JPH05207124A - Loud-speaker calling device - Google Patents

Abstract

PURPOSE:To perform a calling with an excellent clearness even under a circumstance such as noise, etc., by switching a loud calling mode to a one-side calling mode from a position which is away from a housing body by a press-to-talk button provided on a wireless terminal. CONSTITUTION:E/O conversion circuits 25, 26 converting a rising sound signal to be outputted from a microphone 21 and a press-to-talk signal by a press-to- talk button 23 into an optical signal are provided on a wireless terminal BQ. By providing O/E conversion circuits 10, 11 converting the optical signal converted in the E/O conversion circuit into the rising sound signal and the press-to-talk signal and a calling mode switch circuit 9 on a fixed terminal AQ, a loud speaker calling mode by a loud-speaker microhpone 2 and a speaker 1 of the fixed terminal is switched to a one-side calling mode by the rising sound signal converted by the O/E conversion circuit in accordance with the press-to-talk signal converted in the O/E conversion circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice communication device,
In particular, the press talk button provided on the wireless terminal can switch the loudspeaker call mode by the loudspeaker microphone and speaker of the fixed terminal to which the downlink transmission line is connected to the one-side call mode by the uplink voice signal generated by the microphone of the wireless terminal. The present invention relates to a voice communication device.

[0002]

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION
As shown in FIG. 2, the public address telephone device TE ₂ has a speaker 31,
It is composed of a loudspeaker microphone 32, a speaker amplifier 33, a microphone amplifier 34, a voice switch circuit 35, a communication interface 36, a tuning button 38, a tuning control circuit 37, and a press talk button 39. The upstream transmission line L ₂ and the downstream transmission line L ₁ are connected.
Further, a channel selection button 38 is connected to the channel selection control side of the communication interface 36 via a channel selection control circuit 37, and a press talk button 39 is connected to the extension side of the voice switch circuit 3.
5 is connected. The amplifier side of the voice switch circuit 35 is connected with a microphone amplifier 34 and a speaker amplifier 33 whose gains of upstream and downstream voice signals are controlled by a predetermined algorithm of the voice switch circuit 35. Loudspeaker microphone 32 is used for speaker amplifier 33.
And the speaker 31 are respectively connected.

When making a call from the public address communication device TE _{2 having the} above-mentioned configuration, the other party's number is entered in the channel selection button 38. The tuning control circuit 37 sends out tuning control information to the upstream transmission line L ₂ via the communication interface 36 based on the information of the other party's number by the tuning button 38, and waits for the other party's response to switch to the voice communication mode. Become. Further, in the case of an incoming call, an incoming signal is input from the downlink transmission line L ₁ to the communication interface 36, so that the voice switch circuit 35 operates and the incoming signal is sent from the speaker 31 via the speaker amplifier 33. When the channel selection button 38 is operated, a response signal is sent from the channel selection control circuit 37 to the up transmission line L ₂ via the communication interface 36, so that the call is in the voice communication mode. In the voice call mode, the gains of the upstream and downstream voice signals are controlled by a predetermined algorithm of the voice switch circuit 35, the upstream voice signal is fed by the loud microphone 32 and the microphone amplifier 34, and the downlink voice signal is fed by the speaker 31 and the speaker amplifier. At 33, each is converted into an acoustic / electrical signal.

Here, since a part of the downlink audio signal reproduced by the speaker 31 is returned to the loudspeaker microphone 32 as an acoustic feedback signal, a howling state occurs when the amount of feedback is large. In order to prevent this howling state, the gain of one amplifier prioritized by a predetermined algorithm of the audio switch circuit 35 is increased, and the gain of the other amplifier is attenuated so that the speaker amplifier 33 is increased. And the mutual gain of the microphone amplifier 34 are adjusted.

