Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2005-06-28
2005-06-28
Dorvil, Richemond (Department: 2654)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
Reexamination Certificate
active
06912496
ABSTRACT:
Pursuant to one aspect of the invention, a prefilter module that incorporates an inverse filter is used in conjunction with an encoder. The inverse filter has an inverse frequency response of a frequency response of a filter that simulates speech having transmission path characteristics, such as telephone-channel bandwidth speech, and/or noisy speech. The inverse filter is used to compensate transmission path characteristics of an input signal. The inverse filter can be designed using several methods, such as, for example, an autoregressive model or a moving average model. Pursuant to a second aspect of the invention, a parameter preprocessor is used in conjunction with a decoder. The parameter preprocessor performs pitch rectification through use of a medium and linear filter, and updates spectral amplitudes and voicing parameter depending on the pitch rectification. The inverse filter and parameter preprocessor, used in conjunction with an encoder and decoder, respectively, improve signal processing and parameter estimation.
REFERENCES:
patent: 4283601 (1981-08-01), Nakajima et al.
patent: 5353310 (1994-10-01), Russell et al.
patent: 5749065 (1998-05-01), Nishiguchi et al.
patent: 5956683 (1999-09-01), Jacobs et al.
patent: 6512789 (2003-01-01), Mirfakhraei
P. Bhattacharya, et al.,An Analysis of the Weaknesses of the MBE Coding Scheme, Institute of Electrical & Electronics Engineers, Inc. (IEEE), International Conference on Personal Wireless Communications, Jan. 1999; p. 419-422.
Engin Erzin, et al.,Natural Quality Variable-Rate Spectral Speech Coding Below 3.0 KBPS, Lucent Technologies & Dept. of Electrical & Computer Eng. at Univ. of Cal.
Michele Jamrozik, et al.,Modified Multiband Excitation Model at 2400 BPS, Electrical & Computer Engineering at Clemson University.
Daniel W. Griffin, et al.,Multiband Excitation Vocoder, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 36, No. 8, Aug., 1988; p. 1223-1235.
Daniel W. Griffin, et al.,Signal Estimation from Modified Short-Time Fourier Transform, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-32, No. 2, Aug., 1984; p. 236-243.
John C. Hardwick, et al.,The Application of the IMBE Speech Coder to Mobile Communications, IEEE, Jul. 1991; p. 249-252.
John Makhoul,Linear Prediction: A Tutorial Review, Reprinted from Proc. IEEE, vol. 63, No. 4, p. 561-580, Apr., 1975.
Robert J. McAulay, et al.,Computational Efficient Sine-Wave Sythesis and Its Application to Sinusoidal Transform Coding, IEEE, Sep., 1988; p. 370-373.
Michael R. Portnoff,Short-Time Fourier Analysis of Sampled Speech, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-29, No. 3, Jun., 1981; p. 364-373.
Bhattacharya Puranjoy
Dummy Sangeetha
Singhal Manoj Kumar
Dorvil Richemond
Silicon Automation Systems
Storm Donald L.
Welsh & Katz Ltd.
LandOfFree
Preprocessing modules for quality enhancement of MBE coders... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Preprocessing modules for quality enhancement of MBE coders..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preprocessing modules for quality enhancement of MBE coders... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3512524