Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and apparatus for encoding or decoding a speech and/or non-speech audio input signal

A technology of input signal and voice coding, which is applied in voice analysis, code conversion, instruments, etc., can solve problems such as non-optimal quality, and achieve the effect of excellent codec quality

Inactive Publication Date: 2009-12-30
THOMSON LICENSING SA
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, permanently using the core encoder (i.e. the speech encoder), which results in sub-optimal quality for music-like (non-speech) signals

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for encoding or decoding a speech and/or non-speech audio input signal
  • Method and apparatus for encoding or decoding a speech and/or non-speech audio input signal
  • Method and apparatus for encoding or decoding a speech and/or non-speech audio input signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] in accordance with figure 1 In the joint speech and audio codec of the present invention, known coding processes for speech-like signals (speech coding processes based on linear prediction, such as CELP, ACELP, cf. ISO / IEC 14496-3, divisions 2 and 3, and MPEG4-CELP) combined with time-frequency transform based state-of-the-art encoding processes (eg MDCT) for ordinary audio or music-like signals. In step / stage 10, the PCM audio input signal IS is transformed by a Modulated Lapped Transform (MLT) having a predetermined length. As a special processing of MLT, such as Modified Discrete Cosine Transform (MDCT), it is suitable for audio coding applications. MDCT was originally called "Oddly-stacked Time Domain AliasCancellation Transform" by Princen and Bradley, and is disclosed in "Analysis / synthesis filter bank design based on time domainaliasing cancellation" by John P. Princen and Alan B. Bradley, IEEE Transactions on Acoustics Speech Sigal Processing ASSP-34(5), pp.11...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A disadvantage of known audio or speech codecs is a clear dependency of the coding quality on the types of content, i.e. music-like audio signals are best coded by audio codecs and speech-like audio signals are best coded by speech codecs. No known codec is holding a dominant position for mixed speech / music content. The inventive joined speech / audio codec uses speech coding processing as well as audio coding processing. Transform based audio coding processing is combined in an advantageous way with linear prediction based speech coding processing, using at the input a Modulated Lapped Transform the output spectrum of which is separated into frequency bins (low frequencies) assigned to the speech coding and the remaining frequency bins (high frequencies) are assigned to the transform-basedaudio coding. The invention achieves a uniform good codec quality for both speech-like and music-like audio signals, especially for very low bit rates but also for higher bit rates.

Description

technical field [0001] The present invention relates to methods and devices for encoding or decoding speech and / or non-speech audio input signals. Background technique [0002] Various wideband or speech / audio codecs are known, for example: [0003] "ITU-T G.729.1: An 8-32 Kbit / s scalable coder interoperable with G.729 for wideband telephony and voice over IP" by S.Ragor et al., IEEE International Conference on Acoustics, Speech and Signal Processing 2007, ICASSP 2007, vol.4, pp. IV-529 to IV-532. The wideband vocoder includes an embedded G.729 vocoder which is permanently used. Therefore, the quality of music-like signals (non-speech) is not very good. Although this encoder uses transform coding techniques, it is a speech encoder. [0004] "A two stage hybrid embedded speech / audiocoding structure" by S.A. Ramprashad, Proceedings of the 1998 IEEE International Conference on Acoustics, Speech, and Signal Processing 1998, ICASSP 1998, vol.1, pp.337-340. The encoder uses a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02H03M7/30G11B7/24G10L19/04G10L19/24G10L25/78
CPCG10L19/04G10L19/0212G10L19/24G10L25/78
Inventor 奥利弗·威伯特约翰尼斯·伯姆
Owner THOMSON LICENSING SA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com