Conference telephone system

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a conference telephone system, and more particularly to a conference telephone system that uses a mobile terminal at a point where there is no wired telephone equipment.

【0002】

[Conventional technology]

A conference telephone system using this type of conventional mobile terminal will be described with reference to the drawings.

【0003】

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

【0004】

In FIG. 4, this conventional example shows the disclosure contents of JP-A-59-169236, in which the mobile subscriber MB is connected to the transceiver T / R0 of the wireless base station BS via a wireless line, and the bidirectional trunk BWT0. It is connected to the relay line device TRK0 by the communication path 101 of the network switch TSNW and is in a call state with the subscriber SUB-A housed in another exchange. In this state, if the mobile subscriber MB is a mobile subscriber who is given the provision of a call service with a third party other than the other party during the call, set the connection number of the third party on the mobile device. Sends a connection request to a third party to the wireless base station BS via a wireless line. When the radio base station controller CONT of the radio base station BS receives a connection request and a connection number to a third party from the transceiver T / R0 during a call, it receives a connection request and a connection number from the transceiver T / R0 during a call via a signal line connected to the mobile exchange station MTSO. In addition to the connection request and connection number to the third party, the line number used for the call by the mobile subscriber MB who issued the connection request to the third party is used as the mobile subscriber control device of the mobile exchange station MTSO. Transfer to MCE. The mobile subscriber control device MCE, which receives the information transfer from the radio station control device CONT, converts the content of the information into an information form that can be processed by the central control device CP, and then transfers the information to the central control device CP. The central controller CP uses the conference trunk CFT that is vacant by the connection request to the third party and the connection number information to the third party requested by the mobile subscriber MB during the call received from the mobile subscriber controller MCE. In order to capture and call a third party to connect to the other party, the relay line device TRK1 and the signal sender SND are connected by the communication path 105, and the connection signal required for the connection is transmitted from the signal sender SND at the rear. When the central controller CP finishes transmitting the signal from the signal sender SND and the connection is completed, the communication path 105 is opened, and the communication path 104 connects the relay line device TRK1 and the conference trunk CFT. Subsequently, the central controller CP opens the communication path 101 connecting the bidirectional trunk BWT0 and the relay line trunk TRK0 corresponding to the line used by the mobile subscriber MB for the call, and bidirectionally. The three-way communication path by the conference trunk CFT is completed by connecting the rank BWT0 and the conference trunk CFT by the communication path 102 and the relay line trunk TRK0 and the conference trunk CFT by the communication path 103. Here, a three-way call is taken as an example, but if a more independent connection path is provided in the conference trunk CFT, a call path with more subscribers can be completed.

【0005】

[Problems to be Solved by the Invention]

In the conference telephone system using this conventional mobile terminal, the mobile terminal is used as a portable wireless telephone device used by an individual or in a car, but in general, one person talks on the portable wireless telephone device. It is suitable for a conference telephone system with one person at one point and between multiple bases, but there is a problem that it is not suitable for a conference system with multiple people at one point and between multiple bases. .. (Purpose) An object of the present invention is to realize a conference telephone system by using a single line logically using a radiotelephone network between remote points by a plurality of people at one point, and to move a telephone system to be used at each point. The purpose is to provide a radiotelephone device that can be used by a plurality of people and can be carried.

【0006】

[Means for solving problems]

