Method and circuit for detecting playback signal which is compensated for time delay

摘要

A method and circuit for detecting a playback signal, which is compensated for time delay, is provided. The circuit includes a time delay compensator (218) for detecting a time difference between outputs of a photodetector (204) and temporally matching part of the outputs of the photodetector (204) and other parts of the outputs of the photodetector (204), between which the time difference occurs, to compensate for time delay between the output parts of the photodetector (204), and an operational unit (228) for summing the output parts of the photodetector which are compensated for the time delay, with the other part of the outputs of the photodetector to provide a playback signal. Accordingly, the circuit compensates for the time delay between the outputs of the photodetector (204), thereby increasing the degree of modulation of the data playback signal. In addition, the circuit maximumly suppresses the distortion or degradation of the signal and minimizes the occurrence of errors in the playback signal, thereby improving the reliability of the playback signal. <IMAGE>