Envelope and Instantaneous Phase in Residual Representation
Document typeConference report
Rights accessOpen Access
Envelope and instantaneous phase of a real signal are two concepts mainly associated with modulation systems. In this paper is shown how envelope and lnstantaneous phase can be applied in coding systems. In particular, the envelope of t he residual provides informatton ahnut pitch ilnd energy of the signal and can be user to properly codify it. A parametric version of the envelope is taken from the residual of a s ignal and this informat ion ls used ln two different coders: an APC corleranda stochastlcally excited coder. In APC coder the residual envelope is used to quantize the prediction error providing step size and dynamlc bU assignment information. In stochastically excitec coders, the input to the synthesls filter is composecl by the product of the parametric envelope of the residual multiplied by an instantaneous phase taken from a codebook of random phases .
CitationLagunas, M. Envelope and Instantaneous Phase in Residual Representation. A: European Signal Processing Conference. "Signal processing IV: theories and applications: proceedings of EUSIPCO-88, Fourth European Signal Processing Conference, Grenoble, France, September 5-8, 1988". Grenoble: 0, p. 167-170.