JPH10136100A - Conference telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide conference system in a place where there is no cable telephone facility by performing a conference when plural speakers mutually communicate with portable conference radio telephone units of each group through a radio telephone network. SOLUTION: A conference is performed when a group A that consists of plural speakers 14 and a groups B that consists of plural speakers 16, i.e., plural speakers 14 and 16, who are seated over their respective tables 15 and 17 mutually communicate through a radio telephone network 13 that is connected to a portable conference 3 radio telephone devices 12 which are provided with a simultaneously communicable loudspeaking and vice collecting means and an echo-canceling means through a radio channel. A portable radio telephone device which realizes a conference system by using logically one channel that uses a radio telephone network between remote location with plural persons at one location in the way and also where plural persons can use a mobile terminal that is used at one location is acquired.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conference telephone system, and more particularly, to a conference telephone system using a mobile terminal at a location without a wired telephone facility.

[0002]

2. Description of the Related Art A conventional conference telephone system using such a mobile terminal will be described with reference to the drawings.

FIG. 4 is a relay system diagram showing an example of a conventional conference telephone system using a mobile terminal.

In FIG. 4, this conventional example is disclosed in
No. 169236 discloses a mobile subscriber MB connected to a transceiver T / R0 of a radio base station BS via a radio line, and via a bidirectional trunk BWT0 via a communication line 101 of a network switch TSNW. It is in communication with the subscriber SUB-A connected to TRK0 and accommodated in another exchange. In this state, the mobile subscriber MB sets the connection number of the third party in the mobile device if the mobile subscriber MB has been provided with the provision of the call service with a third party other than the other party on the call. Transmits a connection request to a third party to the wireless base station BS via a wireless line. Radio base station controller CONT of radio base station BS
Receives the connection request to the third party and the connection number from the transceiver T / R0 during the call, and converts the connection request and the connection number to the third party via the signal line connected to the mobile switching center MTSO. In addition, the mobile switching center MT transmits the line number used by the mobile subscriber MB that has issued the connection request to the third party to the mobile switching center MT.
The data is transferred to the mobile subscriber control unit MCE of the SO. The mobile subscriber control unit MCE receiving the information transfer from the radio station control unit CONT converts the content of the information into an information form that can be processed by the central control unit CP, and then transfers the information to the central control unit CP. The central control unit CP is a mobile subscriber control unit MCE.
The vacant conference trunk CFT is captured based on the connection request to the third party requested by the mobile subscriber MB during the call received from the third party and the connection number information to the third party, and the third party can call and connect to the third party. Trunk line device TRK to connect to
1 and the signal sender SND are connected via the communication path 105, and a connection signal required for connection is transmitted from the signal sender SND at the subsequent position. Central controller CP terminates the transmission of the signal from signal sender SND and, when the connection is completed, releases communication path 105 and, by means of communication path 104, relay line apparatus TRK1 and conference trunk CF.
Connect to T. Subsequently, the central control unit CP opens the communication path 101 connecting the two-way trunk BWT0 and the trunk trunk TRK0 corresponding to the line used by the mobile subscriber MB for communication, and opens the two-way trunk BWT0 and the conference trunk CFT. Between the trunk line TRK0 and the conference trunk CFT.
3 to complete the three-party communication path by the conference trunk CFT. Here, a three-party call is taken as an example, but if a more independent connection is provided in the conference trunk CFT, a call with more subscribers can be completed.

[0005]

In the conventional conference telephone system using a mobile terminal, a mobile terminal is used as a mobile terminal with a portable radio telephone device used in an individual or in a car. Since the wireless telephone device is configured for one person to talk, it is suitable for a conference telephone system in which one person is located at one location and between multiple locations. Is not suitable. (Purpose) An object of the present invention is to realize a conference telephone system using a single logical line using a wireless telephone network between remote points by a plurality of persons at one point, and to use a mobile telephone at each point. It is an object of the present invention to provide a wireless telephone device in which a terminal can be used by a plurality of persons and can be carried.

[0006]

According to the present invention, there is provided a conference telephone system comprising: a loudspeaker / collector / means and an echo canceling means which enable a plurality of speakers of each of the plurality of groups to simultaneously talk to a plurality of groups. A plurality of speakers of each of the plurality of groups via a wireless telephone network connected to the portable conference wireless telephone device of each of the groups via a wireless line. A telephone conference can be performed by making a call with each other, and the portable conference wireless telephone device includes a portable conference auxiliary device,
A mobile phone including a voice input / output terminal for connection to the conference auxiliary device, the mobile telephone being capable of being used alone; the conference auxiliary device includes a first actuator as a voice loudspeaker; A first means for joining a vibrating plane as an auxiliary means and the first actuator;
, A second actuator as a means for performing echo cancellation, and a second auxiliary attachable to a second plane for joining the second actuator. A microphone for collecting sound, an echo canceling circuit for echo canceling by the microphone and the second actuator, and an input sensitivity of a sound output from the echo canceling circuit to the mobile phone. And a second amplifier circuit that raises the output level of the sound from the mobile phone as needed. The portable conference radio telephone device includes A mobile phone for housing the device in the same housing, wherein the mobile phone is in a state in which the auxiliary device for conference is stored and It can be used to separate location from the housing.

