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Encoding device, decoding device, fricative determination device, and method and program thereof

A coding device, fricative technology, applied in speech analysis, code conversion, instruments, etc., can solve problems such as inability to obtain

Active Publication Date: 2020-08-28
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the encoding unit 32 cannot obtain codes corresponding to samples to which bits are not allocated.

Method used

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  • Encoding device, decoding device, fricative determination device, and method and program thereof
  • Encoding device, decoding device, fricative determination device, and method and program thereof
  • Encoding device, decoding device, fricative determination device, and method and program thereof

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Experimental program
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no. 1 approach ＞

[0040] The system of the first embodiment includes an encoding device and a decoding device. The encoding device encodes a time-domain audio signal input in frame units of a predetermined time length, obtains and outputs codes. The code output by the encoding means is input to the decoding means. The decoding device decodes the input code and outputs an audio signal in the time domain in units of frames. The sound signal input to the encoding device is, for example, a sound signal or an acoustic signal obtained by collecting sound such as speech or music with a microphone and performing AD conversion. In addition, the audio signal output from the decoding device can be listened to by being reproduced by a speaker, for example, through DA conversion.

[0041]"Coding Device"

[0042] refer to figure 1 , the processing procedure of the encoding device of the first embodiment will be described. Such as figure 1 As exemplified in , the encoding device of the first embodimen...

no. 2 approach ＞

[0148] The system of the second embodiment of the present invention includes an encoding device and a decoding device similarly to the system of the first embodiment.

[0149] The second embodiment differs from the first embodiment in that the decoding device restores the frequency spectrum of which bits are not allocated in the encoding device, that is, the decoding device expands the frequency band. The decoding device according to the second embodiment expands the frequency band of the decoded adjusted spectrum sequence which is the spectrum converted based on the fricative noise determination information. In the frequency spectrum to which bits are not allocated in the encoding device, the time intervals of non-fricative sounds are included in the high range, and the time intervals of fricative sounds are included in the low range. Therefore, in the second embodiment, for the time interval of non-fricative sound, the frequency band is expanded by reproducing the spectrum o...

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Abstract

This encoding device, which includes an encoding unit 14 that performs encoding with an encoding process for preferentially allocating a bit to a low frequency band side and obtains a spectral code, further includes: a fricative determination unit 12 which determines whether a sound signal is a fricative sound; and a fricative adjustment unit 13 which, when the fricative determination unit 12 determines that the sound signal is a fricative sound, obtains, as an adjusted frequency spectral series, a result of exchanging the entirety or a part of a low frequency band-side frequency spectral series, the frequency of which is lower than a prescribed frequency in a frequency spectral series of the sound signal, and the entirety or a part of a high frequency band-side frequency spectral series which has the same number of frequency spectra as the lower frequency spectral series, the frequency of which is higher than the prescribed frequency in the frequency spectral series of the sound signal, wherein the encoding unit 14 encodes the adjusted frequency spectral series.

Description

technical field [0001] The present invention relates to a technique for encoding or decoding a sample string derived from a frequency spectrum of an audio signal in signal processing techniques such as an encoding technique for an audio signal, and a technique for determining fricative sounds used for encoding, for example. Background technique [0002] When compressing and encoding an audio signal, in order to improve the compression efficiency, the audio signal is conventionally represented as a spectral string, and bit allocation is performed on the spectral string in consideration of the importance of auditory perception. The bit allocation in consideration of the importance of auditory perception is performed by preferentially allocating bits to samples corresponding to low frequencies in the spectrum string, or the like. As a result, fewer bits are allocated to samples corresponding to high frequencies in the spectrum string, or no bits are allocated at all. In the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/032G10L19/002G10L19/20G10L25/18
CPCG10L19/032G10L19/20G10L25/18G10L25/51G10L25/93G10L2025/937G10L19/0204G10L19/002G10L19/265G10L21/0232H03M7/6005H03M7/6011
Inventor 杉浦亮介镰本优守谷健弘
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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