NDLI: A Time Regularization Technique for Discrete Spectral Envelopes Through Frequency Derivative

Content Provider	IEEE Xplore Digital Library
Author	Degottex, G.
Copyright Year	1994
Abstract	In most applications of sinusoidal models for speech signal, an amplitude spectral envelope is necessary. This envelope is not only assumed to fit the vocal tract filter response as accurately as possible, but it should also exhibit slow varying shapes across time. Indeed, time irregularities can generate artifacts in signal manipulations or increase improperly the features variance used in statistical models. In this letter, a simple technique is suggested to improve this time regularity. Considering that time regularity is characterized by slowly varying spectral shapes among successive frames, the basic idea is to smooth the frequency derivative of the envelope instead of its absolute value. Even though, this idea could be applied to different envelope models, the present letter describes its application to the simple linear interpolation envelope. Using real speech signals, the evaluation shows that the time irregularity can be drastically reduced. Additional experiments using synthetic signals also show that the accuracy of the original envelope is not degraded by the process.
Sponsorship	IEEE Signal Processing Society
Starting Page	978
Ending Page	982
Page Count	5
File Size	748531
File Format	PDF
ISSN	10709908
Volume Number	22
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Harmonic analysis Time-frequency analysis Cepstral analysis Hidden Markov models Speech Shape Frequency estimation time regularity Amplitude spectral envelope sinusoidal model speech modeling
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Signal Processing Electrical and Electronic Engineering

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