Supercharge Your Innovation With Domain-Expert AI Agents!

Decoding apparatus and decoding method

一种解码装置、解码方法的技术，应用在音频信号的解码领域，能够解决时间分辨率时间分辨率粗糙、未检测到冲击音等问题

Inactive Publication Date: 2008-05-28
FUJITSU LTD
View PDF1 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sometimes no hit is detected even though the audio signal contains it
In this case, the time resolution according to the SBR method is coarser than that according to the AAC method

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
  • Decoding apparatus and decoding method
  • Decoding apparatus and decoding method
  • Decoding apparatus and decoding method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0037] The outline and characteristics of the decoder 100 according to the first embodiment of the present invention will be described below. As shown in FIG. 1, when the decoder 100 acquires and decodes an audio signal encoded by the High Efficiency Advanced Audio Coding (HE-AAC) method (hereinafter referred to as "HE-AAC data"), the decoder 100 converts the HE-AAC data The time range of the high-frequency component data contained in the HE-AAC data is corrected to the time range of the low-frequency component data contained in the HE-AAC data, and the high frequency that has been flattened in the time range before the correction is compensated according to the corrected time range Component power.

[0038] The time range of the high-frequency component data corresponds to a time resolution of encoding data by a Spectral Band Replication (SBR) method, and the time range of the low-frequency component data corresponds to a time resolution of encoding data by an Advanced Audio ...

no. 2 approach

[0069] The outline and characteristics of the decoder 200 according to the second embodiment of the present invention will be described below. The decoder 200 judges whether shock sounds are included based on the window data included in the HE-AAC data; if it determines that shock sounds are included, then compensates high frequency components according to the time range of low frequency components.

[0070] When an encoder (not shown, which encodes an audio signal) encodes a low-frequency component of the audio signal by the AAC method, the window data indicates a determination result of whether the audio signal contains shock noise. If the window data is LONG (long), no impact sound is included in the audio signal, which means that the time resolution (time range) of AAC data is wide. On the contrary, if the window data is SHORT (short), the audio signal contains a shock sound, which means that the time resolution (time range) of the AAC data is narrow.

[0071] In this way...

no. 3 approach

[0088] The outline and characteristics of the decoder 300 according to the third embodiment of the present invention will be described below. The decoder 300 detects a time range in which shock sounds occur based on grouping data included in HE-AAC data. The decoder 300 corrects the time range of the high frequency component based on the time range detected from the packet data, and compensates the power of the high frequency component flattened in the time range before the correction according to the time range after correction. Hereinafter, the time range detected from the packet data is referred to as a detection time range.

[0089] Packet data is data in which a single frame of an audio signal is divided into a certain number of samples (for example, 1024 samples), and is contained in HE-AAC data. For example, a single frame includes the relationship between time and power of one frame of the audio signal.

[0090] In this way, the decoder 300 can more accurately compen...

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 a decoding device and a decoding method. The decoding means decodes, into an audio signal, first encoded data which is encoded to a first time range based on a low frequency component of the audio signal, and second encoded data which is encoded in accordance with the audio signal. The low frequency components are used when generating the high frequency components of the audio signal and encoded into the second time range. In the decoding device, a high frequency component compensating unit compensates a high frequency component generated from the second encoded data based on the first time range. The decoding unit decodes the audio signal by synthesizing the high frequency component compensated by the high frequency component compensating unit and the low frequency component decoded from the first decoded data.

Description

technical field [0001] The present invention relates to decoding technology of audio signal. Background technique [0002] Recently, the High Efficiency Advanced Audio Coding (HE-AAC) method is employed to encode speech, sound and music. The HE-AAC method is an audio compression method used in principle by Moving Picture Experts Group 2nd Generation (MPEG-2) or Moving Picture Experts Group 4th Generation (MPEG-4). [0003] According to the encoding of the HE-AAC method, the low-frequency components of the audio signal to be encoded (signals involving speech, sound, and music, etc.) are encoded by the Advanced Audio Coding (AAC) method, and the audio signal is encoded by the Spectral Band Replication (SBR) method The high-frequency components are encoded. According to the SBR method, by encoding only a portion that cannot be followed by the low-frequency components of the audio signal, the high-frequency components of the audio signal can be encoded with fewer bits than usu...

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): G10L19/00G10L19/02G10L19/025G10L21/0388G10L25/90
CPCG10L19/24G10L21/038
Inventor 牧内孝志铃木政直土永义照白川美由纪
Owner FUJITSU 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