Patent ID: 7706219

Claim:
A signal processing apparatus for an optical disc drive, the signal processing apparatus comprising: a plurality of sample and hold units for correspondingly holding a plurality of analog photo diode signals; a signal holding controller coupled to the plurality of sample and hold units for generating control signals to the plurality of sample and hold units for holding the analog photo diode signals according to a programmable holding rule; a plurality of analog adjusting modules, each of the plurality of analog adjusting modules coupled to a corresponding sample and hold unit for adjusting the corresponding held analog photo diode signal; a multiplexer comprising a plurality of input ends and an output end, each input end coupled to a corresponding analog adjusting module, the multiplexer selectively coupling one input end of the multiplexer to the output end of the multiplexer for outputting the corresponding adjusted analog photo diode signal; and an analog to digital converter coupled to the output end of the multiplexer for converting the adjusted analog photo diode signals into digital photo diode signals.