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There are 13 names in this directory beginning with the letter V.

V-Band, also known as Q-Band, is a radio bandwidth range between 40 GHz t0 50 GHz.

VAD: Voice Activity Detector

Voice Activity Detector (VAD) is 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.


vCARD is a standard defining the format of an electronic business card. All devices supporting vCard can exchange information such as phone numbers and addresses. For instance, a user with a vCard-aware phonebook application on a handheld computer can easily transfer names and phone numbers to a vCard-aware mobile phone.

VHF: Very High Frequency

Very High Frequency (VHF) is the RF spectrum between 30 MHz and 300 MHz.

Viterbi algorithm

Viterbi algorithm is a technique for searching a decoding trellis to yield a path with the smallest distance. This is also known as maximum likelihood decoding.

VLR: Visitor Location Register

Visitor Location Register (VLR) contains all subscriber data required for call handling and mobility management for mobile subscribers currently located in the area controlled by the VLR. The VLR communicates with the HLR of the subscriber to request data about that subscriber.

VMAC: Virtual Media Access Control

Virtual Media Access Control (Virtual MAC or VMAC) is an algorithm that passively monitors the radio channel and estimates locally achievable service levels. The VMAC estimates key MAC level statistics related to service quality such as delay, delay variation, packet collision, and packet loss.


Vocoder refers to a voice encoder which is a device that codes and decodes the human voice (sound waves) into digital transmission. Higher vocoder speeds offer enhanced sound quality.

Voice Activated Dialing

Voice Activated Dialing is a feature that permits you to dial a phone number by speaking it to your wireless phone instead of punching it in yourself. The feature contributes to convenience as well as driving safety.

Voice Channel

Voice Channel is a channel used for transmission of voice data from a base station to a cellular phone (forward voice channel) or from a cellular phone to a base station (reverse voice channel).

VoxML: Voice Markup Language

Voice Markup Language (VoxML) is a technology from Motorola for creating a voice dialog with a Web site in which a user can call a Web site by phone and interact with it through speech recognition and Web site responses.

VSB: Vestigial Sideband

Vestigial sideband (VSB) is a type of amplitude modulation technique that encodes data by varying the amplitude of a single carrier frequency. Portions of one of the redundant sidebands are removed to form a vestigial sideband signal. Television broadcasts (regardless of NTSC, PAL, or SECAM analog video format) use this method if the video is transmitted in AM, due to the enormous bandwidth used. It may also be used in digital transmission, such as the ATSC-standardized 8-VSB. The Milgo 4400/48 modem used vesitigial sideband and phase-shift keying to provide 4800 bit/s transmission over a 1600 Hz channel.

VSELP: Vector Sum Excited Linear Predict

Vector Sum Excited Linear Predictive (VSELP) is a type of speech coding using an excitation signal generated from three components: the output of a long-term, pitch filter and two codebooks. VSELP was used in the IS-54 standard and operated at a rate of 8 kbps.

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