PCM (Pulse Code Modulation)

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Presentation transcript:

PCM (Pulse Code Modulation)

Modulation Modulation is the addition of information (or the signal) to an electronic or optical signal carrier.

Types of Modulation

Analog Signal

Digital signal

PCM Analog signal is converted into digital signal by using a digital code. It is the standard form of digital audio in computers, Compact Discs, digital telephony and other digital audio applications

Continued… The analog signal is first sampled at a 8-kHz sampling rate. Then each sample is quantized into 1 of 256 levels and then encoded into digital eight-bit words.

Sampling

Quantization

Encoding

PCM