DPCM (JNTUA August 2021)Working Principle, Transmitter & Receiver

In this video, I have explained DIFFERENTIAL PULSE CODE MODULATION (DPCM) Working principle, DPCM Transmitter and DPCM Receiver (Reconstruction of DPCM Signal)
JNTUA August 2021 :: Draw and explain the functional block diagram of a DPCM.

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eq(nTs) is quantization error ...then q(nTs) is ?

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Low voice