Patent ID: 8326607

Claim:
A method of improving quality of a voice transmission, the method comprising: communicating, by a mobile device and via a first base station, a first voice signal using a wide band speech-compression algorithm; filtering the first voice signal to extract filter coefficient parameters, filtering the first voice signal including: filtering, in a first filter, the first voice signal at a first transmission rate and extracting a signal at a second transmission rate that is lower than the first transmission rate, providing the extracted signal to a non-linear element for bandwidth extension, tuning an output from the non-linear element in a second filter, providing the first voice signal and an output from the second filter to a comparator, the output of the second filter including a bandwidth extension, providing an output of the comparator, which is a difference between the first voice signal and the output of the second filter including the bandwidth extension, to a least means squared (LMS) calculator, providing an output of the LMS calculator to a filter coefficient adapter, in which coefficients in the second filter are adapted to optimize an LMS value, and providing an output from the filter coefficient adapter to the second filter; and using, by the mobile device, the extracted filter coefficient parameters to communicate, via a second base station, a second voice signal using a narrow band speech-compression algorithm.