[0007]

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

FIG. 1 is a schematic diagram showing a conference telephone system using a mobile terminal according to an embodiment of the present invention, and FIG. 2 is a first view of a portable conference radio telephone apparatus used in this embodiment shown in FIG. FIG. 3 is a block diagram showing an embodiment.

In FIG. 1, in a conference telephone system using a mobile terminal according to the present embodiment, a group A having a plurality of speakers 14 and a group B having a plurality of speakers 15 are arranged on tables 15 and 17, respectively. Speakers 14, placed in
A portable conference radiotelephone device 12 including a loudspeaker, a sound collecting means, and an echo canceling means 16 capable of simultaneously talking;
A telephone conference is performed by making a telephone conversation with each other via a wireless telephone network 13 connected to the portable conference wireless telephone device 12 via a wireless line.

In FIG. 2, a portable conference radio communication device 12 used in the conference telephone system shown in FIG. 1 comprises a conference attachment device 10 and a portable telephone 11 which can be used alone. Output auxiliary terminal 9a
And an input auxiliary terminal 9b.

The conference auxiliary device 10 includes a voice loudspeaker actuator 1, an auxiliary device 2, 4, an echo canceling actuator 3, a microphone (microphone) 5, amplifier circuits 6, 8, and an echo canceling circuit 7. I have.

The voice loudspeaker actuator 1 is attached to a vibrating plane (a glass window, a door, a desk, a blackboard, a whiteboard, or the like) in a space where a telephone conference is held by an auxiliary device 2 that can be attached to a plane such as a desk. . Similarly, the echo canceling actuator 3 is mounted on a plane that can be vibrated by an auxiliary device 4 that can be mounted on a plane such as a desk.

The amplifier circuit 6 connects the input to the output auxiliary terminal 9a, amplifies the output signal from the portable telephone 11, and sends it to the voice amplification actuator.

The echo canceling circuit 7 receives an input from the microphone 5 and an input from the echo canceling actuator 3, and sends the input to the amplifier circuit 8. The amplifier circuit 8 sends the output to the mobile phone 11 via the auxiliary terminal 9b.

Next, the operation of the portable conference radio telephone apparatus according to the first embodiment will be described with reference to FIGS.

For example, voices emitted by a plurality of speakers 14 at the point of group A enter the echo cancellation circuit 7 together with the echo component from the microphone 5. The echo cancellation circuit 7 removes the echo component from the input voice and echoes it to the amplification circuit 8. Transmits the audio with the components removed. The amplifier circuit 8 amplifies the input voice to the volume level input by the mobile phone 11 and sends out the amplified voice to the mobile phone 11.

On the other hand, the sound from the point of the group B is operated by the amplifier circuit 6 from the output level of the portable telephone 11 via the auxiliary device 2 which is an auxiliary means for loudspeaker to actuate the actuator 1 which vibrates the vibrable plane. To a sufficient output level, and is sent to the actuator 1.
The actuator 1 vibrates a vibrating plane via an auxiliary device 2 which is an auxiliary means for loudspeaker, and the mobile phone 11
It provides an output that can be heard at a sufficient volume even for a person at a distance from the camera.

More specifically, when viewed from the device of the mobile phone 11, an output signal from the mobile phone 11 (an audio signal from the other party) comes out of the auxiliary terminal 9a, is amplified by the amplifier circuit 6, and is actuated by the actuator. Enter 1. The vibrable plane to which the actuator 1 is attached is vibrated by the actuator 1 via the auxiliary device 2, emits a sound wave in the air, and enters the human ear.

On the other hand, the voice uttered by the speaker 14 or 16 is
Collected by the microphone 5, but at the same time
Also collects the other party's voice uttered through the vibrating plane.

Therefore, the echo component is removed from the voice collected by the microphone 5 by using the echo canceling circuit 7. However, the voice generated by the actuator 1 differs from the original signal depending on the state of the vibrating plane. Using the echo canceling actuator 3, a signal containing the nature of the distortion of the vibrable plane is collected, and the collected signal is used as input data of the echo component to remove the echo component from the input signal from the microphone 5. Specifically, the signal obtained by inverting the phase of the input data of the echo component is combined with the input signal from the microphone 5 by increasing or decreasing the signal strength, and the signal obtained by filtering out the input data from the combined result and the original audio data signal are combined. By taking the difference, the echo component input data signal strength in the state where the echo component is the largest is determined. The difference between the echo component input data based on the signal strength and the audio signal is calculated,
This is an input signal from which the echo component has been removed. The input signal from which the echo component has been removed passes through an amplifier circuit 7 and an input auxiliary terminal 9.
b to the mobile phone 11.

