Title :
Shaping coding noise with frequency-domain companding
Author :
Lefebvre, Roch ; Laflamme, C.
Author_Institution :
Sherbrooke Univ., Que., Canada
Abstract :
We present an approach to shape the coding noise in speech and audio coders, which is based on pre-processing and post-processing. In this approach, called spectral amplitude warping (SAW), the coding noise is shaped by applying companding to the amplitudes of the Fourier spectrum prior to and after encoding. An important advantage of this method is that signal adaptive noise shaping is accomplished by using a constant companding function, thus requiring no additional information to be sent to the decoder
Keywords :
Fourier transforms; adaptive signal processing; audio coding; compandors; decoding; frequency-domain analysis; noise; spectral analysis; speech coding; Fourier spectrum amplitudes; audio coders; coding noise shaping; companding; constant companding function; de-emphasis; decoder; encoding; frequency-domain companding; post-processing; pre-emphasis; pre-processing; signal adaptive noise shaping; spectral amplitude warping; speech coders; Decoding; Encoding; Noise figure; Noise level; Noise reduction; Noise shaping; Nonlinear equations; Nonlinear filters; Speech enhancement; Surface acoustic waves;
Conference_Titel :
Speech Coding For Telecommunications Proceeding, 1997, 1997 IEEE Workshop on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-4073-6
DOI :
10.1109/SCFT.1997.623896
