Delta modulation (DM or Δ-modulation) is an analog-to-digital and digital-to-analog signal conversion technique used for transmission of voice information where quality is not of primary importance. DM is the simplest form of differential pulse-code modulation (DPCM) where the difference between successive samples are encoded into n-bit data stre...
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http://en.wikipedia.org/wiki/Delta_modulation
a form of differential pulse code modulation in which only the sign of the difference between each signal sample and its predicted value is retained and encoded by a single binary digit
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-06-61
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