FIG. 3 shows a second embodiment of the portable conference radio telephone apparatus used in the present embodiment shown in FIG.
Is a front view thereof, and (b) is a rear view thereof.

Referring to FIG. 3, in the portable conference radio telephone apparatus of the second embodiment, a voice loudness actuator 1a, an auxiliary device 2a attachable to a first plane, an echo canceling actuator 3, and a second plane are provided. The attachable auxiliary device 4a is incorporated in a portion of the back surface of the mobile phone 1a outside the plane occupied by the battery pack. Alternatively, auxiliary devices 2a, 4 that can be mounted on a plane with actuators 1a, 3a
a takes such a form that each can be detached from the mobile phone 11a and used.

The portable telephone device 11a is mounted on a vibrating plane (a glass window, a door, a desk, a blackboard, a whiteboard, or the like) in a space where a telephone conference is held, or
The actuator 1a removed from the mobile phone 11a,
Auxiliary devices 3a and 4a that can be attached to a plane 2a are used by attaching them to a plane that can be vibrated.

[0024]

As described above, the present invention includes a loudspeaker / sound collector / means and an echo canceling means in which a plurality of speakers in each of a plurality of groups can simultaneously talk in each of the plurality of groups. By providing a portable conference radio telephone device, a plurality of speakers in each of a plurality of groups can communicate with each other via a radio telephone network connected to each portable conference radio telephone device in each group via a wireless line. By performing the telephone conference, the following effects can be obtained.

The first effect is that a telephone conference system can be easily realized at a point where there is no wired telephone facility.

The reason for this is contradiction that the use of the voice amplification and sound collection means allows a plurality of persons to simultaneously obtain portability while obtaining an output that can be heard by the portable conference radio telephone device. This is because they have overcome the point.

The second effect is that hands-free and simultaneous transmission and reception can be performed without using an auxiliary device such as a headset.

The reason is that the portable conference radio telephone device
This is because there is provided an echo canceling unit for removing an echo component from the voice input from the sound collecting unit.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a conference telephone system using a mobile terminal according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a first example of the portable conference radio telephone device used in the present embodiment shown in FIG. 1;

FIGS. 3A and 3B show a second embodiment of the form radio telephone apparatus used in the present embodiment shown in FIG.
(B) is a back view thereof.

FIG. 4 is a relay system diagram showing an example of a conventional conference telephone system using a mobile terminal.

[Explanation of symbols]

 Reference Signs List 1, 1a Voice amplification actuator 2a, 4a Auxiliary device 3, 3a Echo cancellation actuator 5, 5a Microphone (microphone) 6, 8 Amplification circuit 7 Echo cancellation circuit 9a Output auxiliary terminal 9b Input auxiliary terminal 10 Auxiliary device for conference 11, 11a mobile telephone 12 portable conference wireless telephone device 13 wireless telephone network 14,16 speaker 15,17 table

Claims (3)

[Claims] 1. A portable conference radio telephone device including a loudspeaker / sound collector / means and an echo canceler capable of simultaneously communicating with a plurality of speakers of each of the plurality of groups in each of the plurality of groups. A telephone conference can be performed by making a call between the plurality of speakers in each of the plurality of groups via a wireless telephone network connected to the portable conference wireless telephone device of each of the groups via a wireless line. A conference telephone system, characterized in that: 2. The portable conference radio telephone device includes a portable conference accessory device and a mobile phone including a voice input / output terminal for connection to the conference accessory device, which can be used alone. The conferencing device can be attached to a first actuator as a voice loudspeaker, and a first plane for joining a vibrating plane, which is an auxiliary means for loudspeaker, and the first actuator. A first auxiliary device, a second actuator as a means for performing echo cancellation, a second auxiliary device attachable to a second plane for joining the second actuator, and a sound collection device. A microphone for sound, an echo canceling circuit for echo canceling by the microphone and the second actuator, and an echo canceling circuit for the mobile phone. The bring optionally the input sensitivity of the sound output from the Le circuit 1
2. The conference telephone system according to claim 1, further comprising a built-in amplifier circuit and a second amplifier circuit that raises the output level of audio from the mobile phone as needed. 3. The portable conference radiotelephone device comprises a mobile phone for accommodating the auxiliary device for conference in the same housing, wherein the mobile phone is in a state in which the auxiliary device for conference is stored and for the conference. 3. The conference telephone system according to claim 1, wherein an attached device can be used separately from said housing.