Advantages and disadvantages of delta modulation

Advantages and disadvantages of delta modulation
Advantages and disadvantages of delta modulation

The modulation is the process used in a communication system used to transmit different kinds of signals over long distances without energy losses, a delta modulation is a technique used for analog-to-digital and digital-to-analog conversion. The transmission of voice information where quality is the primary goal.

Advantages of delta modulation

  • The transmitter and receiver implementation are very simple for data modulation, there is no analog-to-digital converter is required in delta modulation.
  • It is the most cost-effective technique
  • It requires less quantization
  • The amplitude of the audio signal does not exceed the maximum sinusoidal amplitude.
  • PCM has a sampling rate higher than the Nyquist rate, the encoded signal contains redundant information while delta modulation can efficiently remove this redundancy.
  • The signaling rate and bandwidth of delta modulation are less than the PCM technique.
  • Design is easy and simple
  • The bit rate can be designed by the user
  • Feedback mechanism
  • It approaches the high performance
  • This technology gets rid of the need for correcting circuits in radio design and error.
  • It had the higher dynamic range
  • There is no indication of granular or slop overload.
  • The slop error is reduced to a lever degree
  • ADC is not required, this permits easy generation and detection.

Explanation for advantages of delta modulation

Simple modulation technique

The delta modulation converts the difference between the input signal and the integral of the previous step.

Sampling rate

The sampling rate of a signal should be higher than the Nyquist rate to achieve delta sampling.

Nyquist rate

The Nyquist rate is the minimum rate at which a finite bandwidth signal needs to be sampled to retain all the pieces of information.

Disadvantages of delta modulation

  • Slope overload distortion
  • Granular or idle noise
  • High bit rate
  • Its practical usage is limited
  • Poor start-up response
  • The modulators overload when the slope of the signal is too high.
  • If the change in is signal less than step size, then the modulator no longer follows the signal.
  • It requires a predictor circuit and hence it is very complex.
  • Signals vary at a faster rate.

Explanation of delta modulation

Slope overload

The slope overload noise occurs when the slope of the input signal is greater than the delta modulator is capable of reproducing.

Granular or idle noise

The granular noise or idle noise is the manifestation of random signals when the variation of the input signal is smaller than the step size.

High bit rate

The output of delta modulation is a bit stream of samples, at a relatively high rate of 100kbits/sec or more for a speech bandwidth of 4 kHz.

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