DIGITAL SIGNAL TRANSMITTER AND METHOD AND DIGITAL SIGNAL MODULATION DEMODULATION METHOD

摘要

PROBLEM TO BE SOLVED: To attain digital signal transmission with high quality by suppressing an analog audio signal component in the case of sending a 1-bit digital signalΔΣ-modulated. SOLUTION: A modulation circuit 10 generates a 1-bit transmission signals J by adding an inverted monaural signal I of a 1-bit audio signal F being a sum signal of the A and B per 3 samples to a 1-bit audio signal A of an L channel(ch) received from an input terminal 11 and a 1-bit audio signal B of an R channel(ch) received from an input terminal 12. A demodulation circuit 30 demodulates only the above 2-channel 1-bit audio signals M, N of the 1-bit transmission signals J sent via a transmission line 25.