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

Coding method and apparatus for using multi-channel audio signals

A sound signal and encoding technology, applied in the field of encoding and devices using multi-channel audio signals

Inactive Publication Date: 2004-08-04
SONY CORP
View PDF2 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when a signal encoded using the masking curve MCb is decoded by a decoding device, another quantization noise will be produced than pre-echo or post-echo

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
  • Coding method and apparatus for using multi-channel audio signals
  • Coding method and apparatus for using multi-channel audio signals
  • Coding method and apparatus for using multi-channel audio signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] The preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

[0061] Fig. 5 shows an encoding device applying the encoding method of the present invention according to an embodiment of the present invention.

[0062] Specifically, the encoding device of the present invention has a band division filter 101 for dividing an input signal into a plurality of frequency bands; Window circuits 102a to 102d for multiplying the signal components by a transformation window function in units of data blocks; Gain control circuits 103a to 103d for calculating gain control functions in a plurality of divided frequency band units to perform gain control processing ; transformation circuits 104a to 104d for transforming gain-controlled signal components into frequency components; normalization circuits 105a to 105d for normalizing frequency components within the frequency band; for cutting off input signals only relevant to the ...

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

There is provided a coding method which can effectively prevent a pre-echo and a post-echo from being generated and can perform effective coding to which an psycho-acoustic model is applied. A coding apparatus according to the coding method of the present invention detects the attack and release portions of a waveform signal, and performs gain control to a waveform signal before the attack portion and the waveform signal of the release portion by using a gain control amount adaptively calculated according to the characteristics of the waveform signal. A quantization precision determination circuit determines a quantization precision by using the masking level. An window circuit and a transform circuit transform the waveform signal into a plurality of frequency components. The quantization circuit quantizes the plurality of frequency components by using the quantization precision.

Description

technical field [0001] The present invention relates to a coding method and a coding device for sound signals, in which sound signals such as digital data are coded using a so-called high-frequency coding method. Background technique [0002] Audio or sound signals are generally encoded at high frequencies using various types of methods and devices. For example, a so-called transform coding scheme (to be described below) is used. That is: a signal on a time axis is framed into units with a predetermined time period, thereby transforming the signal on the time axis of each frame into a signal on the frequency axis (spectrum transformation), and then dividing it into Multiple frequency bands whereby encoding operations are performed within each frequency band. In addition, there is so-called band division coding (subband coding: SBC) in which audio signals etc. on the time axis are not subjected to framing processing, but are divided into multiple frequency bands to be coded...

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): G10L19/025H04B1/66
CPCG10L19/025H04B1/665
Inventor 上野正俊宫森慎二
Owner SONY CORP
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