Adaptive delta modulation or [ continuously variable slope delta modulation ] ( CVSD ) is a modification of DM in which the step size is not fixed.
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The complete function of delta modulation, VAC and Echo Control for six ports was implemented in a single digital integrated circuit chip with twelve bit arithmetic.
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The 5.1 tracks were encoded using 16-bit PCM audio in a delta modulation compression which resulted in a compression level of 4 : 1.
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The complete function of delta modulation, VAC, and echo control for 6 ports was implemented in a single digital integrated circuit chip with 12-bit arithmetic.
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Using an oversampling design and a modulation scheme called sigma-delta modulation ( SDM ), analog anti-aliasing filters can effectively be replaced by a digital filter.
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The "'dbx Model 700 Digital Audio Processor "'was a professional audio Delta Modulation, " rather than the now-common pulse-code modulation.
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To achieve high signal-to-noise ratio, delta modulation must use oversampling techniques, that is, the analog signal is sampled at a rate several times higher than the Nyquist rate.
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NVP was used to send speech between distributed sites on the ARPANET using several different voice-encoding techniques, including linear predictive coding ( LPC ) and continuously variable slope delta modulation ( CVSD ).
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It is based on voice being digitized using 12 kbit / s Continuously Variable Slope Delta modulation ( CVSD ) and then encrypted using a National Security Agency ( NSA ) Commercial COMSEC Endorsement Program ( CCEP ) Type I encryption algorithm.
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A wide variety of other algorithms were tried at the time, mostly variants on delta modulation, but after careful consideration, the A-law / ?-law algorithms were chosen by the designers of the early digital telephony systems.
