Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Delta modulation

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 streams. In delta modulation, the transmitted data is reduced to a 1-bit data stream. Its main features are:

  • the analog signal is approximated with a series of segments
  • each segment of the approximated signal is compared to the original analog wave to determine the increase or decrease in relative amplitude
  • the decision process for establishing the state of successive bits is determined by this comparison
  • only the change of information is sent, that is, only an increase or decrease of the signal amplitude from the previous sample is sent whereas a no-change condition causes the modulated signal to remain at the same 0 or 1 state of the previous sample.

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.

Derived forms of delta modulation are continuously variable slope delta modulation, delta-sigma modulation, and differential modulation. Differential pulse-code modulation is the super set of DM.

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email: a.abokhalil@mu.edu.sa

a_galal@yahoo.com

Phone: 2570

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