Audio signal decoding device and audio signal encoding device

A decoding device and audio coding technology, which is applied in the field of coding devices, can solve the problems of audio and music frequency band narrowing, inability to ensure sound quality, and lack of heaviness.

Inactive Publication Date: 2003-12-31
PANASONIC CORP
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the encoding device 300 configured in this way, when encoding is performed with a small amount of information, the frequency band of the reproduced audio and music will be narrowed, and there will be problems such as no thick feeling in the sense of hearing, and good sound quality cannot be ensured.

Method used

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  • Audio signal decoding device and audio signal encoding device
  • Audio signal decoding device and audio signal encoding device
  • Audio signal decoding device and audio signal encoding device

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Experimental program
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Embodiment 1

[0032] The decoding device and the encoding device in the embodiment of the present invention will be described in detail below using the accompanying drawings. figure 2It is a block diagram showing the structure of the decoding device 100 according to the first embodiment of the present invention. The decoding device 100 is a decoding device that uses the coded string encoded by the conventional coding device 300 as an input, and restores spectral information of a frequency band wider than the frequency band indicated by the coded string from the coded string, and includes a core decoding unit 102, Spectrum addition unit 103 and extension decoding unit 104 . The extended decoding unit 104 includes a cycle detection unit 105 and a harmonic generation unit 106 . The kernel decoding unit 102 decodes the low-band spectrum information indicated by the input code string. The spectrum addition unit 103 adds the low-band spectrum information output from the core decoding unit 102 ...

Embodiment 2

[0045] In Embodiment 2, the harmonic structure of the spectrum information is analyzed in advance on the encoding device, and the parameters representing the harmonic structure of the analysis result are stored in an area of ​​the encoded bit stream that is not recognized as an audio signal by the conventional decoding device , to transmit. Figure 7 It is a block diagram showing the configuration of the encoding device 700 according to the second embodiment. The coding device 700 includes a spectrum amplification unit 301 , a spectrum quantization unit 302 , a harmonic structure analysis unit 701 , a Huffman coding unit 702 and a code string transmission unit 703 . In the encoding device 700, the spectrum amplification unit 301 and the spectrum quantization unit 302 are the same as those of the conventional encoding device 300, and since they have already been described, the following description will be omitted. The harmonic structure analysis unit 701 analyzes the spectrum...

Embodiment 3

[0054] Figure 11 It is a block diagram showing the configuration of the decoding device 1100 according to the third embodiment. This decoding device 1100 is composed of a core decoding unit 102 , a spectrum adding unit 103 , and an extension decoding unit 1101 . The extension decoding unit 1101 includes a cycle detection unit 105 , a decoding unit 1102 , and a harmonic generation unit 1103 . Embodiment 3 differs from Embodiment 1 and Embodiment 2 in that the input to the extended decoding unit 1101 is spectrum information and code strings. Therefore, the operation of the extension decoding unit 1101 will be described below.

[0055] The code string input to the extended decoding unit 1101 is a coefficient (band gain) corresponding to a band average amplitude obtained by summing up spectral information of frequency bands (low bands) decoded by the core decoding unit 102 . The existing encoding device 300 may output the encoded string to the decoding device 1100 . The decod...

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Abstract

A decoding device (100) is a decoding device that generates frequency spectral data from an inputted encoded audio data stream, and includes: a core decoding unit (102) for decoding the inputted encoded data stream and generating lower frequency spectral data representing an audio signal; and an extended decoding unit (104) for generating, based on the lower frequency spectral data, extended frequency spectral data indicating a harmonic structure, which is same as an extension along the frequency axis of the harmonic structure indicated by the lower frequency spectral data, in a frequency region which is not represented by the encoded data stream.

Description

technical field [0001] The present invention relates to an encoding device for encoding audio signals such as sound signals and music signals by using methods such as orthogonal transform, converting signals from time domains to frequency domains, and encoding them with fewer code strings to perform information compression; and The codestring is the input to the decoding device that stretches the information. Background technique [0002] Many methods of encoding and decoding audio signals have been developed so far. In particular, IS13818-7, which is internationally standardized by ISO / IEC, has recently been approved among these methods, and is evaluated as a coding method with high sound quality and high efficiency. This encoding method is called AAC. In recent years, the above-mentioned AAC has also been adopted in the standardization called MPEG4, and the MPEG4-AAC method with some extended functions is specified for the above-mentioned IS13818-7. This is described in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/038
CPCG10L21/038
Inventor 泽岛峰生则松武志田中直也西尾孝祐
Owner PANASONIC CORP
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