Patent ID: 7359456

Claim:
A communication system for transmitting a transmission signal in digital form from a transmitter to a receiver, wherein: the transmitter comprises: a modulation part modulating a carrier wave in accordance with the transmission signal according to frequency modulation; a digital conversion part performing 1-bit quantization on a modulated signal obtained as a result of the modulation in the modulation part; and the receiver comprises: a reception part receiving the digital data transmitted from the transmission part; and a demodulation part demodulating the digital data received by the reception part according to the frequency modulation, wherein the digital conversion part of the transmitter includes a comparator and a flip-flop circuit, the comparator having a non-inverting input and a grounded inverting input, and the digital conversion part performs the 1-bit quantization by inputting the modulated signal to the non-inverting input of the comparator, supplying an output of the comparator to the flip-flop circuit, and causing the flip-flop circuit to sample the output of the comparator at a rise time of a sampling clock signal supplied thereto.