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Encoding method and encoding device

An encoding method and encoding technology, applied in the fields of encoding methods and encoding devices, can solve the problems of increasing the number of cycles and the like

Inactive Publication Date: 2009-05-13
SONY CORP
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Problems solved by technology

If the absolute value of the difference between the final value and the initial value of the public scale factor is large, it causes an increase in the number of loops

Method used

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  • Encoding method and encoding device
  • Encoding method and encoding device
  • Encoding method and encoding device

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Embodiment Construction

[0051] Next, embodiments of the present invention are described with reference to the drawings. refer to figure 1 , the structure of the embodiment of the present invention will be described. A digital audio signal extracted as blocks having a predetermined size is input to an input terminal 1 . The input audio signal is supplied to the filter combining section 2 . The filter combining unit 2 transforms the time-domain signal into a frequency-domain signal according to orthogonal transform such as MDCT. The orthogonally transformed signal is divided into a plurality of subbands. Compute subband scale factors for each subband and perform normalization to configure their dynamic range.

[0052] The psychoacoustic analysis section 3 appropriately assigns bits to each subband using the psychoacoustic characteristics of people. The output signal of the filter combination section 2 is supplied to the quantization section 4 . The quantization section 4 quantizes the MDCT coeff...

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Abstract

At S1, an initial value of a common scale factor is calculated. Thereafter, at S11, the initial value is corrected. A value of which the difference between the initial value and the final value of the preceding frame is added to the initial value of the current frame is a corrected initial value of the common scale factor. Scaling is performed with the corrected initial value. At S3, if it has been determined that quantizing noise of each sub band do not exceed a permissible noise, the flow advances to S5. At S5, variable length encoding is performed. At S6, it is determined whether or not the encoded code amount exceeds a target code amount. If it has been determined that the code amount exceed the target code amount, the flow advances to S7. At S7, the common scale factor is changed such that the quantizing step size becomes large and the quantizing process is restored. Thereafter, the process is repeated until it has been determined that the code amount do not exceed the target code amount. The corrected initial value allows the process time to become short.

Description

technical field [0001] The present invention relates to an encoding method and encoding apparatus for compressing a code amount of a digital information signal such as an audio signal. Background technique [0002] As one encoding method for compressing audio signals, ISO / IEC 13818-78 (hereinafter referred to as MPEG2-AAC (Advanced Audio Coding) of AAC audio encoding) standardized by ISO is known. [0003] In AAC audio encoding, a music signal or the like is divided into a plurality of time blocks. Orthogonal transform such as modified discrete cosine transform (hereinafter referred to as MDCT (modified DCT)) is performed on each block, thereby obtaining transform coefficients (hereinafter referred to as MDCT coefficient). The MDCT coefficients are scaled by a scaling factor. The scaled transform coefficients are quantized and the quantized values ​​are encoded according to the Huffman coding system. [0004] In AAC audio coding, when transform coefficients are divided in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02H03M7/30G10L19/035
CPCG10L19/0212G10L19/035G10L19/0208H03M7/30
Inventor 诹访部薰
Owner SONY CORP
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