Difference Between Pulse Code Modulation (PCM) and Delta Modulation (DM)

What is PCM?

PCM stands for pulse code modulation, It is used for reworking analog signal into a digital signal. PCM is a good or sensible signal to noise ration. PCM wants to high transmitter bandwidth. PCM method is split into three elements, the initial stage is that the transmission at the provision end, second registration at the transmission path and conjointly the receiving side of the end. 

What is DM?

While in DM stands for delta modulation, It is used for analog to digital and digital to analog signal conversion techniques. DM is employed to realize a high signal to noise ratio.  DM is smaller than PCM. 

Difference between delta modulation (DM) and pulse code modulation (PCM):

  • PCM stands for pulse code modulations while in DM is stands for delta modulations.
  • In PCM feedback does not exist in transmitter or receiver while in delta modulation feedback existed in the transmitter.
  • PCM requires the highest transmitter bandwidth while DM requires the lowest transmitter bandwidth.
  • PCM is complex in terms of complexity of implementation, whereas DM is simple in terms of complexity of implementation.
  • In PCM per sample 4,8, or 16 bits are used while in DM only one's bit is used per sample.
  • PCM may be a technique wont to digitally represent sampled analog signals while in DM convert digital to analog and analog to digital converter.
  • PCM is costly, DM is cheap.
  • PCM has a good signal to noise ratio while in DM has a poor signal to noise ratio.
  • PCM is mostly used in video telephony and audio telephony, DM is mostly used in speeches as well as images.
  • PCM signals are required encoder and decoder both sides while in DM signals can modulate and demodulates.
  • In PCM Quantization error depends on the number of levels, while in DM slope overload distortion is present.

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