Digital audio frequency coding method and device

A technology of digital audio and coding method, which is applied to electrical components, transmission systems, stereo systems, etc., to achieve the effect of reducing hardware costs, reducing execution time, and avoiding the increase in calculation amount

Inactive Publication Date: 2006-02-08
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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Problems solved by technology

Moreover, 70% of the calculation amount of the above-mentioned existing coding device comes from the psychoacoustic model and the bit allocation calculation

Method used

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  • Digital audio frequency coding method and device
  • Digital audio frequency coding method and device
  • Digital audio frequency coding method and device

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Embodiment Construction

[0056] The digital audio coding method and device of the present invention will be described in detail below with reference to the accompanying drawings.

[0057] Figure 4 It is a schematic diagram showing the construction of a digital audio coding device by way of an example of the present invention.

[0058] refer to Figure 4 , the digital audio encoding device in the present invention includes the following parts: subband filter bank 11, which divides the digital audio signal into a plurality of subbands; proportional coefficient detection device 12, divides the digital audio signal from the above subband filter bank 11 In the audio signal, the proportional coefficient of each sub-band is detected; the SMR calculation device 13 uses the proportional coefficient detected by the above-mentioned proportional coefficient detection device 12 and the absolute masking threshold to calculate the signal-to-masking ratio; the bit allocation device 14 uses the above-mentioned SMR t...

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Abstract

The invention relates to an apparatus and digital audio coding method for high-speed calculation. The inventive method comprises steps of: calculating signal-to-masking (SMR) ratio with the proportional coefficient detected from digital audio signal and absolute masking value constant; according the division calculation value between the difference of SMR and target NMR (Noise-to-Masking Ratio) and constants to allocate bits value; quantization processing on digital audio signal according to the allocated bits value and generating frame. The invention has the advantages of compressing digital audio signal at high speed.

Description

technical field [0001] The invention relates to a digital audio encoding method and device capable of high-speed calculation. Background technique [0002] With the wide application of digital audio in many fields such as communications, computers, and home appliances, the problem of how to save and transmit large amounts of data has arisen. In order to solve such problems, the MPEG-1 standard project belonging to the international standardization organization was determined in 1991; in 1994, the MPEG-2 standard project was confirmed on the basis of the original MPEG-1 standard case. [0003] In this MPEG standard, the MUSICAM (Masking-pattern adapted Universal Subband Integrated Coding And Multiplexing) method capable of realizing CD (Compact Disc) level sound quality at 128Kbps was selected as the audio coding method standard. [0004] The above-mentioned MUSICAM method is described as follows: audio is divided into multiple frequency bands (subbands) using auditory chara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/66H04S3/00
Inventor 吴铉梧
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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