JPS61212151A - Telephone set provided with hand-free function - Google Patents

Abstract

PURPOSE:To use the titled telephone set by switching only a receiving voice from a loudspeaker monitor to a receiving call using an earphone in accordance with necessity at the time of a hand-free call, by providing a loudspeaker/ earphone changeover switch. CONSTITUTION:In case when an output voice level from a loudspeaker 7 is low, or a voice cannot be heard clearly due to noises of the periphery, etc., or in case when it is desired to set only a receiving voice to a privacy telephone, a loudspeaker/earphone changeover switch 6 is turned on, and a receiving sound signal is switched to an earphone 8. On the other hand, it is amplified by a microphone amplifying circuit 11, and thereafter, a level of a transmitting sound signal which has been rectified by a transmitting sound signal rectifying circuit 12 is compared with the receiving voice level by a voice level comparing circuit 3. As a result, in case when the transmitting voice level is higher than the receiving voice level, the transmitting voice connecting circuit 13 connects the microphone amplifying circuit 11 and a terminal 9, and the transmitting sound signal is sent out to a trunk line or a PBX line.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hands-free @ functional telephone, and when the operator of the telephone makes a hands-free call, the speaker/earphone changeover switch allows only the received voice to be transferred from the speaker monitor to the earphone. The present invention relates to a telephone with a hands-free function that can be used by switching to receiving calls.

[Conventional technology]

Conventionally, when a user of a telephone with a hands-free function makes a call, he or she uses a microphone and a speaker provided in the telephone.

With this Hazuki Vans 7R1 function equipped '11#1 model, when making a hands-free call, if the receiving sound level was low, it was possible to change the receiving sound level using the volume adjustment button, but even when the volume was set to maximum, the volume was still low. If the noise is low or the ambient noise is loud, -1! The disadvantage is that the hands-free function cannot be fully utilized because the only way to do so is to move closer to the machine's speaker or switch to a handset. Another disadvantage is that even if you do not want others to hear only the voice of the other party during a phone call, you cannot keep the conversation confidential as long as you continue to make a hands-free call using the microphone and speaker.

The object of the invention is to overcome the above-mentioned drawbacks.

[Structure of the invention]

According to the present invention, the PBX is
A telephone with a hands-free function that performs hands-free calls via a line or a central office line, including an earphone and a speaker/earphone changeover switch that connects a received voice signal output from a speaker amplifier circuit to the speaker or the earphone, To obtain a telephone with a hands-free function, which can be used in the summer by switching only the received voice from a speaker monitor to receiving a call through earphones as necessary during hands-free calls.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

When talking to a central office line or PBX line, the received audio signal is sent to terminal 1.
The signal is supplied to the received voice signal rectifier circuit 2 via. The received voice signal rectified by the received voice signal rectification circuit 2 is sent to the voice level comparison circuit 3, and the transmitted voice signal is amplified and rectified from the microphone 10 via the microphone amplifier circuit 11 and the transmitted voice signal rectification circuit 12. If the received voice level is higher, the terminal 1 and the speaker amplifier circuit 5 are connected by the received voice level w14.

Therefore, the received voice signal from the terminal 1 is amplified by the speaker amplifier circuit w15, and is outputted by the speaker 7 via the speaker/earphone changeover switch 6. If the output audio level from the speaker 7 is low or the audio is difficult to hear due to surrounding noise, or if you want to keep only the received audio confidential, set the speaker/earphone selector switch 6 to ONL to transfer the received audio signal to the earphone 8. Switch to. On the other hand, the level of the transmitting audio signal that has been amplified by the microphone amplifier circuit 11 and then rectified by the transmitting audio signal rectifying circuit 12 is compared with the receiving audio level by the audio level comparison circuit 3, and the transmitting audio level is set to the receiving audio level. If it is higher than .

A transmission audio connection circuit 13 connects the microamplifier circuit 11 and the terminal 9, and sends a transmission audio signal to the office line or PBX line.

〔Effect of the invention〕

As explained above, the present invention can be used to make a hands-free call using a Vans 7 Ri-1 function phone, if the received voice level is low or it is difficult to hear the received voice due to ambient noise, or if only the received voice is used as a private voice. When you don't want others to hear it, use the speaker/earphone switch to switch only the incoming audio from the speaker monitor to earphone receiving, allowing you to reliably hear the other party's voice, and also allowing you to make hands-free calls using the earphones. .

[Brief explanation of drawings]

The drawing is a block diagram of a hands-free telephone illustrating an embodiment of the present invention. 1.9...terminal, 2...receiver audio signal rectifier circuit, 3...audio level comparison circuit, 4...
...Reception audio connection circuit, 5...Speaker amplifier circuit, 6...Speaker/earphone selection switch, 7...Speaker, 8...Earphone , 10... Microphone, 11... Microphone amplifier circuit, 12... Transmission audio signal rectifier circuit. 13...Transmission audio connection circuit.

Claims (1)

[Claims] In a telephone with a hands-free function that uses a microphone and a speaker to make hands-free calls via a PBX line or a central office line, a speaker/earphone changeover switch connects an earphone and a received voice signal output from a speaker amplifier circuit to the speaker or the earphone. 1. A telephone with a hands-free function, characterized in that during a hands-free call, only the received voice is switched from a speaker monitor to an earphone to receive the call as necessary.