Communications Systems Glossary

Variable Bit Rate (VBR).  Variable bit rate is a service class for asynchronous transfer mode networks (ATM networks) in which the cell rate is allowed to vary in accordance with the connection contract.

Very high frequency (VHF).  The very high frequency (VHF) band is a radio-frequency (RF) band in the range 30-300 MHz.

Very low frequency (VLF).  The very low frequency (VLF) band is a radio-frequency (RF) band in the range 3-30 kHz.

Vestigial side band (VSB).  Single sideband (SSB) modulation is bandwidth efficient for single channel voice applications because the low frequencies in voice are not required.

Vocoder.  A vocoder is a common type of source coding is performed by the voice coder.

Voice frequency (VF).  A voice frequency (VF) is a frequency in the range produced by the human voice.

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