The conference telephone system of the present invention includes a portable conference telephone device including a loudspeaker / sound collecting / means and an echo canceling means capable of simultaneously speaking by a plurality of speakers of the plurality of groups in each of the plurality of groups. , A telephone by making a call to each other of the 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 by a wireless line. The portable conference wireless telephone device can hold a conference, and includes a portable conference accessory device and a mobile phone that includes an audio input / output terminal for connecting to the conference accessory device and can be used alone. The conference attachment can be attached to a first actuator as a voice loudspeaker and a first plane for joining a vibrable plane and the first actuator, which are auxiliary means for loudspeaking. A first auxiliary device, a second actuator as a means for canceling echoes, a second auxiliary device that can be attached to a second plane for joining the second actuator, and a sound collecting sound. A first echo canceling circuit that echo cancels by the microphone and the second actuator, and a first that raises the input sensitivity of the voice output from the echo canceling circuit to the mobile phone as needed. The amplification circuit and the second amplification circuit that raises the output level of the voice from the mobile phone as needed are built-in, and the portable conference wireless telephone device has the conference accessory device in the same housing. A mobile telephone for accommodating is provided, and the mobile telephone can be used in a state in which the accessory device for conference is stored and the accessory device for conference is separated from the housing.

【0007】

BEST MODE FOR CARRYING OUT THE INVENTION

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

【0008】

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 embodiment of a portable conference telephone device used for the embodiment shown in FIG. It is a block diagram which shows.

【0009】

In FIG. 1, in the conference call system using the mobile terminal of the present embodiment, group A having a plurality of speakers 14 and group B having a plurality of speakers 15 are placed on tables 15 and 17, respectively. A portable conference radiotelephone device 12 equipped with loudspeaker, sound collecting means, and echo canceling means capable of allowing a plurality of speakers 14 and 16 to talk simultaneously, and a radiotelephone network connected to the portable conference radiotelephone device 12 by a wireless line. A conference call is made by talking to each other via 13.

【0010】

In FIG. 2, the portable conference wireless activation device 12 used in the conference telephone system shown in FIG. 1 is composed of a conference accessory device 10 and a mobile phone 11 that can be used independently, and is an output provided in the mobile phone 11. They are connected to each other by auxiliary terminals 9a and input auxiliary terminals 9b.

【0011】

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

【0012】

The voice loudspeaker actuator 1 is attached to a vibrable flat surface (glass window, door, desk, blackboard, whiteboard, etc.) in the space where a conference call is held by an auxiliary device 2 that can be attached to a flat surface such as a desk. Similarly, the echo canceling actuator 3 is also attached to a vibrating flat surface by an auxiliary device 4 that can be attached to a flat surface such as a desk.

【0013】

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

【0014】

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

【0015】

Next, the operation of the portable conference wireless telephone device of the first embodiment will be described with reference to FIGS. 1 and 2.

【0016】

For example, the voice emitted by the multiple speakers 14 at the point of group A enters the echo cancel circuit 7 together with the echo component from the microphone 5. The echo cancel circuit 7 removes the echo component from the input voice and the echo component has been removed by the amplifier circuit 8. Send out the voice of. The amplifier circuit 8 amplifies the input voice to the volume level input by the mobile phone 11 and sends it to the mobile phone 11.

【0017】

On the other hand, the sound from the point of group B is sufficient to operate the actuator 1 that vibrates the vibrable plane from the output level of the mobile phone 11 in the amplifier circuit 6 via the auxiliary device 2 which is an auxiliary means for loudspeaking. It is amplified to a high output level and sent to the actuator 1. The actuator 1 vibrates a vibrable flat surface via an auxiliary device 2 which is an auxiliary means for loudspeaking, and outputs a sufficient volume so that even a person who is relatively far from the mobile phone 11 can hear it.

【0018】

More specifically, when viewed from the device of the mobile phone 11, the output signal from the mobile phone 11 (audio signal from the other party) is output from the auxiliary terminal 9a, amplified by the amplifier circuit 6, and enters the actuator 1. .. The vibrable flat surface to which the actuator 1 is attached is vibrated by the actuator 1 via the auxiliary device 2, and emits sound waves into the air to enter the human ear.

【0019】

On the other hand, the voice emitted by the speaker 14 or 16 is collected by the microphone 5, but at the same time, the voice of the other party emitted through the plane on which the actuator 1 can vibrate is also collected.

