Audio bandwidth expansion method and expansion apparatus thereof

An audio bandwidth and bandwidth expansion technology, which is applied in the field of audio coding, can solve problems such as inability to adjust and poor high-frequency reconstruction of music signals, and achieve accurate high-frequency reconstruction and improve the quality of audio restoration.

Active Publication Date: 2017-09-29
SHENZHEN RES INST OF WUHAN UNIVERISTY
View PDF12 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has a good effect on the high-frequency reconstruction of the speech signal, but the effect on the high-frequency reconstruction of the music signal is not good, and it cannot make adaptive adjustments according to the type and characteristics of the signal

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
  • Audio bandwidth expansion method and expansion apparatus thereof
  • Audio bandwidth expansion method and expansion apparatus thereof
  • Audio bandwidth expansion method and expansion apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0052] Such as figure 1Shown is the method flowchart of the embodiment of the present invention, the method for audio frequency bandwidth extension, comprises the following steps:

[0053] Step 101: detect the encoding mode of the current frame signal in the hybrid ACELP / TVC core encoder to distinguish the signal type, if the encoding mode of the current frame signal in the core encoder is ACELP256, then the current frame is a speech signal; if the current fra...

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 discloses an audio bandwidth expansion method and an expansion apparatus thereof. The method comprises the following steps of detecting a coding mode of a current frame signal in a mixing ACELP/TVC core encoder so as to distinguish a signal type; based on the signal type, selecting adaptive high frequency reconstruction strategies for voice and music signals respectively; if the signal is the voice signal, adopting a bandwidth expansion method based on LPC; and if the signal is the music signal, adopting a frequency band copy bandwidth expansion method based on a high and low frequency signal correlation. The expansion apparatus comprises a signal type detection module, a voice signal bandwidth expansion module and a music signal bandwidth expansion module. In the invention, characteristics of different signal types are fully considered; and from an aspect of the signal type, audio recovery quality is increased and high frequency reconstruction can be accurately performed.

Description

technical field [0001] The invention relates to the field of audio coding, in particular to an audio bandwidth extension method and an extension device. Background technique [0002] Psychoacoustic research shows that people have different sensitivities to different frequencies of audio, and are more sensitive to low frequencies but not to high frequencies. Therefore, high frequencies are often not encoded in audio coding to save bit rates. The complete absence of the high-frequency part will bring discomfort to the sense of hearing, so bandwidth expansion is often used to restore the high frequency. LPC-based bandwidth extension technology is a representative technology with low bit rate and low complexity. It extracts the LPC parameters that characterize the high-frequency envelope, sub-band energy, and then adjusts the high-frequency low-frequency signal to complete high-frequency reconstruction. my country's self-developed mobile audio codec AVS-P10 also uses this band...

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): G10L19/00
CPCG10L19/00
Inventor 胡瑞敏姜林文彬王晓晨江游
Owner SHENZHEN RES INST OF WUHAN UNIVERISTY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap