Saturday, March 28, 2015

The PSTN – Digitization

Voice frequency is 100 - 5000 Hz, with the main portion from 300 – 3400 Hz
Nyquist Theorem states that sampling must be done at twice the highest frequency to recreate. 4000 Hz was chosen as the maximum frequency, thus sampling at 8000 Hz

PCM = 8kHz * 8 bits per sample = 64 kbit/s

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