Audio signal encoding apparatus and method
An audio signal coding and signal technology, which is applied in speech analysis, instruments, etc., can solve the problems of increased calculation amount, high computational complexity, and huge processing complexity, etc.
Inactive Publication Date: 2007-10-24
CANON KK
View PDF4 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Since 11 different Huffman code tables are searched during bit calculation, if all the Huffman code tables are searched, the calculation amount of bit calculation will inevitably increase
[0022] Also, the quantization error is calculated after inverse quantization in the distortion control loop, which also requires high computational complexity
Therefore, a huge processing complexity is required until the double loop converges
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
no. 1 Embodiment approach
[0065] FIG. 1 is a block diagram showing a configuration example of an audio signal encoding device according to the present embodiment. In FIG. 1, thick lines represent data signals, and thin lines represent control signals.
[0066] In the configuration shown in FIG. 1 , reference numeral 1 denotes a frame divider that divides an audio input signal into frames as processing units. The frame-divided audio input signal is sent to an auditory mental operator 2 and a filter bank 3 (described below).
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](https://static-eureka.patsnap.com/ssr/23.2.0/_nuxt/noPUMSmall.5c5f49c7.png)
Abstract
There are included a frame dividing part (1); an auditory mentality arithmetic part (2); a filter bank (3); a scale factor calculating part (4) for weighting the spectrum of each frequency band by use of an arithmetic result of the auditory mentality arithmetic part (2); a quantization step deciding part (7) for deciding a quantization step of the whole frame prior to a spectrum quantization by subtracting, from the auditory information amount of the whole weighted spectrum before the quantization, the information amount of the whole spectrum after the quantization and then multiplying the result of the subtraction by a factor obtained from a quantization roughness increment width; a spectrum quantizing part (8); and a bit shaping part (9) for providing a bitstream obtained by shaping the quantized spectrum. The quantization step deciding part (7) predicts, based on the bit amount assigned to a frame to be encoded, the information amount of the whole quantized spectrum.
Description
technical field [0001] The invention relates to an audio signal encoding device and method. Background technique [0002] In recent years, high-quality and efficient audio signal coding technology has been widely used in DVD-Video audio tracks, portable audio players, music distribution, and storage of music in home servers on home LANs, etc., and its importance is also increasing. [0003] Most of such audio signal coding techniques utilize transform coding techniques for time-frequency transformation. For example, MPEG-2AAC, Dolby Digital (AC-3), and the like use only an orthogonal transform such as MDCT (Modified Discrete Cosine Transform: Modified Discrete Cosine Transform) to form a filter bank. In addition, MPEG-1 Audio Layer III (MP3) and ATRAC (encoding method used in MD (Mini Disk)) combine multi-stage QMF (Quadrature Mirror Filter: Quadrature Mirror Filter) and other sub-band division filters. Alternate connections to form filter banks. [0004] These transform...
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
![application no application](https://static-eureka.patsnap.com/ssr/23.2.0/_nuxt/application.06fe782c.png)
IPC IPC(8): G10L19/02G10L19/035
Inventor 船越正伸
Owner CANON KK
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
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