1
H S Peter Yue, Rafi Rabipour: Methods and apparatus for noise conditioning in digital speech compression systems using linear predictive coding. Northern Telecom, C W Junkin, June 24, 1997: US05642464 (139 worldwide citation)

In methods and apparatus for processing a speech signals comprising a plurality of successive signal intervals, each signal interval containing no speech sounds is classified as a noise interval, and LPC coefficients are calculated for each noise interval based on the samples of that noise interval ...


2
H S Peter Yue, Sylvain Angrignon: Method and apparatus for performing echo cancellation. Nortel Networks, December 16, 2003: US06665402 (34 worldwide citation)

An echo cancellation device for reducing a magnitude of an echo occurring in a voice signal propagating in a channel of a communication system. The echo cancellation device is capable to selectively acquire an active operative mode and an inactive operative mode in response to a condition indicative ...