Patent ID: 7702022

Claim:
A communication system for transmitting and receiving, comprising: a transmitting device including: a data generating unit to generate a data item by modulating a data item to be sent, an impulse generating unit to generate impulses corresponding to the data item generated by the data generating unit, a transmitting channel selecting unit to allow frequency components of the impulses corresponding to a frequency band of one of transmitting channels to pass through while the impulses attempt to pass through the transmitting channel selecting unit, the transmitting channel selecting unit including: a plurality of filters corresponding to the transmitting channels, each of said filters being adapted to allow a frequency component corresponding to the respective transmitting channel to pass through, and a filter selecting unit to select one of the filters corresponding to said one of the transmitting channels by switching on an input switch and an output switch of the selected filter synchronously with each other, and a transmitting unit to transmit the impulses that have passed through the transmitting channel selecting unit as signals; and a receiving device including: a receiving unit to receive the signals transmitted from the transmitting unit, a receiving channel selecting unit to allow the frequency components of the received signals within the frequency band corresponding to said one of the transmitting channels to pass through while the received signals attempt to pass through the receiving channel selecting unit, the receiving channel selecting unit including: a plurality of filters, the filters corresponding to the receiving channels, each of said filters being adapted to allow a frequency component corresponding to the respective receiving channel to pass through, and a filter selecting unit to select on of the filters corresponding to said one of the receiving channels by switching on an input switch and an output switch of the selected filter synchronously with each other, and a data restoring unit to extract the impulses from the signals that have passed through the receiving channel selecting unit so as to restore the data item sent in accordance with the extracted impulses.