Supercharge Your Innovation With Domain-Expert AI Agents!

Method for extracting direct sound and background sound, loudspeaker system and sound playback method

An extraction method, background sound technology, applied in instruments, speech analysis, etc.

Active Publication Date: 2018-12-18
COLSONIC SUZHOU ELECTRONICS CO LTD
View PDF12 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is calculated from the time domain, the method is simple, and the calculation speed is fast, but only one surround signal can be separated through PCA analysis, and the method of separating the left rear and right rear surround with a decorrelation filter will produce a certain error

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 for extracting direct sound and background sound, loudspeaker system and sound playback method
  • Method for extracting direct sound and background sound, loudspeaker system and sound playback method
  • Method for extracting direct sound and background sound, loudspeaker system and sound playback method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0064] This embodiment provides a method for extracting direct sound and background sound, referring to figure 1 As shown in the signal flow chart, the extraction method includes the following steps:

[0065] S1, the left channel signal x L (n) and right channel signal x R (n) Perform short-time Fourier transform (STFT) to obtain X corresponding t...

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

The invention relates to a method for extracting direct sound and background sound, wherein the direct sound and the background sound can be well distinguished. The invention further relates to a loudspeaker system and a sound playback method. The method for extracting the direct sound and the background sound comprises the following steps of S1, performing short-time Fourier transform on a left channel signal xL(n) and a right channel signal Xr(N) for obtaining an XL(m,k) and XR(m,k) which respectively correspond with the left channel signal and the right channel signal, wherein n representsa time domain sampling point, and m and k respectively represent discrete time and discrete frequency; S2, introducing a space factor, representing a background sound signal as signals which are generated by one signal in different transmission paths in one room, and performing energy estimation on the XL(m,k) and the XR(m,k), thereby obtaining the energy PL(m,k) and PR(m,k) of the left channel and the right channel; S3, setting the value of the space factor, performing signal separation for obtaining estimation S<^>(m,k) of the direct sound signal of a time frequency domain, estimation NL<^>(m,k) of the background sound signal of the left channel, estimation NR<^>(m,k) of the background sound signal of the right channel; and S4, performing inverse Fourier transform for obtaining a directsound signal s<^>(n), the left channel background sound signal nL<^>(n) and the right channel background sound signal nR<^>(n) of the time domain.

Description

technical field [0001] The invention relates to a method for converting a stereo two-channel signal into a multi-channel signal, in particular to a method for extracting direct sound and background sound based on frequency domain space decomposition, a loudspeaker system and a sound reproduction method thereof. Background technique [0002] At present, most audio sources are still stereo, including CD, MP3, broadcasting signals, etc. are dual-channel output, only left and right channels (L, R), all characteristic information, such as direct sound signal, reverberation sound signal, sound source The position, the size of the sound field space, etc. are included in the two channels. When multiple speakers are used to reproduce a stereo sound source, if the left and right channel signals are directly fed to each speaker, it will cause confusion in the spatial sound field. Therefore, it is necessary to use digital signal processing technology to convert the stereo signal into 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
IPC IPC(8): G10L21/0272
CPCG10L21/0272
Inventor 叶超蔡野锋马登永沐永生
Owner COLSONIC SUZHOU ELECTRONICS CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com