Noun
voiceband (uncountable)
(electronics) The range of frequencies typically audible to humans, from about 20 Hz to 20 kHz.
For example, in voiceband speech coding, only information in the frequency band 400 Hz to 3500 Hz is transmitted but the reconstructed signal is still adequate for intelligibility. Source: Internet
The local loop was originally intended mostly for the transmission of speech, encompassing an audio frequency range of 300 to 3400 hertz ( voiceband or commercial bandwidth ). Source: Internet
In the 1950s negative impedance gain devices were more popular, and a transistorized version called the E6 repeater was the final major type used in the Bell System before the low cost of digital transmission made all voiceband repeaters obsolete. Source: Internet
However, as long-distance trunks were gradually converted from analog to digital operation, the idea of being able to pass data through the local loop (by utilizing frequencies above the voiceband) took hold, ultimately leading to DSL. Source: Internet