| 摘要 |
A subcode signal reading circuit in a compact disc player of the compact disc digital audio system comprises an EFM demodulation circuit which receives an EFM reproduction signal reproduced from a disc, EFM-demodulates the EFM reproduction signal and outputs a demodulated eight-bit signal, a first register in which a Q subcode included in the demodulated eight-bit signal provided by the EFM demodulation circuit is written in eight-bit fashion, a second register to which contents of the first register are transmitted and an error detection circuit for detecting whether or not the Q subcode produced by the EFM demodulation circuit contains error. Transmission of the contents of the first register to the second register is controlled by an output of the error detection circuit in such a manner that the transmission is made when no error has been detected by the error detection circuit. An output of the second register is used in the disc player as a correct Q subcode to be read.
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