The invention provides a method and an apparatus for synthetic widening of the bandwidth of voice signals. This is done by providing a narrowband voice signal at a predetermined sampling rate; carrying out analysis filtering on the sampled voice signal using filter coefficients, which are estimated from...http://www.google.de/patents/US20030050786?utm_source=gb-gplus-sharePatent US20030050786 - Method and apparatus for synthetic widening of the bandwidth of voice signals
