Encoding device, decoding device, encoding method, decoding method, encoding program, decoding program, and recording medium

An encoding device and encoding technology are applied in the fields of encoding devices, decoding devices, encoding, decoding, encoding programs, decoding programs, and recording media to achieve the effect of high encoding efficiency

Active Publication Date: 2017-05-10
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Encoding device, decoding device, encoding method, decoding method, encoding program, decoding program, and recording medium
  • Encoding device, decoding device, encoding method, decoding method, encoding program, decoding program, and recording medium
  • Encoding device, decoding device, encoding method, decoding method, encoding program, decoding program, and recording medium

Examples

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Embodiment 1

[0034] figure 1 Represents an example of the functional structure of the periodic integrated envelope sequence generation device of the present invention, figure 2 The processing flow of the periodic integrated envelope sequence generator of the present invention is shown. The periodic integrated envelope sequence generation device 100 has a spectral envelope sequence calculation unit 120, a frequency domain transformation unit 110, a periodic analysis unit 130, a periodic envelope sequence generation unit 140, and a periodic integrated envelope generation unit 150. The input audio digital signal in the time domain is referred to as an input audio signal x(t), and a periodic integrated envelope sequence in which the amplitude spectrum envelope sequence is transformed is generated based on the frequency components of the coefficient sequence.

[0035]

[0036] The spectral envelope sequence calculation unit 120 calculates the amplitude spectral envelope sequence W[1], . . ....

Deformed example 1

[0082] [Modification 1] (Example of periodical analysis by normalization coefficient string)

[0083] figure 1 Also shown is a periodic integrated envelope sequence generation device according to Modification 1. also, figure 2 Also shown is the processing flow of the periodic integrated envelope sequence generator of Modification 1. The difference between the periodic integrated envelope sequence generation device 101 and the periodic integrated envelope sequence generation device 100 is that it also has a frequency domain sequence normalization unit 111, and the spectral envelope sequence calculation unit 121 and the periodic analysis unit 131 are different. , and the other structures are the same. Only the differences are described below.

[0084]

[0085] The spectrum envelope sequence calculation unit 121 not only calculates the amplitude spectrum envelope sequence W[1], ..., W[N], but also calculates the smoothed amplitude spectrum envelope sequence ～ W[1],..., ～...

Deformed example 2

[0097] [Modification 2] (Example of inputting information from outside)

[0098] In the case where the encoding device and the decoding device have the periodic integrated envelope sequence generation device of the present invention inside, processing units other than the periodic integrated envelope sequence generation device included in the encoding device and the decoding device may sometimes Find coefficient string X[1],...,X[N], normalized coefficient string X N [1],...,X N [N], quantized linear prediction coefficient^α p , Quantized and smoothed linear prediction coefficient^α p gamma p , Amplitude Spectral Envelope W[1],...,W[N], Smoothed Amplitude Spectral Envelope Sequence ～ W[1],..., ～ W[N], period T, indicator S, etc. In such a case, it is also possible to adopt a configuration in which at least any one of the frequency domain conversion unit, the frequency domain normalization unit, the spectral envelope sequence calculation unit, and the periodicity analysis...

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Abstract

This invention provides an encoding device and a decoding device that make it possible, with a small encoded size, to reproduce a frequency-domain envelope sequence that exhibits good approximation precision in the vicinity of a peak due to the pitch period of an audio signal. This encoding device has a periodic-combined-envelope generation unit and a variable-length-encoding unit. Said periodic-combined-envelope generation unit generates a periodic combined-envelope sequence, said periodic combined-envelope sequence being a frequency-domain sequence based on the following: a spectral-envelope sequence, said spectral-envelope sequence being a frequency-domain sequence corresponding to linear-prediction-coefficient symbols obtained from an input audio signal; and a frequency-domain period. The variable-length-encoding unit encodes a frequency-domain sequence derived from the input audio signal. This decoding device has a periodic-combined-envelope generation unit and a variable-length-decoding unit. Said periodic-combined-envelope generation unit generates a periodic combined-envelope sequence, said periodic combined-envelope sequence being a frequency-domain sequence based on the following: a spectral-envelope sequence, said spectral-envelope sequence being a frequency-domain sequence corresponding to the abovementioned linear-prediction-coefficient symbols; and the abovementioned frequency-domain period. The variable-length-decoding unit decodes a variable-length code, yielding a frequency-domain sequence.

Description

technical field [0001] The present invention relates to an encoding device, a decoding device, an encoding method, a decoding method, an encoding program, a decoding program, and a recording medium for encoding and decoding an acoustic signal using a spectral envelope of the acoustic signal. Background technique [0002] As a coding method for low-bit (for example, about 10 kbit / s to 20 kbit / s) speech signals or sound signals, DFT (Discrete Fourier Transform) or MDCT (Modified Discrete Cosine Transform), etc., for orthogonal transform coefficients are known. Adaptive encoding. For example, in the TCX (transform coded excitation) encoding method used in Non-Patent Document 1, the coefficient sequence X[1], ..., X[N] that is the expression of the input audio signal in the frequency domain is obtained. The sequence that removes the influence of the amplitude spectrum envelope (normalized sequence string X N [1],...,X N [N]), and variable-length encode it. Wherein, N in [] i...

Claims

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Application Information

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IPC IPC(8): G10L19/02G10L19/06H03M7/40
CPCG10L19/06H03M7/40G10L19/02G10L19/04G10L25/90G10L19/12
Inventor 守谷健弘镰本优原田登
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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