Abstract:

The standards for 12-cm optical discs were established in 1982(CDs), 1996(DVDs) respectively. When these standards were decided, the important issue was their recording capacity. For CDs the requirement was 74 minutes of recording audio signals(2-channel) and a capacity of about 800MB and for DVDs, the requirement as a video disc was 2hr &15 min using the standard definition with MPEG-2 compression & considering image quality the capacity was determined to be 4.7 GB

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