JPH07193862A - Portable telephone terminal - Google Patents

Abstract

PURPOSE:To obtain the portable telephone terminal having an addition and distribution function of voice signals. CONSTITUTION:A conversion circuit 2 sends/receives an electric signal with an antenna 1 and sends/receives a channel signal with a channel multiplexer/ demultiplexer circuit 3. The channel multiplexer/demultiplexer circuit 3 demultiplexes the channel signal into a control channel and individual voice signal channel and multiplexes the control channel and the individual voice signal channels into one channel signal. A control circuit 4 applies termination control to the control channel. An adder circuit 5 adds voice signals superimposed on respective channels demultiplexed by the channel multiplexer/ demultiplexer circuit 3. A voice amplifier circuit 6 converts the voice signal added by the adder circuit into a prescribed listening sound pressure level and converts a voice uttered by a subscriber into a prescribed electric signal level. A voice distribution circuit 7 distributes voice signals outputted from the voice amplifier circuit into each channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone terminal, and more particularly to a conference call function of the mobile phone terminal.

[0002]

2. Description of the Related Art Conventionally, in a voice conference system using mobile telephone terminals, the voice signals received from all the mobile telephone terminals participating in the conference on the side of the switching network accommodating the mobile telephone terminals are added to one and each mobile telephone terminal is added. This was realized by installing a voice conference trunk that distributes the added voice signal from all mobile phone terminals except the mobile phone terminal.

[0003]

As described above, in the conventional conference system using the mobile telephone terminals, the addition and distribution functions of the voice signals are provided on the exchange side, so that the voice conference trunk is installed from each mobile telephone terminal. It is necessary to set up a voice call path to the existing switching equipment, which causes an increase in the line capacity traffic of the network, and in order to avoid an increase in the line capacity traffic, a voice conference trunk that adds and distributes voice signals. Is required for all exchanges or a number close to it for the exchange network side, which has a disadvantage of increasing cost.

[0004]

A portable telephone terminal of the present invention includes an antenna for transmitting and receiving radio waves to and from a base station and an electric signal received from the antenna to remove a carrier wave and convert it into a channel signal. A conversion circuit that receives the channel signal from the channel demultiplexing circuit, adds the carrier wave, converts the channel signal into the electric signal, and sends the electric signal to the antenna, and a control channel that receives the channel signal from the conversion circuit and an individual voice signal channel And a channel demultiplexing circuit that separates the control channel and each of the audio signal channels into one channel signal and sends the channel signal to the conversion circuit, and a control circuit that terminates and controls the control channel, An adder circuit for combining the audio signals superimposed on the n audio signal channels separated by the channel demultiplexing circuit into one; The audio signal synthesized by the arithmetic circuit is converted to a predetermined listening sound pressure level and output, and the audio amplifier circuit for converting the utterance voice to a predetermined audio signal level and the audio signal output by the audio amplifier circuit are output. It has a voice distribution circuit for distributing to n channels, and enables a voice conference between a plurality of mobile telephone terminals via a switching network.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a mobile phone terminal of the present invention. In this embodiment, an antenna 1 having a function of converting an electric wave into a carrier wave, an audio signal, and an electric signal which is electric energy of a control signal, and a control signal and an audio signal by removing a carrier wave from an electric signal input from the antenna. And a channel demultiplexing function for demultiplexing a call processing control channel and individual voice channels, and a channel demultiplexing circuit for adding a carrier wave to the channel signal received from the channel demultiplexing circuit and outputting it to the antenna. The demultiplexing circuit 3, the control circuit 4 having a function of generating and detecting each control information of the control channel, the adding circuit 5 for synthesizing the audio signals of the respective channels demultiplexed by the channel demultiplexing circuit, and the added audio signal are predetermined. A voice amplification circuit 6 for converting the listening sound pressure level and the speech voice to a predetermined electric signal level, and a voice amplification circuit. It consists audio distribution circuit 7 for distributing to each voice channel in order to distribute more audio signal converted into a predetermined electric signal level to all mobile phone terminals participating conference.

