Efficient High-frequency Bandwidth Extension of Music and Speech
Erik Larsen, Ronald M. Aarts, Michael Danessis · TU/e Research Portal · 2002
The use of perceptually based (lossy) audio codecs, like MPEG 1 - layer 3 (`mp3'), has become very popular in the last few years. However, at very high compression rates the perceptual quality of the signal is degraded, which is mainly exhibited as a loss of high frequencies. We propose an efficient algorithm for extending the bandwidth of an audio signal, with the goal to create a more natural sound. This is done by adding an extra octave at the high frequency part of the spectrum . The algorithm uses a non-linearity to generate the extended octave, and can be applied to music as well as speech . This also enables application to fixed or mobile communication systems .