DPCM

Encode the difference of DC component from previous 8x8 blocks using Differential Pulse Code Modulation (DPCM).

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Example - FT of bandlimited signal: Differential Coding - DPCM

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Today´s build includes brand new logic for DPCM sample fetching - under some circumstances, the old code could skip samples (and get thrown into an infinite loop if there was only 1 sample).

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ADPCM uses a modified Differential Pulse Code Modulation (DPCM) sampling technique where the encoding of a each sample is derived by calculating a 'difference' (DPCM) value, and applying to this a complex formula which includes the previous quantization value.

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Pulse code modulation (PCM), differential pulse code modulation (DPCM), delta modulation (DM).

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(DPCM), Delta Modulation (DM), and Ad aptive Delta Modulatio n (ADM), Comparison of various system in terms of

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DPCM Differential PCM DPE Data path extender DPGS Digital pair gain systems DPIDB Direct PIDB DPIDB Directly connected peripheral interface data bus DPLL Digital phase locked loop DPN Dip purge number DPN-PH Data packet network-packet handler DPNSS Digital private network signaling system (BT)

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Advantage of using difference d (n) instead of the actual value x (n) Reduce the number of bits to represent a sample General DPCM: d (n) = x (n) - a1x (n-1) - a2x (n-2) - … - akx (n-k) a1, a2, … ak are fixed Adaptive DPCM: a1, a2, … ak are dynamically changed with signal 11

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ADPCM Based on the fact that neighboring samples … x (n-1), x (n), x (n+1), … in a discrete time sequence changes slowly in many applications, e.g., voice, audio, … A differential PCM coder (DPCM) quantizes and encodes the difference d (n) = x (n) - x (n-1)

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Used in various EA titles. experimental codec experimental codec DV audio Electronic Arts ADPCM XX Sonic Sonic lossless FLAC lossless audio G. 726 ADPCM id RoQ DPCM XXXXXXXXXX Used in Quake III, Jedi

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