Friday, February 4, 2011

AMR: Discontinuous TX (DTX)

Mobile Battery life will be prolonged or a smaller battery could be used for a given operational duration. From the network point of view, the average required bit rate is reduced, leading to a lower interference level and, hence, increased capacity.




How to acheive DTX in AMR?

- Voice Activity Detector on TX side

- Evaluation of the background acoustic noise on the TX side

- Transmission of comfort noise information to the RX side using SID at regular intervals

- Generation of comfort noise on the RX side during periods when no normal speech frames are received.

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