Further, when the call in the voice call mode is disturbed by the ambient noise and the call cannot proceed smoothly, the press talk button 39 is pressed. When the press talk button 39 is pressed, the call is switched to the one-side call mode, the gain of the speaker amplifier 33 is forcibly attenuated, the downlink voice signal is cut off, and only the uplink voice signal is transmitted. When the press talk button 39 is returned, the one-sided call with only the downlink audio signal is made, and the amplifier 33 for the speaker in which the gain of the downlink audio signal is increased
It is transmitted from the speaker 31 via the.

If the press talk button 39 is not operated for a certain period of time, the one-side call mode is switched to the loud call mode. In the loudspeaker telephone system TE _{2 having the} above configuration, since the press talk button 39 is mounted in the housing of the loudspeaker telephone system TE ₂ together with the speaker 31 and the loudspeaker microphone 32, the sound due to the up and down voice signals is located at a position away from the housing. However, when the call in the loud call mode is disturbed by the ambient noise, the call is immediately switched to the one-side call mode, and the one-way call with only the up voice signal and the down voice signal by the speaker 31 are performed at a position away from the housing. There is a problem that only one-sided calls cannot be made.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and by switching the voice call mode to the one-side call mode from a position away from the housing by a press talk button provided on a wireless terminal, noise such as noise can be reduced. It is an object of the present invention to provide a loudspeaker communication device that enables a call with high clarity even in an environment.

[0008]

In order to achieve the above object, a loudspeaker apparatus according to the present invention is an E / O which converts an up voice signal output from a microphone and a press talk signal from a press talk button into an optical signal. The wireless terminal provided with the converting means, the O / E converting means for converting the optical signal converted by the E / O converting means of the wireless terminal into the upstream voice signal and the press talk signal, and the O / E converting means In response to the press talk signal, a call mode switching means for switching the voice call mode by the voice microphone and speaker of the fixed terminal to which the up and down transmission lines are connected to the one-way call mode by the up voice signal converted by the O / E conversion means. It has and.

[0009]

The upstream audio signal output from the microphone and the press talk signal from the press talk button are converted into an optical signal by the E / O conversion circuit provided in the wireless terminal. This O / O provided in the fixed terminal to which the optical signal is transmitted in the upstream and the downstream are connected.
The E conversion circuit converts the voice signal to the up voice signal and the press talk signal, and activates the call mode switching circuit according to the press talk signal to change the voice call mode by the voice microphone and speaker of the fixed terminal to the one-way call using the voice signal for the up and down voices. Switch to mode.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a voice communication device according to the present invention will be described in detail below with reference to FIG. Loudspeaker telephone terminal T according to the present invention
As shown in FIG. 1, E ₁ is a speaker 1, a loudspeaker microphone 2,
Speaker amplifier 3, microphone amplifier 4, voice switch circuit 5, communication interface 6, tuning button 8, tuning control circuit 7, press talk circuit 9, light receiving element 10, light receiving element amplifier 11, FM demodulation circuit 12, Fixed terminal AQ having FM carrier detection circuit 13 and call mode selector switch 14, wireless microphone 21, FM modulation circuit 2
2, press talk button 23, press talk switch 24,
The wireless terminal BQ includes a light emitting element drive circuit 25 and a light emitting element 26, and an upstream transmission line L ₂ and a downstream transmission line L ₁ are connected to the outside line side of the communication interface 6. A channel selection button 8 is connected to the channel selection control side of the communication interface 6 via a channel selection control circuit 7, and an audio switch circuit 5 to which the output side of the press talk circuit 9 is connected is connected to the extension side. .. The amplifier side of the voice switch circuit 5 is connected to a microphone amplifier 4 and a speaker amplifier 3 whose gains of upstream and downstream voice signals are controlled by a predetermined algorithm of the voice switch circuit 5, and are connected to the microphone amplifier 4 and A loudspeaker microphone 2 and a speaker 1 are included in the speaker amplifier 3.
Are connected respectively. The light receiving element 10 that receives the light emitted from the light emitting element 26 of the wireless terminal BQ is connected to the input side of the light receiving element amplifier 11, and the output side of the light receiving element amplifier 11 is the FM demodulation circuit 12 and the FM carrier detection circuit 13. Connected to the input side of. Further, the FM demodulation circuit 12
And the output side of the loudspeaker 2 are connected to the voice signal input terminals 14b and 14a of the call mode changeover switch 14, respectively, and the voice signal output terminal 14c of the call mode changeover switch 14 outputs the voice through the microphone amplifier 4. It is connected to the amplifier side of the switch circuit 5. Further, the output side of the FM carrier detection circuit 13 is connected to the control side of the call mode changeover switch 14 and the input side of the prestalk circuit 9.

