Everything about Voiceband totally explained
In
electronics,
voiceband means the typical human hearing frequency range that's from 20 Hz to 20 kHz. In
telephony, it means the frequency range normally transmitted by a
telephone line, generally about 200–3600 Hz.
Frequency-division multiplexing in telephony normally uses 4 kHz carrier spacing. The rate at which the amplitude of a signal drops off near the upper and lower limits can vary with the design of the
band-pass filters.
The question of frequency spacing was addressed at an international meeting in the 1930s. Germany and Britain favored 2 kHz spacing, while the Netherlands and some other countries preferred 6 kHz. The question was compromised at the American position, which was the 4 kHz spacing that remained standard and also fixed the standard
PCM sample rate at 8 kHz, which in turn defines what "voiceband" means for this purpose. The abandonment of
in-band signaling in the late 20th century made available a larger voiceband for modems and voices.
Further Information
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