The antenna 1 receives a radio wave in which voice signals and channel signals of all mobile telephone terminals participating in the conference are multiplexed together with a carrier wave, converts the radio wave into an electric signal, and outputs the electric signal to the conversion circuit 2. The conversion circuit 2 removes unnecessary components such as carrier waves and outputs a channel signal to the channel demultiplexing circuit 3. The channel demultiplexing circuit 3 provides a control channel on which control information used for call processing such as calling and receiving is superimposed and an individual voice channel on which voice signals of all mobile telephone terminals participating in the conference are superimposed. Separated, the control channel information is output to the control circuit 4, and the audio signal of each audio channel is output to the addition circuit 5. The adder circuit 5 synthesizes the voice signal of the mobile phone terminal superimposed on each channel and outputs it to the voice amplifier circuit 6. The subscriber of the mobile phone terminal listens to the speech sound from all the mobile phone terminals participating in the conference at a predetermined sound pressure level.

The voice of the subscriber of the mobile phone terminal is converted into a predetermined voice signal level by the voice amplifier circuit 6 and output to the voice distribution circuit 7. The voice distribution circuit 7 distributes the inputted voice signal of the subscriber of the mobile telephone terminal to all the mobile telephone terminals participating in the conference other than the own mobile telephone terminal, and distributes them to respective voice channels to perform channel-multiplexed voice distribution. Circuit 3
Output to. The channel demultiplexing circuit 3 multiplexes the subscriber voice signal distributed to each channel together with a control signal and outputs the multiplexed signal to the conversion circuit 2. The conversion circuit 2 converts the multiplexed channel signal into an electric signal, superimposes a predetermined carrier wave, and outputs the superposed carrier wave to the antenna 1. The antenna 1 converts the input electric signal into a radio wave and outputs it. Radio waves are transmitted and received between a mobile phone terminal and a base station (not shown).

As described above, since a plurality of voice channels are provided for one carrier wave and mobile telephone terminals can be individually assigned to the respective voice channels and respective voice signals can be transmitted, one mobile telephone terminal is required to have a conventional structure. As described above, it is possible to avoid an increase in the traffic of the line capacity due to the occupied communication channel.

[0009]

As described above, according to the present invention, the function of adding voice signals received from other mobile telephone terminals and distributing the voice signal of the own mobile telephone terminal to all other mobile telephone terminals is incorporated in the mobile telephone terminals. By doing so, it is possible to avoid an increase in the line capacity traffic of the switching network.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 antenna 2 conversion circuit 3 channel demultiplexing circuit 4 control circuit 5 addition circuit 6 audio amplification circuit 7 audio distribution circuit

Claims (1)

[Claims] 1. An antenna for transmitting and receiving radio waves to and from a base station, and an electric signal is received from the antenna to remove a carrier wave to be converted into a channel signal, and the channel signal is received from a channel demultiplexing circuit. A conversion circuit that adds a carrier wave, converts the electric signal, and sends the electric signal to the antenna,
The channel signal is received from the conversion circuit and separated into a control channel and individual audio signal channels, and the control channel and individual audio signal channels are multiplexed into one channel signal and sent to the conversion circuit. The channel demultiplexing circuit, a control circuit for terminating control of the control channel, an adder circuit for synthesizing the audio signals superimposed on the n audio signal channels separated by the channel demultiplexing circuit into one, The audio signal synthesized by the adder circuit is converted into a predetermined listening sound pressure level and output, and at the same time, a voice amplifier circuit for converting the utterance voice into a predetermined voice signal level, and the voice signal output by the voice amplifier circuit are described above. a voice distribution circuit for distributing to n channels,
A mobile phone terminal characterized by enabling a voice conference between a plurality of mobile phone terminals via an exchange network.