The wireless microphone 21 of the wireless terminal BQ has a press talk button 23 via the FM modulation circuit 22.
Is connected to one signal input side of the press talk switch 24, and the other signal output of the press talk switch 24 is connected to the light emitting element 26 via the light emitting element drive circuit 25. Outgoing loudspeaker telephone device TE ₁ having the above configuration, the party number registered number, call and response operations loudspeaker telephone device TE ₂
When the call mode selector switch 14 is in the voice call mode, the speaker 1 and the voice microphone 2 are active because the voice signal input terminal 14a and the voice signal output terminal 14c are connected.

Press talk button 23 of wireless terminal BQ
When is pressed, the wireless microphone 21 becomes active, the upstream audio signal is modulated by the FM modulation circuit 22, and the modulated upstream audio signal is sent to the light emitting element 26 via the light emitting element drive circuit 25. The light emitting element 26 emits light according to the modulated upstream audio signal and sends this light to the light receiving element 10 of the fixed terminal AQ. The light received by the light receiving element 10 is sent to the FM demodulation circuit 12 via the light receiving element amplifier 11 to be demodulated, and sent to the voice signal input terminal 14b of the call mode switch 14. On the other hand, the carrier wave contained in the received light is detected by the FM carrier detection circuit 13 to which the light receiving element amplifier 11 is connected, and this carrier wave is used as a press talk signal on the input side of the press talk circuit 9 and the call mode selector switch 14. Sent to the control side of. The call mode selector switch 14 operates under the control of the press talk signal, and the voice signal input terminal 14b and the voice signal output terminal 14c.
Are connected. As a result, the loudspeaker microphone 2 is switched to the wireless microphone 21 of the wireless terminal BQ. Further, since the press talk circuit 9 operates, the voice switch circuit 5 is switched from the control according to the predetermined algorithm to the control according to the one-side call mode, and the operation according to the pressing and returning operation of the press talk button 39 in the loudspeaker telephone device TE ₂ is performed. Become.

The modulation format in the above embodiment is not limited to FM modulation, and other modulation formats such as AM modulation may be used.

[0014]

The loudspeaker communication device according to the present invention can switch the loudspeaker call mode to the one-sided call mode from a position away from the housing by the press talk button provided on the wireless terminal, so that even in an environment such as noise. You can make calls with high clarity.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a voice communication device according to the present invention.

FIG. 2 is a block diagram of a conventional voice communication device.

[Explanation of symbols]

1-Speaker 2-Speaker microphone 10-Light receiving element 10 (O / E conversion means) 11-Amplifier for light-receiving element (O / E conversion) Means) 9 ... Press talk circuit (call mode switching means) 14 ... Call mode switching switch (call mode switching means) 21..Wireless microphone 23 .. ..Press talk button 25..Light emitting element drive circuit (E / O conversion means) 26 ........ Light emitting element (E / O conversion means) AQ ........ Fixed terminal BQ .. ... Wireless terminals

Claims (1)

[Claims] 1. A wireless terminal provided with an E / O conversion means for converting an upstream audio signal output from a microphone and a press talk signal by a press talk button into an optical signal, and an E / O conversion means of the wireless terminal. An O / E conversion means for converting the received optical signal into an upstream voice signal and a press talk signal, and a fixed terminal to which upstream and downstream transmission lines are connected according to the press talk signal converted by the O / E conversion means. A loudspeaker communication device comprising: a loudspeaker microphone and a loudspeaker conversation mode for switching to a one-sided speech mode by the upstream voice signal converted by the O / E converter.