JP2611736B2 - Mobile phone 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 portable telephone terminal, and more particularly to a conference call function of the portable telephone terminal.

[0002]

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

[0003]

As described above, in the conventional conference system using portable telephone terminals, since the function of adding and distributing voice signals is provided on the exchange side, a voice conference trunk is installed from each portable telephone terminal. It is necessary to set up a voice communication path to the exchange, which causes an increase in the network capacity traffic as a network, and a voice conference trunk for adding and distributing voice signals in order to avoid an increase in the network capacity traffic. There is a disadvantage in that the number is required for all exchanges or a number close to it is required on the exchange network side, and the cost increases.

[0004]

SUMMARY OF THE INVENTION A portable telephone terminal according to the present invention comprises an antenna for transmitting and receiving radio waves to and from a base station, an electric signal received from the antenna, a carrier removed, and converted into a channel signal. A conversion circuit that receives the channel signal from a channel demultiplexing circuit, adds the carrier wave, converts the signal into the electric signal, and sends the signal to the antenna; a control channel and individual audio signal channels that receive the channel signal from the conversion circuit; And the channel multiplexing / demultiplexing circuit that multiplexes the control channel and the individual audio signal channels into one channel signal and sends the multiplexed signal to the conversion circuit; and a control circuit that terminates and controls the control channel. An addition circuit that combines 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 an audio amplifier circuit for converting the uttered voice to a predetermined audio signal level is provided. and a voice distribution circuit for distributing to n channels, enabling a voice conference between a plurality of mobile telephone terminals via a switching network.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the mobile phone terminal of the present invention. In this embodiment, an antenna 1 having a function of converting radio waves into electric signals, which are electric energies of a carrier wave, a voice signal and a control signal, and a carrier wave removed from an electric signal input from the antenna to obtain a control signal and a voice signal A conversion circuit 2 for converting a channel signal received from the channel multiplexing / demultiplexing circuit, adding a carrier wave to the channel signal, and outputting the resulting signal to an antenna; A demultiplexing circuit 3, a control circuit 4 having a function of generating and detecting control information of each control channel, an addition circuit 5 for synthesizing audio signals of each channel separated by the channel demultiplexing circuit, A sound amplification circuit 6 for converting the sound to a predetermined electric signal level while converting the sound to a listening sound pressure level; 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 the mobile telephone terminals participating in the conference are multiplexed together with a carrier, converts the radio wave into an electric signal, and outputs the electric signal to the conversion circuit 2. The conversion circuit 2 removes an unnecessary component such as a carrier wave and outputs a channel signal to the channel demultiplexing circuit 3. The channel multiplexing / demultiplexing circuit 3 includes a control channel on which control information used for call processing such as outgoing and incoming calls is superimposed, and an individual voice channel on which audio signals of all the mobile telephone terminals participating in the conference are superimposed. 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 the synthesized signal to the voice amplifier circuit 6. The subscriber of the mobile phone terminal listens to the speech voice from all the mobile phone terminals participating in the conference at a predetermined sound pressure level.

[0007] The voice of the subscriber of the portable telephone terminal is converted into a predetermined voice signal level by a voice amplifier circuit 6 and output to a voice distribution circuit 7. The voice distribution circuit 7 distributes the input voice signal of the subscriber of the mobile phone terminal to all the mobile phone terminals participating in the conference other than the mobile phone terminal, and distributes the voice signal to each voice channel. Circuit 3
Output to The channel multiplexing / demultiplexing circuit 3 multiplexes the subscriber voice signal distributed to each channel together with the 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, and outputs the signal to the antenna 1. The antenna 1 converts an input electric signal into a radio wave and outputs the radio wave. Radio waves are transmitted and received between a mobile phone terminal and a base station (not shown).

As described above, a plurality of voice channels are provided for one carrier, and mobile telephone terminals can be individually allocated to each voice channel to transmit respective voice signals. In this way, it is possible to avoid an increase in the traffic of the line capacity due to the occupation of the communication channel.

[0009]

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

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION 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)

(57) [Claims] An antenna for transmitting and receiving radio waves to and from a base station, an electric signal received from the antenna, a carrier is removed and converted to a channel signal, and the channel signal is received from a channel demultiplexing circuit. A conversion circuit for adding a carrier wave, converting the electric signal to the electric signal, and transmitting 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 the individual audio signal channels are multiplexed into one channel signal and transmitted to the conversion circuit. The channel multiplexing / demultiplexing circuit, a control circuit for terminating the control channel, an adding circuit for combining audio signals superimposed on the n audio signal channels separated by the channel multiplexing / demultiplexing circuit, The audio signal synthesized by the adder circuit is converted to a predetermined listening sound pressure level and output, and an audio amplifier circuit for converting a uttered voice to a predetermined audio signal level, and the audio signal output by the audio amplifier circuit is an audio distribution circuit for distributing to n channels,
A mobile phone terminal capable of conducting a voice conference between a plurality of mobile phone terminals via an exchange network.