Formant weighted vector quantization of LPC excitation harmonic

Details Formant weighted vector quantization of LPC excitation harmonic Formant weighted vector quantization of LPC excitation harmonic

1998-05-19

2000-08-01

Knepper, David D.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 704222, 704230, G10L 1902

Patent

active

060980370

ABSTRACT:
A method of quantizing harmonic amplitudes (FIG. 3), used in a speech encoder (10). The method compares variable dimension input vectors to fixed dimension codebook vectors, by first sampling each codebook vector so that it is converted to a vector having the same dimension as the input vector (FIG. 3, step 35). The resulting codebook vector is compared to the input vector (step 37). The difference (error) is weighted in favor of low frequency harmonics. Also, the weighting favors formant amplitudes so that they are quantized more accurately than formant nulls (FIG. 3, step 38; FIG. 5).

REFERENCES:
patent: 4975956 (1990-12-01), Liu et al.
patent: 5012518 (1991-04-01), Liu et al.
patent: 5384891 (1995-01-01), Asakawa et al.
patent: 5630011 (1997-05-01), Lim et al.
patent: 5680507 (1997-10-01), Chen
patent: 5754974 (1998-05-01), Griffin et al.
patent: 5809459 (1998-09-01), Bergstrom et al.
J.C. Hardwick "A 4.8 kb/s Multi-Band Excitation Speech Coder", S.M. Thesis, E.E.C.S. Department, M.I.T., 1988, pp. 36-57.
A. Das, A. Rao, A. Gersho "Variable Dimension Vector Quantization of Speech Spectra for Low Rate Vocoders", Proc. IEEE Data Compression Conf., Apr. 1994, pp: 420-429.
V. Cuperman, P. Lupini, B. Bhattacharya "Spectra Excitation Coding of Speech at 2.4 kb/s", Proc. ICASSP, 1995, pp: 496-499.

Affiliated with

Also associated with

Rating

Formant weighted vector quantization of LPC excitation harmonic does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Formant weighted vector quantization of LPC excitation harmonic , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formant weighted vector quantization of LPC excitation harmonic will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-673275