PURPOSE: To improve the quality of reproduced main information by decreasing a DC component of a recording signal of additional information added to the main information.
CONSTITUTION: In the case of recording a MUSE signal, an 8-bit control signal converted by an A/D converter 103 is given to a control binary identification section 106, in which a most significant bit is identified and the signal is converted into binary data. Then the binary data are converted into 8-bit codes '44H', '98H' (in hexadecimal representation) by a code conversion section 110 so that a DC component after the modulation is less and an inter-code distance between the codes is remote. In the case of reproducing the MUSE signal, an 8-bit control signal read from a memory 140 is decoded into binary data by a code identification section 144 and then a control signal assignment section 148 allocates original input data to the data. When the code is dissident with the code at recording, the code identification section 144 selects a code with a closer code interval and decodes it into binary data.
AOKI AKIO
SHIMOKOORIYAMA MAKOTO
