Following are the differences between Pulse Code Modulation (PCM) and Differential Pulse Code Modulation (DPCM) based on the Following Parameters-
1. Number of Bits
PCM- It can use 4, 8 or 16 bits per sampleDPCM- Bits can be more than one but are less than PCM.
2. Transmission Bandwidth
PCM- Bandwidth required is very high as number of bits are highDPCM- Bandwidth required is lower than PCM.
3. Levels and Step Size
PCM- Number of levels are dependent on number of bits and step size is kept constantDPCM- In Differential Pulse Code Modulation (DPCM), fixed number of levels are used.
4. Quantization Error and Distortion
PCM- In pulse code modulation, quantization error depends on number of levels used.
DPCM- In differential pulse code modulation, slope overload distortion and quantization noise is present.
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5. Feedback
PCM- Feedback is not present in pulse code modulation in transmitter or receiver.
DPCM- In this case, feedback exists
6. Complexity
PCM- System of pulse code modulation is quite complex
DPCM- Differential pulse code modulation system is comparatively simple.
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