公开(公告)号：JPH10207497A

公开(公告)日：1998-08-07

申请号：JP34986497

申请日：1997-12-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LAROIA RAJIV ,  YEO BOON-LOCK

IPC: G10L19/04 ,  G10L19/02 ,  G10L19/06 ,  H03M7/30 ,  H04B14/04 ,  G10L9/14

Abstract: PROBLEM TO BE SOLVED: To improve a short period characteristic of a voice signal perceptively keeping improved coding efficiency by coding a short period frequency spectrum of a voice signal by a coding resource being equal to a correspondent frequency affecting to sense quality of a synthesized voice signal. SOLUTION: A voice pattern like a talked message is received by a microphone transducer 5 generating a correspondent analog voice signal. This analog voice signal is converted to a sequence of pulse sample band-limitted by a filter and a sampler circuit 10. After that, each voice sample is converted to amplitude indicating a sequence (digitized voice) S(n) of a digital code by an A/D converter 15. The digitized voice S(n) is supplied to a short period frequency spectrum processor 20, then, a correspondent short period spectrum characteristic is decided from the digitized voice S(n), and coded.

公开(公告)号：DE69703233D1

公开(公告)日：2000-11-09

申请号：DE69703233

申请日：1997-12-02

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LAROIA RAJIV ,  YEO BOON-LOCK

IPC: G10L19/04 ,  G10L19/02 ,  G10L19/06 ,  H03M7/30 ,  H04B14/04 ,  G10L101/20

Abstract: Coding systems that provide a perceptually improved approximation of the short-term characteristics of speech signals compared to typical coding techniques such as linear predictive analysis while maintaining enhanced coding efficiency. The invention advantageously employs a non-linear transformation and/or a spectral warping process to enhance particular short-term spectral characteristic information for respective voiced intervals of a speech signal. The non-linear transformed and/or warped spectral characteristic information is then coded, such as by linear predictive analysis to produce a corresponding coded speech signal. The use of the non-linear transformation and/or spectral warping operation of the particular spectral information advantageously causes more coding resources to be used for those spectral components that contribute greater to the perceptible quality of the corresponding synthesized speech. It is possible to employ this coding technique in a variety of speech coding techniques including, for example, vocoder and analysis-by-synthesis coding systems.

公开(公告)号：DE69703233T2

公开(公告)日：2001-02-22

申请号：DE69703233

申请日：1997-12-02

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LAROIA RAJIV ,  YEO BOON-LOCK

IPC: G10L19/04 ,  G10L19/02 ,  G10L19/06 ,  H03M7/30 ,  H04B14/04 ,  G10L101/20

Abstract: Coding systems that provide a perceptually improved approximation of the short-term characteristics of speech signals compared to typical coding techniques such as linear predictive analysis while maintaining enhanced coding efficiency. The invention advantageously employs a non-linear transformation and/or a spectral warping process to enhance particular short-term spectral characteristic information for respective voiced intervals of a speech signal. The non-linear transformed and/or warped spectral characteristic information is then coded, such as by linear predictive analysis to produce a corresponding coded speech signal. The use of the non-linear transformation and/or spectral warping operation of the particular spectral information advantageously causes more coding resources to be used for those spectral components that contribute greater to the perceptible quality of the corresponding synthesized speech. It is possible to employ this coding technique in a variety of speech coding techniques including, for example, vocoder and analysis-by-synthesis coding systems.