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先驱MD-911CD机在发烧友中有较高的拥有量,为了提高该机的素质,笔者用中裕公司的PCM1716DAC摩板对该机进行了改造。一切连线完毕,发现音质改善明显,但是选曲及暂停过程中的噪声随之而来。原以为该摩板有高、低电平静噪输入端,只要把原DSP芯片⑥脚的“MUTE”信号引至摩板的相应静噪端子就万事大吉。但是,一量⑥脚电压,大吃一惊。原来该脚只是在启动后的第一次选曲才会有电平从高至低的翻转(也即只具有片头噪声的消除功能)。至于以后的中途选曲及暂停操作,该脚始终保持低电平,而不会翻转。而摩板需要的却是每次选曲和暂停都有电平
Pioneer MD-911CD machine has a higher share of enthusiasts, in order to improve the quality of the aircraft, the author with the company’s PCM1716DAC friction plate on the aircraft was transformed. After all the connections were completed, we found that the sound quality improved obviously, but the noise during the selection and suspension was followed. The original thought that the friction plate has high and low level mute input, as long as the original DSP chip ⑥ foot “MUTE” signal to the mute board corresponding mute terminal will do everything. However, a volume of ⑥ foot voltage, surprise. It turned out that the foot is only the first time after the start of the song will have a level from high to low flip (that is, only with the film noise elimination function). As for the midway song selection and pause operation, the foot is always low, but not flip. The friction plate is required for each song and pause has a level