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Audio processing method and audio processor

A technology of audio processing and audio data, applied in voice analysis, instruments, electrical components, etc., which can solve the problems of ear annoying noise and increased noise problems

Inactive Publication Date: 2003-10-08
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the high compression ratios now required, clipping caused by far greater quantization errors than before results in often ear-noisy noise
With further improvements in compression ratios in the future, this type of noise problem will further increase
Therefore, we think that only relying on equipment to edit while reproducing is not enough to solve this kind of problem

Method used

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  • Audio processing method and audio processor
  • Audio processing method and audio processor
  • Audio processing method and audio processor

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Embodiment Construction

[0019] The present invention will be discussed based on preferred embodiments, which are not intended to limit the scope of the present invention but to explain the present invention. Not all features and combinations discussed in the embodiments are necessarily essential to the invention.

[0020] Fig. 4 shows the structure of an audio processing device 100 according to a preferred embodiment of the present invention. The audio processing device 100 includes a data input unit 110, a time-frequency conversion unit 112, a scaling unit 114, a sound quality analysis unit 116, a bit allocation unit 118, a quantization encoding unit 120, a bit stream generator 122, a volume adjustment unit 130, a volume A detector 132 and an output unit 134 . In terms of hardware components, the audio processing device 100 is realized by a part of an arbitrary audio device such as a CPU, a memory, a program downloaded from the memory, and the like. The description of the preferred embodiments her...

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PUM

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Abstract

The invention relates to an audio processing method and an audio processing device. The volume adjustment unit reduces the volume of the audio data. By encoding the audio data with the volume reduced in advance, the probability that the device on the reproduction side performs decoding in such a manner that the maximum number of bits is exceeded is reduced. Therefore, the volume adjustment unit needs to reduce the volume of the audio data according to the compression ratio during the process from the data input unit to the quantization and coding unit (ie, before the quantization ends).

Description

technical field [0001] The present invention relates to a method and device for processing audio data, and more particularly to a technique capable of reducing the noise of the audio data when the audio data is reproduced. Background technique [0002] In recent years, encoding of digital audio data of a high compression ratio has undergone serious research and development, and its application fields are being broadened. Especially with the widespread use of portable audio reproducing equipment, linear PCM signals generally recorded on disks such as CD (Compact Disk) are now compressed and recorded on recording media such as small semiconductor memories or small disks. Similarly, in a modern society full of information, data compression technology is absolutely indispensable, and it is hoped that the recording capacity can be saved by compressing the data that needs to be recorded, even if a large-capacity recording medium is used, such as, HD (ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/034G10L19/00H03M7/30
CPCG10L19/083
Inventor 大山達史山内英樹
Owner SANYO ELECTRIC CO LTD