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Consumer Electronics by S. P. Bali

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PLAYBACK SYSTEM

In reading back the information, the reflected light returning from the disc falls on a photodiode and its output is amplified and corrected according to the frequency characteristic of the player. A high-pass filter separates the video information and the filters have a crossover frequency at 3.5 MHz. The separated FM signals are then demodulated and a de-emphasis is applied to compensate for the pre-emphasis employed before recording, in order to achieve a better S/N ratio and a more uniform frequency response. The playback system is shown in Fig. 34.15.

 

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Fig. 34.14 The spectrum of video and audio signals. Black level is ...

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