Mani Raj Paul - PCM

What is PCM

Pulse-code modulation(PCM) is a digitally represent sampled analog signals.PCM is the standard form of digital audio in computers,& other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals

Low Pass Filter

This filter eliminates the high frequency presen in the input analog signal which was greater than the highest frequency of the signal, to avoid aliasing of the message signal.

Sampler

In Sampler technique which helps to collect the sample data  of message signal at instantaneous values,

Quantizer

Quantizing is a process of reducing the excessive bits & it also confining the data.

Encoder

In Encoder the digitization of analog signal is done by the it. It designates each quantized level by its  binary code.

Regenerative Repeater

In regenertive repeater section this increases the signal strength. Channel also has one regenerative repeater circuit in its output, to compensate the signal loss & reconstruct the signal

Decoder

It decodes the pulse coded waveform to reproduce the original signal. Then this circuit will act  a the demodulator.

Reconstruction Filter

In Reconstruction Filter digital-to-analog conversion is done by the regenerative circuit & the decoder, a low-pass filter is employed, called as the reconstruction filter to get back the original signal.

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