【0020】

Therefore, the echo canceling circuit 7 is used to remove the echo component from the sound collected by the microphone 5, but the sound emitted by the actuator 1 is distorted from the original signal differently depending on the state of the vibrating plane, so echo canceling is performed. The actuator 3 is used to collect a signal including the distortion property of a vibrable plane, and this is used as the input data of the echo component to remove the echo component from the input signal from the microphone 5. Specifically, the input data phase-inverted of the echo component is combined with the input signal from the microphone 5 by increasing or decreasing the signal strength, and the input data is filtered out from the combined result and the original audio data signal. The difference is taken to determine the echo component input data signal strength in the state where the echo component is the largest. The difference between the echo component input data based on this signal strength and the audio signal is taken to obtain an input signal from which the echo component has been removed. The input signal from which the echo component has been removed is sent to the mobile phone 11 via the amplifier circuit 7 and the input auxiliary terminal 9b.

【0021】

FIG. 3 shows a second embodiment of the portable conference radiotelephone device used in the present embodiment shown in FIG. 1, in which FIG. 3A is a front view thereof and FIG. 3B is a back view thereof.

【0022】

In FIG. 3, in the portable conference radiotelephone device of the second embodiment, the voice loudspeaker actuator 1a, the auxiliary device 2a that can be attached to the first plane, the echo canceling actuator 3, and the second plane can be attached. The auxiliary device 4a is built in the non-planar part occupied by the battery pack on the back surface of the mobile phone 1a. Alternatively, the actuators 1a and 3a and the flat-mountable auxiliary devices 2a and 4a each take a form that can be removed from the mobile phone 11a and used.

【0023】

The mobile phone device 11a is mounted on a vibrable flat surface (glass window, door, desk, blackboard, whiteboard, etc.) in the space where the conference call is held, or is flat with the actuators 1a, 2a removed from the mobile phone 11a. Auxiliary devices 3a and 4a that can be attached to the device are attached to a vibrable flat surface.

【0024】

[Effect of the invention]

As described above, the present invention is a portable conference radiotelephone including a loudspeaker / sound collecting / means and an echo canceling means capable of simultaneously talking to a plurality of speakers in a plurality of groups in each of the plurality of groups. A telephone conference can be held by having multiple speakers of a plurality of groups talking to each other via a radiotelephone network that is equipped with a device and connects to each portable conference radiotelephone device of each group via a wireless line. Therefore, the following effects can be obtained.

【0025】

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

【0026】

The reason is that by using voice loudspeaker and sound collecting means, it overcomes the contradictory point that multiple people can obtain enough output to hear the voice by the portable conference radiotelephone device and at the same time have portability. Because it is doing.

【0027】

The second effect is that it enables hands-free and simultaneous transmission / reception communication without using an auxiliary device such as a headset.

【0028】

The reason is that the portable conference radiotelephone device is provided with an echo canceling means for removing an echo component from the voice input from the sound collecting means.

[Simple explanation of drawings]

[Figure 1]

It is a schematic diagram which shows the conference telephone system using the mobile terminal of one Embodiment of this invention.

[Figure 2]

It is a block diagram which shows the 1st Example of the portable conference radiotelephone apparatus used for this Embodiment shown in FIG.

[Fig. 3]

A second embodiment of the form wireless telephone device used in the present embodiment shown in FIG. 1 is shown, (a) is a front view thereof, and (b) is a back view thereof.

[Fig. 4]

It is a relay system diagram which shows an example of the conference telephone system using the conventional mobile terminal.

[Explanation of symbols]

1,1a Voice loudspeaker actuator 2a, 4a Auxiliary 3,3a Echo cancellation actuator 5,5a Microphone (microphone) 6,8 amplifier circuit 7 Echo cancel circuit 9a Output auxiliary terminal 9b Input auxiliary terminal 10 Conference accessories 11,11a mobile phone 12 Portable conference radiotelephone device 13 Wireless telephone network 14,16 Speaker 15,17 table