What is difference in DPCM and DM?
Sharad Jaiswal
Posted On: Sep 23, 2020
Differences are:
| DM | DPCM |
|---|---|
| It is defined as Delta Modulation. | It is defined as Differential Pulse Code Modulation. |
| Feedback only exists in the transmitter. | Feedback exists in both receiver and transmitter. |
| Step size is fixed in DM. | Number of levels fixed in DPCM. |
| It is less efficient. | It is more efficient than DM. |
| One bit is used per sample. | In this, more than one bit can be used but cannot use more than PCM. |
| It is used in applications like images and speeches. | It is used in applications like speeches and videos. |
| It usually has a low signal to noise ratio. | It has more signal to noise ratio as compared to DM. |
| It needs the lowest bandwidth. | It needs bandwidth more than DM but less than PCM. |
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