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Research Article

JCR. 2020; 7(9): 1469-1473


Pulse Code Modulation Encoder

Shaheen Naaz, Shiva Pujan Jaiswal, K. Jaya Chitra.

Cited by (5)

Abstract
In this paper, a system based model of “Pulse code modulation” (PCM) has been constructed for
voice frequencies. In this, a sample and hold circuit has been constructed that uses a triggering semiconductor
switch like MOSFET that samples the voice signals at a frequency of 8 KHz. The sampling is based upon the
Nyquist criteria. An ADC circuit is implemented to quantize and digitize the output of the sample and Hold circuit.
The outputs that are obtained are converted into 8-bit digital value per sample at a frequency of 8 KHz. Pulse
Code Modulation (PCM) is the most straightforward type of waveform coding among other change forms as like
Adaptive Pulse Code Modulation (APCM), Delta Modulation Lastly, a parallel to serial converter is designed at
an accurate time without any delay. Further an 8-bit shifting register along with decade counter and flip-flops are
provided to this waveform sequentially without delay

Key words: ADC, Decade counter, Flip-Flop, PCM, Sample, Hold circuit.



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