Parametric envelope in LPC speech coders
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During the last decade, many efforts have been devoted to the relative importance of associated functions like magnitude and phase of Fourier Transforms in image and signal bandwidth reduction. The reported work deals with the importance of the real envelope and instantaneous frequency in signal analysis/sintesis problems. In this paper authors show a method to parametrize the envelope and instantaneous frequency of a real signal. This method is very closed to spectral analysis methods in the sense that with an appropiate study, time domain and frequency domain can be analyced in a similar way.
CitacióMoreno, A., Lagunas, M., Vallverdu, F. Parametric envelope in LPC speech coders. A: Mediterranean Electrotechnical Conference. "MELECON 1985: Proceedings of MELECON '85: Mediterranean Electrotechnical Conference: Madrid, Spain: October 8-10, 1985". Madrid: 1985, p. 107-110.