Multichannel communication system

A multichannel communication system comprising:

• a transmitter for frequency-division-multiplexing signals in a plurality of channels and transmitting the frequency-division-multiplexed signals;
• and
• a receiver for selectively receiving a signal in one of the channels;
• said transmitter comprising:
• inserting means for inserting time interval data indicative of a time interval until next additional information is transmitted, into control information common to the channels;
• control information multiplexing means for time-division-multiplexing main information in each of the channels with the control information in which the time interval data has been inserted by said inserting means, based on previously inserted time interval data at the same timing;
• and
• transmitting means for frequency-division-multiplexing and transmitting the mail information in each of the channels which has been time-division-multiplexed with the control information by said control information multiplexing means;
• said receiver comprising:
• signal extracting means for extracting the signal in said one of the channels from frequency-division-multiplexed signals transmitted from said transmitting means;
• control information separating means for separating control information from the signal in said one of the channels which is extracted by said signal extracting means;
• inhibit signal generating means for generating a channel change inhibit signal based on time interval data inserted in previous control information separated by said control information separating means;
• and
• inhibit means for inhibiting said signal extracting means from extracting the signal in said one of the channels which is indicated by a channel change signal from the frequency-division-multiplexed signals transmitted from said transmitting means if a channel change inhibit signal is transmitted from said inhibit signal generating means when said signal extracting means receives said channel change signal.

A multichannel communication system comprising:

• a transmitter for frequency-division-multiplexing signals in a plurality of channels and transmitting the frequency-division-multiplexed signals;
• and
• a receiver for selectively receiving a signal in one of the channels;
• said transmitter comprising:
• inserting means for inserting time data indicative of a time at which to transmit next additional information, into control information common to the channels;
• control information multiplexing means for time-division-multiplexing main information in each of the channels with the control information in which the time data has been inserted by said inserting means, based on previously inserted time data at the same timing;
• and
• transmitting means for frequency-division-multiplexing and transmitting the main information in each of the channels which has been time-division-multiplexed with the control information by said control information multiplexing means;
• said receiver comprising:
• signal extracting means for extracting the signal in said one of the channels from frequency-division-multiplexed signals transmitted from said transmitting means;
• control information separating means for separating control information from the signal in said one of the channels which is extracted by said signal extracting means;
• inhibit signal generating means for generating a channel change inhibit signal based on previous time data inserted in previous control information separated by said control information separating means;
• and
• inhibit means for inhibiting said signal extracting means from extracting the signal in said one of the channels which is indicated by a channel change signal from the frequency-division-multiplexed signals transmitted from said transmitting means if a channel change inhibit signal is transmitted from said inhibit signal generating means when said signal extracting means receives said channel change signal.

A multichannel communication system comprising:

• a transmitter for frequency-division-multiplexing signals in a plurality of channels and transmitting the frequency-division-multiplexed signals;
• and
• a receiver for selectively receiving a signal in one of the channels;
• said transmitter comprising:
• inserting means for inserting period data indicative of a period at which to transmit additional information in next and following cycles, into control information common to the channels;
• control information multiplexing means for time-division-multiplexing main information in each of the channels with the control information in which the period data has been inserted by said inserting means, based on period data thus far at the same timing;
• and
• transmitting means for frequency-division-multiplexing and transmitting the mail information in each of the channels which has been time-division-multiplexed with the control information by said control information multiplexing means;
• said receiver comprising:
• signal extracting means for extracting the signal in said one of the channels from frequency-division-multiplexed signals transmitted from said transmitting means;
• control information separating means for separating control information from the signal in said one of the channels which is extracted by said signal extracting means;
• inhibit signal generating means for generating a channel change inhibit signal based on period data thus far inserted in control information separated by said control information separating means;
• and
• inhibit means for inhibiting said signal extracting means from extracting the signal in said one of the channels which is indicated by a channel change signal from the frequency-division-multiplexed signals transmitted from said transmitting means if a channel change inhibit signal is transmitted from said inhibit signal generating means when said signal extracting means receives said channel change signal.

A multichannel communication system comprising:

• a transmitter for frequency-division-multiplexing signals in a plurality of channels and transmitting the frequency-division-multiplexed signals;
• and
• a receiver for selectively receiving a signal in one of the channels;
• said transmitter comprising:
• inserting means for inserting time data indicative of a time at which to transmit additional information in next and following cycles, into control information common to the channels;
• control information multiplexing means for time-division-multiplexing main information in each of the channels with the control information in which the time data has been inserted by said inserting means, based on time data thus far at the same timing;
• and
• transmitting means for frequency-division-multiplexing and transmitting the mail information in each of the channels which has been time-division-multiplexed with the control information by said control information multiplexing means;
• said receiver comprising:
• signal extracting means for extracting the signal in said one of the channels from frequency-division-multiplexed signals transmitted from said transmitting means;
• control information separating means for separating control information from the signal in said one of the channels which is extracted by said signal extracting means;
• inhibit signal generating means for generating a channel change inhibit signal based on time data thus far inserted in control information separated by said control information separating means;
• and
• inhibit means for inhibiting said signal extracting means from extracting the signal in said one of the channels which is indicated by a channel change signal from the frequency-division-multiplexed signals transmitted from said transmitting means if a channel change inhibit signal is transmitted from said inhibit signal generating means when said signal extracting means receives said channel change signal.