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ReПо поводу кодирования CD-A (+)

Автор: Pumbaa
Дата: 21.03.01, @10:49

  Frame Encoding: The CD-A PCM data stream is encoded into frames which contain additional information. Six 32-bit stereo PCM samples (i.e., 16-bits for each of 2 audio channels, totalling 192 audio data bits or 24 8-bit words) are encoded by Cross-Interleave Reed-Solomon Code CIRC and combined with the 64 CIRC parity bits (8 words) resulting, 8 subcode bits (P, Q, R, S, T, U, V, W), and 24 synchronization bits (used to indicate the start of a frame) to produce a 288-bit frame. This frame is presented for EFM modulation (all but the synch word are EFM modulated). As a result of interleaving, the 6 audio samples included in a frame have arisen from different (discontinuous) times as discussed above. The P and Q bits of the subcode data specify the number of selections or "tracks" on the disk (99 maximum), their beginning and ending points or times, and index points (up to 100 within each track or selection). The frame rate for an audio CD is 44,100/6 = 4350 frames/sec. The subcode block rate (98 frames per block) is 7350/98 = 75 blocks/sec (see below).

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