Coding method and apparatus for using multi-channel audio signals

A sound signal and encoding technology, applied in the field of encoding and devices using multi-channel audio signals

Inactive Publication Date: 2004-08-04
SONY CORP
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  • Abstract
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  • Application Information

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As a result, when a signal encoded using the masking curve MCb is decoded by a deco

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  • Coding method and apparatus for using multi-channel audio signals
  • Coding method and apparatus for using multi-channel audio signals
  • Coding method and apparatus for using multi-channel audio signals

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Embodiment Construction

[0060] The preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

[0061] Fig. 5 shows an encoding device applying the encoding method of the present invention according to an embodiment of the present invention.

[0062] Specifically, the encoding device of the present invention has a band division filter 101 for dividing an input signal into a plurality of frequency bands; Window circuits 102a to 102d for multiplying the signal components by a transformation window function in units of data blocks; Gain control circuits 103a to 103d for calculating gain control functions in a plurality of divided frequency band units to perform gain control processing ; transformation circuits 104a to 104d for transforming gain-controlled signal components into frequency components; normalization circuits 105a to 105d for normalizing frequency components within the frequency band; for cutting off input signals only relevant to the ...

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Abstract

There is provided a coding method which can effectively prevent a pre-echo and a post-echo from being generated and can perform effective coding to which an psycho-acoustic model is applied. A coding apparatus according to the coding method of the present invention detects the attack and release portions of a waveform signal, and performs gain control to a waveform signal before the attack portion and the waveform signal of the release portion by using a gain control amount adaptively calculated according to the characteristics of the waveform signal. A quantization precision determination circuit determines a quantization precision by using the masking level. An window circuit and a transform circuit transform the waveform signal into a plurality of frequency components. The quantization circuit quantizes the plurality of frequency components by using the quantization precision.

Description

technical field [0001] The present invention relates to a coding method and a coding device for sound signals, in which sound signals such as digital data are coded using a so-called high-frequency coding method. Background technique [0002] Audio or sound signals are generally encoded at high frequencies using various types of methods and devices. For example, a so-called transform coding scheme (to be described below) is used. That is: a signal on a time axis is framed into units with a predetermined time period, thereby transforming the signal on the time axis of each frame into a signal on the frequency axis (spectrum transformation), and then dividing it into Multiple frequency bands whereby encoding operations are performed within each frequency band. In addition, there is so-called band division coding (subband coding: SBC) in which audio signals etc. on the time axis are not subjected to framing processing, but are divided into multiple frequency bands to be coded...

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Application Information

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IPC IPC(8): G10L19/025H04B1/66
CPCG10L19/025H04B1/665
Inventor 上野正俊宫森慎二
Owner SONY CORP
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