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Difference between Delta Modulation (DM) and Differential Pulse Code Modulation (DPCM)

Last Updated : 22 Nov, 2022
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Delta Modulation (DM): 
Delta modulation is associated with analog-to-digital and digital-to-analog signal conversion techniques. Delta modulation is utilized to appreciate high signal-to-noise magnitude relation. It uses one-bit PCM code to appreciate the digital transmission of the analog signal. With delta modulation, rather than transmitting a coded illustration of a sample, only one bit is transmitted, which simply indicates whether or not or not the sample is larger or smaller than the previous sample. it’s the most effective kind of simplest sort of Differential Pulse Code Modulation. The Delta modulation signal is smaller than the Pulse Code Modulation system. 

Differential Pulse Code Modulation (DPCM): 
DPCM stands for Differential Pulse Code Modulation, is same as Pulse Code Modulation technique used for reworking analog signal into digital signal. Differential Pulse Code Modulation has moderate signal to noise magnitude relation. Differential Pulse Code Modulation differs from Pulse Code Modulation as a results of it quantizes the excellence of the actual sample and expected value. that’s the reason it’s cited as differential Pulse Code Modulation(DPCM). 
DPCM transmitter and DPCM receiver operations are given below through figure: 

In the above diagram, if the signal is large then the next bit in digital data is 1 otherwise next bit is 0. 

Let’s see the difference between DM and DPCM, which are given below: 

S.NO Comparison based on DM DPCM
1. Feedback In DM, feedback exists in the transmitter. Here, feedback exists in both the transmitter and receiver.
2. signal-to-noise ratio DM has a poor signal-to-noise ratio. DPCM has a fair signal-to-noise ratio.
3. Transmission bandwidth It requires the lowest bandwidth. Here, DPCM requires less bandwidth than PCM.
4. Levels, step size In DM, the step size is fixed. While here, the number of levels is fixed.
5. Efficiency DM is less efficient than DPCM. DPCM is more efficient.
6. Number of bits 
In DM, only one bit is used per sample. Here more than one but less than PCM(Pulse Code Modulation) bits are used.
7. Quantization error and distortion Slope overload distortion and granular noise are present. Slope overload distortion and quantization noise are present.
8. Applications It is generally used in speeches and images. It is mostly used in videos and speeches.

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