Definition: | a channel that provides the frequency band required for the transmission of telephone quality speech, and that operates at the original audio frequencies
NOTE 1 – A voice-frequency channel normally has a standardized frequency 300-3 400 Hz.
NOTE 2 – Signals, other than speech signals, having appropriate specified characteristics may occupy the whole or a part of a voice-frequency channel.
NOTE 3 – The use of this term to denote a wider band channel, such as one suitable for high quality sound signals, is deprecated.
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