Following are the difference between PCM (pulse code modulation.) and DPCM (differential pulse code modulation)
| PCM | DPCM |
|---|---|
| The PCM stands for pulse code modulation. | The DPCM stands for differential pulse code modulation. |
| The PCM (pulse code modulation) can be use 4, 8 or 16 bit per sample. | The DPCM (differential pulse code modulation) can be use 2 or 3 bit per sample. |
| It has required highest bandwidth. | It has required small bandwidth. |
| The quantization error depends on number of levels. | Slope over load distortion and quantization noise is present. |
| The number level depends on number of bit. | It has fixed number of levels are used. |
| There is no feedback in transmitter or receiver. | The Feedback is present. |
| It is used in audio, video and telephony. | It is used in speech and video. |