-In a telephone system, the bandwidth of a voice channel ranges is from 300Hz to 3400Hz.
-The bandwidth allocated for a single voice frequency transmission channel is usually 4kHz,including two guard band (0-300Hz) and (3400Hz-4000Hz) to prevent adjacent frequency interference and,allowing a sampling rate of 8kHz to be used as the basic of the pulse code modulation system used for the digital PSTN.
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