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(四)数字信号处理电路(DSP)不良引起的“马赛克”故障判断数字信号处理电路是否正常,重点是测CD板上C2PO输出端波形,若有较密而宽的脉冲,则说明数字信号处理器或其外围电路性能不良。在数字信号处理器内部设有C1纠错系统和C2纠错系统,称为交叉交织里德——所罗门码(CIRC)的错误信号处理方法,用以纠正重放中出现的误码,当有些数据块出错严重,C1纠错系统不能完全纠正时,输出C1错误指针信号,并加以C2纠错系统输入端,C2纠错系统若再不能校准,则输出C2错误指针信号(C2PO)。当C2PO为低电平时,输出的数据便是正确的;当C2PO有较密而脉
(D) digital signal processing circuit (DSP) caused by the failure of the “mosaic” to determine the digital signal processing circuit is normal, the key is to measure the C2PO waveform on the CD board output, if there are more dense and wide pulse, then digital signal processing Poor performance of the device or its peripheral circuits. A C1 error correction system and a C2 error correction system are provided inside the digital signal processor, and an error signal processing method called cross interleaving Reed-Solomon code (CIRC) is used to correct the error occurred during reproduction. When some When the C1 error correction system can not completely correct, output the C1 error pointer signal and add the C2 error correction system input end. If the C2 error correction system can not calibrate it again, output the C2 error pointer signal (C2PO). When C2PO is low, the output data is correct; when C2PO is more dense and pulse