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

Audio bandwidth expansion coding and decoding devices

An audio bandwidth and extended coding technology, applied in the audio field, can solve the problems of insufficient consideration and utilization, insufficient consideration and utilization of high and low frequency correlation, etc., and achieve the effect of improving the quality of output audio signals and improving the quality of audio decoding.

Active Publication Date: 2009-09-02
WUHAN UNIV
View PDF0 Cites 76 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing bandwidth expansion technology does not fully consider and utilize the nonlinear perception characteristics of human ear perception characteristics, and does not fully consider and utilize the correlation between high and low frequencies

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 coding and decoding devices
  • Audio bandwidth expansion coding and decoding devices
  • Audio bandwidth expansion coding and decoding devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] see figure 1 , the bandwidth extension technical solution provided by the present invention includes an audio bandwidth extension encoding device, comprising the following parts:

[0032] A frequency division module is used to divide the input broadband signal into a high frequency signal and a low frequency signal;

[0033] The core encoder module is used to obtain low-frequency parameters according to the low-frequency signal obtained by the frequency division module, and obtain audio type parameters, low-frequency spectrum envelope parameters and low-frequency residuals;

[0034] The linear predictive analysis module is used for linear predictive analysis of the high-frequency signal obtained by the frequency division module to obtain high-frequency spectrum envelope parameters and high-frequency residuals;

[0035] The high-spectrum envelope quantization module is used to obtain high-spectrum envelope parameters and high-spectrum envelope indexes after quantization...

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 provides audio bandwidth expansion coding and decoding devices which can reconstruct a high frequency signal by using the lower code rate so as to improve the quality of the output audio signal. The audio bandwidth expansion coding device comprises a frequency division module, a core coder module, a linear prediction analysis module, a spectrum envelope quantization module, a high and low frequency correlation computation module and a gain computation module; and the audio bandwidth expansion decoding device comprises a core decoder module, a high-frequency spectrum envelope reconstruction module, a high-frequency residual error reconstruction module, a high-frequency gain adjustment module, a high-frequency signal synthesis module and a wideband signal reconstruction module.

Description

technical field [0001] The invention belongs to the field of audio technology, in particular to an audio bandwidth extension codec device. Background technique [0002] Studies on the human auditory system have shown that the human ear is highly sensitive to low-frequency signals (300-3400Hz), and the quantization error that can be tolerated is small, while the sensitivity to high-frequency signals is low, and the quantization error that can be tolerated is small. Big. This feature is widely used in audio compression technology. Due to the limited network bandwidth, the bit rate of transmission cannot be too high, so full-band encoding is not possible; in order to avoid aliasing of the signal spectrum, in the process of sampling and quantizing the analog signal to obtain a digital signal, only the lower than the sampling rate of the original signal can be retained. Low-frequency components at half the frequency. According to the characteristics of the human auditory syste...

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): G10L19/04G10L19/00
Inventor 胡瑞敏杭波方圆马晔王晓晨周成
Owner WUHAN UNIV
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