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Delta Modulation. Professor: Dr. Miguel Alonso Jr. Outline. Delta Modulation Continuously variable slope delta modulation Demodulation. Delta Modulation. Next form of pulse modulation

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delta modulation

Delta Modulation

Professor: Dr. Miguel Alonso Jr.

outline
Outline
  • Delta Modulation
  • Continuously variable slope delta modulation
  • Demodulation
delta modulation3
Delta Modulation
  • Next form of pulse modulation
  • Transmits information only to indicate whether the analog signal that is being encoded goes up or goes down
  • The Encoder Outputs are highs or lows that “instruct” whether to go up or down, respectively
  • DM takes advantage of the fact that voice signals do not change abruptly
slide4

The analog signal is quantized by a one-bit ADC (a comparator implemented as a comparator)

  • The comparator output is converted back to an analog signal with a 1-bit DAC, and subtracted from the input after passing through an integrator
  • The shape of the analog signal is transmitted as follows: a "1" indicates that a positive excursion has occurred since the last sample, and a "0" indicates that a negative excursion has occurred since the last sample.
limitations of the system
Limitations of the system
  • Slope overload
  • When the analog signal has a high rate of change, the DM can “fall behind” and a distorted output occurs
tradeoffs
Tradeoffs
  • Simplicity versus Quality
  • In order to obtain the high quality DM requires very high sampling rates, typically 20× the highest frequency of interest, as opposed to Nyquist rate of 2×