SIGNAL RECORDING AND REPRODUCING SYSTEM

摘要

PURPOSE:To pick up clock information from a reproduction signal, by combining the clock information pickup technology when the level inverting interval of reproduction pulse waves is definite with the nature of a digital signal converted from an analog signal. CONSTITUTION:An input analog signal is AD-converted 1 into a digital signal in 16-bit. The level degradation circuit 2 makes code conversion indicating adjacent level that the least significant bit is zero and other bits are 1 when all the bits are 1, and the least significant bit 1 and other bits are 0 when all the bits are 0, and an error detection/correction code is added 3 and a synchronizing signal is added 4. A signal with level inversion is formed when the bits are 1 by a modulation circuit 5 and it is outputted to a recording head 7 via a recording amplifier 6. At reproduction, a synchronizing signal pattern is detected at a synchronizing signal separation circuit 13 after clock reproduction 11 and demodulation 12 and outputted through an error detection/correction 14.