Data processing: speech signal processing – linguistics – language – Audio signal time compression or expansion
Reexamination Certificate
2005-12-20
2005-12-20
Chawan, Vijay B. (Department: 2654)
Data processing: speech signal processing, linguistics, language
Audio signal time compression or expansion
C704S241000, C704S205000, C704S268000
Reexamination Certificate
active
06978241
ABSTRACT:
An analyzer determines frequency and amplitudes of an audio signal represented by sinusoids for transmission transmitted to a receiver decoder which includes a synthesizer to reconstruct the audio signal. A pitch detector determines the pitch for transmission to the receiver along with the structure of the spectrum of the speech signal. The structure of the spectrum is often transmitted in the form of LPC parameters. To correct for frequency changes of the periodic component of an audio signal, a frequency change determiner determines a change of the frequency of the periodical component over the analysis period. This change of frequency is transmitted to the decoder for increasing the accuracy of the reconstruction of the audio signal. Further, the frequency change is only used to obtain a more accurate value of the pitch. The frequency change is determined by using a time warper which performs a time transformation such that a time transformed audio signal is obtained with a minimum frequency change.
REFERENCES:
patent: 4937873 (1990-06-01), McAulay et al.
patent: 5884253 (1999-03-01), Kleijn
Huimin Yang et al: “Pitch synchronous modulated lapped transform of the linear prediction residual of speech” Proceedings of the International Conference on Signal Processing, Oct. 12, 1998, the whole document.
Kleijn W B et al: “Interpolation of Pitch-Predictor Parameters in Analysis-By-Synthesis Speech Coders” IEEE Transactions on Speech and Audio Processing, US, IEEE Inc. New York, vol. 2, No. 1, Part I, 1994, pp. 42-54.
Sluijter R J et al: “A time warper for speech signals” Proceedings of IEEE Workshop on Speech Coding Proceedings. Model, Coders, and Error Criteria, Porvoo, Finland, Jun. 20-23, 1999, pp. 150-152, the whole document.
Janssen Augustus Josephus Elizabeth Maria
Sluijter Robert Johannes
Chawan Vijay B.
Koninklijke Philips Electronics , N.V.
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