Switched multiple sequence excitation model for low bit rate spe

Details Switched multiple sequence excitation model for low bit rate spe Switched multiple sequence excitation model for low bit rate spe

1996-07-01

1998-08-25

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704229, G10L 302

Patent

active

057992720

ABSTRACT:
An apparatus for compressing a speech signal into a compressed speech signal that is represented by a plurality of parameters. A time-varying digital filter is used to model the vocal tract. A number of LPC coefficients specify the transfer function of the filter updated on frame basis. An excitation signal is input to the filter analyzed on sub frame basis. This excitation signal includes either an adaptive vector quantiser code or a first pulse sequence, followed by a second pulse sequence. Selection logic is used to determine whether the adaptive vector quantiser code or the first pulse sequence better represents the speech signal. Based thereon, a switch selects either the adaptive vector quantiser code or the first pulse sequence. Thus, the parameters which are transmitted through a channel to a destination decoder include the LPC filter coefficients, either the adaptive vector quantiser code or the first pulse sequence, the second pulse sequence, and one bit indicating the state of the switch.

REFERENCES:
patent: 4937873 (1990-06-01), McAulay et al.
patent: 5115469 (1992-05-01), Taniguchi et al.
patent: 5195137 (1993-03-01), Swaminathan
patent: 5432883 (1995-07-01), Yoshihara
patent: 5530750 (1996-06-01), Akagiri
patent: 5553191 (1996-09-01), Minde
patent: 5596677 (1997-01-01), Jarvinen et al.
patent: 5602961 (1997-02-01), Kolesnik et al.

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