Definitions for "Voiceband"
A transmission channel with a nominal 4-kHz bandwidth suitable for voice transmission.
A transmission service with a Bandwidth considered suitable for transmission of Audio signals. The frequency range is generally 300/500 to 3000 Hertz.
In electronics, voiceband means the typical human hearing frequency range that is 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.