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在重放CD光盘时,因为CD光盘是数字音频信号,该信号的频谱在1.7MHz以下,所以该机中具有一套数字音频信号处理电路如图6所示。从激光头拾取的RF信号分成二路,一路送到模拟音频信号处理电路;另一路送到伺服控制电路内的低通滤波器取出数字音频信号,从IC101的4脚输出,经IC201的第8脚送到CD信号处理器,将数字音频信号整形、放大后送到数字音频信号处理电路IC111与卡拉OK的信号及传声器来的信号混合、选择切换。
When playing back a CD, the CD has a set of digital audio signal processing circuits as shown in FIG. 6 because the CD is a digital audio signal having a frequency spectrum below 1.7 MHz. The RF signal picked up from the laser head is divided into two paths and sent to the analog audio signal processing circuit all the way; the other one is sent to the servo control circuit to remove the digital audio signal from the 4-pin output of IC101, Feet sent to the CD signal processor, the digital audio signal shaping, amplified and sent to the digital audio signal processing circuit IC111 and karaoke OK signal and the microphone signal mixing, choose to switch.