Check patentability & draft patents in minutes with Patsnap Eureka AI!

Audio coding and decoding device and coding and decoding method

A technology for audio codec and signal conversion, which is applied in the field of audio codec devices and can solve problems such as large amount of computation and high complexity

Active Publication Date: 2009-09-30
SPREADTRUM COMM (SHANGHAI) CO LTD
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current technology, MDCT has high complexity and requires a large amount of calculation

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 coding and decoding device and coding and decoding method
  • Audio coding and decoding device and coding and decoding method
  • Audio coding and decoding device and coding and decoding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] figure 1 Shown is a schematic structural diagram of an audio coding and decoding device according to an embodiment of the present invention. As shown in the figure, the audio codec device 10 of the embodiment of the present invention includes a judgment module 101 and an arithmetic module 103. The judgment module 101 is used to determine that the number of received signals to be converted is 2 i ×3 j , I and j are integers; the arithmetic module 103 is used to decompose the signal to be transformed into a recursive decomposition of the signal to be transformed into 3 j Point discrete cosine transform; and the 3 j The point discrete cosine transform transform is decomposed into a 3-point discrete cosine transform by recursive decomposition of the j-order base-3.

[0022] The operation module 103 further includes a butterfly operation module 1031 a...

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 embodiment of the invention discloses an audio coding and decoding method, which comprises the following steps: determining the number of received signals to be transformed to 2*3<j>, wherein i and j are integers; and performing 2-based recursive decomposition on the signals to be transformed for i times to decompose the signals to be transformed into 3<j> point discrete cosine transform, and then performing 3-based recursive decomposition on the signals to be transformed for j times to decompose the signals to be transformed into 3 point discrete cosine transform. The embodiment of the invention also discloses an audio coding and decoding device, which can realize a unit structure for unified realization of 2 point and 3 point discrete cosine transform so as to make the unified unit structure realize 2*3<j> point discrete cosine transform finally. The audio coding and decoding method and the audio coding and decoding device can improve the performance for realizing an audio coding and decoding system, reduce power consumption, simultaneously realize any 2*3<j> signal to be transformed through the 2 point and 3 point discrete cosine transform, and complete the unified realization of various audio standards.

Description

Technical field [0001] The invention relates to digital signal processing, in particular to an audio coding and decoding device and a coding and decoding method. Background technique [0002] There are multiple standards for current audio signal formats, such as MP3 (MPEG Audio Layer 3), AAC (Advanced Audio Coding), AAC+, AAC++, WMA (Windows Media Audio) and Real Audio. The current audio standards all use MDCT (Modified Discrete Cosine Transform) / IMDCT (Inverse Modified Discrete Cosine Transform) as signal time-frequency and frequency-time conversion methods. [0003] The US patent application US2008 / 65373 discloses an audio coding device and method. The audio coding device can keep the delay in a relatively small range and alleviate the inter-frame distortion. The device and method mentioned MDCT. However, in the current technology, MDCT has high complexity and requires a large amount of calculation. [0004] In view of the foregoing reasons, embodiments of the present invention...

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): G10L19/02G10L19/16
Inventor 李昙张本好黄鹤云林福辉
Owner SPREADTRUM COMM (SHANGHAI) 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