Patent ID: 7403892
Filing Date: 2008-07-22
Classification: H04L

Abstract:
1. A method of controlling the operation of an Adaptive Multi-Rate encoder for encoding speech signals to be sent between a first node and a second node in a wireless communication system, the encoder being operable to encode the speech signals in at least two modes having different degrees of robustness, the method comprising the steps of: sensing a first communication condition in a communication channel between the first and the second node; identifying a first mode applicable to said encoder corresponding to the first communication condition in the communication channel; storing a value indicative of the first mode in a memory, the length M of which is selected responsive to an Adaptive Multi-Rate loop delay, where M is an integer; and comparing the value indicative of the first mode to a plurality of values previously stored in the memory, each of said plurality of values being indicative of one of a set of previous modes corresponding to one of a plurality of previously sensed communication conditions wherein, compared to the plurality of previously stored values, if the value indicative of the first mode indicates that the first communication condition