Post-processing modifications in a parametric audio coder
نویسندگان
چکیده
This paper deals with the modifications of the audio signal in a parametric audio coder at the decoder stage. The parametric audio coder is based on the application of adaptive signal models for each audio signal component. These adaptive signal models are obtained by using different approaches so as to extract a multi-part model from the audio signal. The audio signal is supposed to be constituted by three components Transients, Sines and Noise for parametric audio coding purposes. This multi-part model (Sines + Transients + Noise) can also be utilized to obtain modifications on the signal, such as both tempo and pitch modifications. This paper explains how these modifications are accomplished by varying the coding parameters. Furthermore, the limits for both modifications to assure a high quality audio signal are presented. Key-Words: Parametric audio coding, Audio modifications, Tempo changed, Pitch changed, Effects on music.
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