, and when the speaker inputs voice from the handset microphone, the speaker's speaker or handset A communication device capable of transmitting voice to a receiver, which is attached to a transmitter / receiver receiver of a speaker and includes an impact sensor for detecting a hook down of the transmitter / receiver, and a mute transistor that is turned on / off by a sensor signal of the impact sensor And an audio signal amplifying circuit in which the audio input from the microphone is muted by the mute transistor.
[0007]
According to this handset hookdown sound suppression device, the mute circuit is operated by the sensor signal detected by the impact sensor that hits the handset and the handset receiver, and the hit sound is transmitted from the microphone to the audio signal amplification circuit. Without being heard from the receiver or speaker of the other party.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a handset hookdown sound suppressing device according to the present invention will be described below with reference to the drawings.
[0009]
FIG. 1A shows a conceptual diagram of the structure of a handset and a handset receiver. The handset 1, a handset receiver 2 for receiving the handset 1, and the handset receiver 2 include an impact sensor 3 and a hook switch. 14 is attached. FIG. 1B is a block diagram, and the impact sensor 3 is connected to a sensor signal processing / mute circuit. The sensor signal processing / mute circuit 3 includes a sensor signal amplification circuit 4, a sensor signal detection circuit 5 including a comparator 16 and a comparator 17, a rectifier circuit 6 including two diodes 18 and a capacitor 19, and a mute transistor 7. The mute transistor 7 is connected between the microphone 8 of the handset 1 and the audio signal amplifier circuit 9. The output of the audio signal amplification circuit 9 is connected to the reception circuit of the other communication device. The receiving circuit includes a receiver signal amplifying circuit 10 and a receiver 12 or a speaker 13 of the handset 11.
[0010]
The operation of the handset hookdown sound suppressing apparatus according to the present invention will be described below. In a state where the speaker is holding the transmitter / receiver 1 in his / her hand and performing voice transmission, the transmitter / receiver 1 is placed in the receiver / receiver receiver 2 when the speaker ends the transmission. At the moment of placing, the impact sensor 3 attached to the handset receiver 2 generates a voltage due to the vibration of the handset 1 being placed. The generated voltage is amplified by the sensor signal amplification circuit 4 and output to the sensor signal detection circuit 5. The sensor signal may be output on the positive side or the negative side depending on the position where the handset 1 hits the handset receiver 2. When the sensor signal input to the sensor signal detection circuit 5 has a voltage higher than the positive sensor signal set, the comparator 16 detects the signal and outputs the voltage to the rectifier circuit 6. When the negative sensor signal becomes a voltage higher than the set voltage, the comparator 17 detects the signal and outputs the voltage to the rectifier circuit 6. Thereby, a sensor signal can be detected no matter what position the handset 1 hits the handset receiver 2. The output voltage from the sensor signal detection circuit 5 is a pulse output at the moment when the handset 1 hits the handset receiver 2, and the audio signal cannot be muted for a certain time. Therefore, in order to mute the audio signal for a certain time, the diode 18 and the capacitor 19 of the rectifier circuit 6 convert the sound signal into an output signal having a certain time width, and the mute transistor 7 is operated. When the mute transistor 7 operates, the hookdown sound from the microphone 8 is not transmitted to the audio signal amplifier circuit 9. As a result, the listener does not hear an annoying sound at the end of the transmission.
[0011]
【The invention's effect】
As is clear from the above description, according to the handset hook-down sound suppressing device according to the present invention, the talker is unaware of anything and does not let the talker hear the annoying sound generated when placing the handset. Can end the story.
[Brief description of the drawings]
FIG. 1A is a conceptual diagram showing a structure of a handset hookdown sound suppressing device according to the present invention.
(B) is a block diagram showing an embodiment of a handset hookdown sound suppressing device according to the present invention.
FIG. 2A is a conceptual diagram showing a configuration of a conventional handset hookdown sound suppressing device.
(B) is a block diagram showing a conventional handset hookdown sound suppression device
1 ・ ・ Handset (sending side)
2 .. Handset receiver 3 .. Shock sensor 7 .. Mute transistor 8 .. Microphone 9 .. Audio signal amplifier circuit 11 .. Handset (receiver side)
12 .. Receiver 13 .. Speaker

Claims (1)

A telephone device capable of hooking up a handset from a handset receiver and transmitting a voice to a speaker of the handset or a receiver of the handset when a speaker inputs voice from the microphone of the handset, A shock sensor for detecting a hook-down that is attached to the transmitter / receiver receiver of the speaker and generates a voltage generated by vibration of the transmitter / receiver being hooked down as a sensor signal; In order to obtain a time width output signal, a sensor signal detection circuit for detecting whether the voltage of the sensor signal is equal to or higher than a predetermined value, and an impact sound input from the microphone is not transmitted to the audio signal amplification circuit. A transmitter / receiver hook-down sound suppressing device comprising a mute transistor that is turned on / off based on the output signal.

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