What is difference in DPCM and DM?

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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