Speech coder that utilizes correlation maximization to achieve f

Details Speech coder that utilizes correlation maximization to achieve f Speech coder that utilizes correlation maximization to achieve f

1995-11-17

1999-02-02

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704214, 704219, 704221, 704222, 704223, G10L 302

Patent

active

058678140

ABSTRACT:
A speech coder, formed with a digital speech encoder and a digital speech decoder, utilizes fast excitation coding to reduce the computation power needed for compressing digital samples of an input speech signal to produce a compressed digital speech datastream that is subsequently decompressed to synthesize digital output speech samples. Much of the fast excitation coding is furnished by an excitation search unit in the encoder. The search unit determines excitation information that defines a non-periodic group of excitation pulses The optimal location of each pulse in the non-periodic pulse group is chosen from a corresponding set of pulse positions stored in the encoder. The search unit ascertains the optimal pulse positions by maximizing the correlation between (a) a target group of filtered versions of digital input speech samples provided to the encoder for compression and (b) a corresponding group of synthesized digital speech samples. The synthesized sample group depends on the pulse positions available in the corresponding sets of stored pulse positions and on the signs of the pulses at those positions.

REFERENCES:
patent: 5295224 (1994-03-01), Makamura et al.
patent: 5307441 (1994-04-01), Tzeng
patent: 5327519 (1994-07-01), Haggvist et al.
patent: 5550543 (1996-08-01), Chen et al.
Atal et al, "A New Model of LPC Excitation for Producing Natural-Sounding Speech at Low Bit Rates", Acoustics Speech & Signal Processing International Conference, Bell Laboratories, 1982, pp. 614-617.
"Dual Rate Speech Coder for Multimedia Communications Transmitting at 5.3 & 6.3 kbits/s," Draft G.723, Telecommunication Standardization Sector of ITU, 7 Jul. 1995, 37 pages.

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