Bandwidth-efficient voice activity detector

The audio signal is processed in two frequency bands, to detect active and inactive frames present in the audio signal. The voice activity classification of the audio signal is performed depending on the evaluated plurality of parameters and pre-defined validation conditions. The plurality of parameters includes low band energy, high band energy, variance, variance factor, etc. Accurate classification of proposed VAD is evaluated by comparing the bandwidth saving from standard ITU-T G.729B VAD without degrading the voice quality. This bandwidth saving reduces power consumption of a transmitting device, which increases usage time of the battery of the transmitting device.