Optical disc technology makes use of digital signal processing, contrary to the analog audio and video carriers, such as the gramophone record and the magnetic videotape. But why digital?
In analog transmission, any imperfection during the registration, storage or reproduction phases of recording will decrease the quality of the audio and/or video signal. For example, a dirty record causes noise, an irregular revolution or winding speed causes problems, a worn needle or a dirty head causes distortion. These imperfections do not occur in digital registration. (For more detailed and in-depth information, please refer to the Audio Handbook, in which the basic principles of the Compact Disc Technology are explained.) From analog to Digital In optical disc technology, analog signals are converted into digital signals (with the exception of the video information on laserdiscs, as will be explained later). During this process, the analog signal (audio and/or video) is measured in parts and converted into a series of values, called sampling. One can envision a waveform representing an audio or video signal, being measured with intervals. The signal strength and polarity at thes
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