Communication system capable of carrying out communication of speech and image with a simple structure

A communication system using time division multiple access and comprising a master station and a plurality of slave stations each of which communicates with said master station through a radio channel carrying a communication signal, each of said slave stations receiving said communication signal from said master station, each of said slave stations comprises:

• first slave means selectively supplied with slave speech and image signals as a slave input signal for converting said slave input signal into a slave coded signal, said first slave means being selectively supplied with a slave output signal and a slave decompressed signal as a master supplied signal for converting said master supplied signal into a master decoded signal;
• slave detecting means for detecting whether or not said slave coded signal is said slave image signal to produce a first slave detection signal when said slave coded signal is said slave speech signal, said slave detecting means producing a second slave detection signal when said slave coded signal is said slave image signal, said slave detecting means detecting whether or not said slave output signal is representative of said slave image signal to produce a third detection signal when said slave output signal is representative of a master speech signal, said slave detecting means producing a fourth slave detection signal when said slave output signal is representative of said master image signal;
• second slave means responsive to said first slave detection signal for compressing said slave coded signal into a slave compressed signal, said second slave means being responsive to said third slave detection signal for decompressing said slave output signal into said slave decompressed signal;
• and
• third slave means responsive to said first slave detection signal for producing said communication signal in accordance with said slave compressed signal, said third slave means being responsive to said second slave detection signal to produce said communication signal in accordance with said slave coded signal, said third slave means being supplied with said communication signal from said master station to produce said slave coded and said slave compressed signals as said slave output signal, said third slave means being responsive to said fourth slave detection signal to supply said slave output signal to said first slave means;
• said master station comprising:
• first master means selectively supplied with master speech and image signals as a master input signal for converting said master input signal into a master coded signal;
• master detecting means for detecting whether or not said master coded signal is said master image signal to produce a first master detection signal when said master coded signal is said master speech signal, said master detecting means producing a second master detection signal when said master coded signal is said master image signal;
• second master means responsive to said first master detection signal for compressing said master coded signal into a master compresses signal;
• and
• third master means responsive to said first master detection signal for producing said communication signal in accordance with said master compressed signal, said third master means being responsive to said second master detection signal to produce said communication signal in accordance with said master coded signal.

A communication system using time division multiple access and including a master station and a plurality of slave stations each of which communicates with said master station through a radio channel carrying a communication signal, said master station receiving said communication signal from at least a specific one of said slave stations, each of said slave stations comprising:

• a first slave circuit selectively supplied with slave speech and image signals as a slave input signal to convert said slave input signal into a slave coded signal,
• a slave detector detecting whether or not said slave coded signal is said slave image signal to produce a first slave detection signal when said slave coded signal is said slave speech signal, said slave detector producing a second slave detection signal when said slave coded signal is said slave image signal;
• a second slave circuit responsive to said first slave detection signal to compress said slave coded signal into a slave compressed signal;
• and
• a third slave circuit responsive to said first slave detection signal to produce said communication signal in accordance with said slave compressed signal, said third slave circuit being responsive to said second slave detection signal to produce said communication signal in accordance with said slave coded signal;
• said master station comprising:
• a first master circuit selectively supplied with master speech and image signals as a master input signal to convert said master input signal into a master coded signal, said first master circuit being selectively supplied with a master output signal and a master decompressed signal as a slave supplied signal for converting said slave supplied signal into a slave decoded signal;
• a master detector detecting whether or not said master coded signal is said master image signal to produce a first master detection signal when said master coded signal is said master speech signal, said master detector producing a second master detection signal when said master coded signal is said master image signal, said master detector detecting whether or not said master output signal is representative of the slave image signal to produce a third master detection signal when said master output signal is representative of said slave speech signal, said master detector producing a fourth master detection signal when said master output signal is representative of said slave image signal;
• a second master circuit responsive to said first master detection signal to compress said master coded signal into a master compressed signal, said second master circuit being responsive to said third master detection signal for decompressing said master output signal into said master decompressed signal;
• and
• a third master circuit responsive to said first master detection signal to produce said communication signal in accordance with said master compressed signal, said third master circuit being responsive to said second master detection signal to produce said communication signal in accordance with said master coded signal, said third master circuit being supplied with said communication signal from said specific slave station to produce said slave coded and said slave compressed signals as said master output signal, said third master circuit being responsive to a fourth master detection signal to supply said master output signal to said first master circuit.

A communication system using time division multiple access and comprising a master station and a plurality of slave stations each of which communicates with said master station through a radio channel carrying a communication signal, each of said slave stations receiving said communication signal from said master station, each of said slave stations comprises:

• a first slave circuit selectively supplied with slave speech and image signals as a slave input signal to convert said slave input signal into a slave coded signal, said first slave circuit being selectively supplied with a slave output signal and a slave decompressed signal as a master supplied signal for converting said master supplied signal into a master decoded signal;
• a slave detector detecting whether or not said slave coded signal is said slave image signal to produce a first slave detection signal when said slave coded signal is said slave speech signal, said slave detector producing a second slave detection signal when said slave coded signal is said slave image signal, said slave detector detecting whether or not said slave output signal is representative of said slave image signal to produce a third detection signal when said slave output signal is representative of a master speech signal, said slave detector producing a fourth slave detection signal when said slave output signal is representative of said master image signal;
• a second slave circuit responsive to said first slave detection signal to compress said slave coded signal into a slave compressed signal, said second slave circuit being responsive to said third slave detection signal for decompressing said slave output signal into said slave decompressed signal;
• and
• a third slave circuit responsive to said first slave detection signal to produce said communication signal in accordance with said slave compressed signal, said third slave circuit being responsive to said second slave detection signal to produce said communication signal in accordance with said slave coded signal, said third slave circuit being supplied with said communication signal from said master station to produce said slave coded and said slave compressed signals as said slave output signal, said third slave circuit being responsive to said fourth slave detection signal to supply said slave output signal to said first slave circuit;
• said master station comprising:
• a first master circuit selectively supplied with master speech and image signals as a master input signal to convert said master input signal into a master coded signal;
• a master detector detecting whether or not said master coded signal is said master image signal to produce a first master detection signal when said master coded signal is said master speech signal, said master detector producing a second master detection signal when said master coded signal is said master image signal;
• a second master circuit responsive to said first master detection signal to compress said master coded signal into a master compressed signal;
• and
• a third circuit means responsive to said first master detection signal for producing said communication signal in accordance with said master compressed signal, said third master circuit being responsive to said second master detection signal to produce said communication signal in accordance with said master coded signal.