METHOD AND DEVICE FOR MULTIMEDIA MULTIPLE TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To allow a receiving end to stably perform automatic equalization when a data signal and a sound signal are multiplexed and multiple transmission is performed by a single analog line. SOLUTION: A sending part 30 puts together two kinds of signals by allocating a data signal to a data signal point in a 1st two-dimensional coordinate space and allocating an analog signal to a relative 2nd two-dimensional coordinate space that makes the data signal point the original point and sends it to a transmission line. The part 30 is provided with a random converting part 52 which randomly converts the analog signal that is allocated to the 2nd two-dimensional coordinate space. A receiving part 32 decides a signal point from a receiving point in the 1st two-dimensional coordinate space due to a received signal on the transmission line, reproduces a data signal and reproduces an analog signal based on the error between the receiving point and a decision signal point. The part 32 is provided with a random inverse converting part 76 which performs random inverse conversion of a demodulated analog signal and converts it into the original analog signal.