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Pulse Code Modulation (PCM)

Pulse Code Modulation (PCM). Analog voice data must be translated into a series of binary digits before they can be transmitted. With Pulse Code Modulation (PCM) , the amplitude of the sound wave is sampled at regular intervals and translated into a binary number.

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Pulse Code Modulation (PCM)

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  1. Pulse Code Modulation (PCM) Analog voice data must be translated into a series of binary digits before they can be transmitted. With Pulse Code Modulation (PCM), the amplitude of the sound wave is sampled at regular intervals and translated into a binary number. The difference between the original analog signal and the translated digital signal is called quantizing error.

  2. PCM

  3. PCM

  4. PCM

  5. PCM PCM uses a sampling rate of 8000 samples per second. Each sample is an 8 bit sample resulting in a digital rate of 64,000 bps (8 x 8000).

  6. Converting Samples to Bits • Quantizing • Similar concept to pixelization • Breaks wave into pieces, assigns a value in a particular range • 8-bit range allows for 256 possible sample levels • More bits means greater detail, fewer bits means less detail

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