Patent ID: 8352250

Claim:
A method of filtering a speech signal for speech encoding in a communications network, the method comprising: determining, by a computing device, a cut off frequency for a filter, wherein a component of the speech signal in a frequency range less than the cut off frequency is to be attenuated by the filter; receiving, at the computing device, the speech signal at the filter; determining, by the computing device, at least one parameter of the received speech signal, the at least one parameter providing an indication of an energy of the component of the received speech signal that is to be attenuated, and the at least one parameter comprising at least a pitch frequency of the speech signal; and adjusting, by the computing device, the cut off frequency based on the at least one parameter, thereby adjusting the frequency range to be attenuated, the adjusting comprising adjusting the cut off frequency to be less than or equal to the pitch frequency.