| VAD |
voice activity detector |
The device that detects voice activity and allows DTX to operate. VAD, in conjunction with DTX reduces power consumption in the mobile station and RF interference in the system by muting the transmitter when there is no voice to transmit. |
| VHF |
Very High Frequency |
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| VLR |
Visitor Location Register |
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| VOIP |
Voice Over Internet Protocol |
A technology for transmitting ordinary telephone calls over the Internet using packet-linked routes. VoIP is not simply for voice over IP, but is designed to accommodate two-way video conferencing and application sharing as well. |
| VPN |
Virtual Private Network |
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| VSELP |
Vector Sum Excited Linear Predictive |
A type of speech coding using an excitation signal generated from three components: the output of a long term or pitch filter and two codebooks. VSELP was used in the IS-54 standard and operated at a rate of 8 kbps. |
