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delta modulation (DM)

Delta modulation (DM) is a type of differential pulse code modulation (DPCM) which differs in that the adjacent samples can only deviate from the real sample by the values +1 or -1.

Delta modulation

Delta modulation

Only one bit is used to encode adjacent samples. Fast and high signal changes can be captured by increasing the sampling rate, but a good speech quality requires a bit rate of more than 200 kbit/s. If the step height is adapted to the signal to be sampled, delta modulation becomes adaptive delta modulation (ADM).

Delta modulation is used in the sigma-delta converter, among others.

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Englisch: delta modulation - DM
Updated at: 05.09.2011
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