Decoding device and method, audio signal processing device and method, and program

A technology for decoding equipment and audio signals, used in speech analysis, instruments, etc., can solve problems such as data errors, cannot be decoded correctly, poor sound quality, etc., and achieve the effect of simple encoding or decoding

Inactive Publication Date: 2014-12-10
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a packet disappears during transmission, or if there is a data error, not only the frame with the data error but also the next frame cannot be decoded correctly, and the sound quality becomes worse due to intermittent sound, etc.

Method used

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  • Decoding device and method, audio signal processing device and method, and program
  • Decoding device and method, audio signal processing device and method, and program
  • Decoding device and method, audio signal processing device and method, and program

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no. 1 approach

[0055] [Characteristics of this technology]

[0056] First, features of the present technology shown as the first embodiment are described.

[0057] This technique is to easily obtain an interpolation signal (substitute signal) with less inconsistency by a smaller amount of calculation in the case where an error occurs due to disappearance of a transmission data packet when decoding encoded audio data (audio signal) . Specifically, the present technology has the following features (1) to (7).

[0058] (1)

[0059] A method and apparatus for interpolating an audio signal by thinning out and storing frame data of an input signal when a frame disappears, and generating an interpolated signal for the missing frame based on the previously thinned out data.

[0060] (2)

[0061] In (1), when thinning frame data, thinning processing is performed without using a high-frequency suppression filter to mix high-frequency return components into the signal.

[0062] (3)

[0063] In (1...

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Abstract

The present technique is related to a decoding device and method, an audio signal processing device and method, and a program making it possible to obtain an interpolated signal with little strangeness and a smaller calculation load. A frame-signal decoding unit decodes frame data and generates a decoded signal, and an interpolation-status assessment unit assesses interpolation status to determine a processing pattern to be performed in order to obtain an output signal on the basis of an error flag. A similar-signal detection unit extracts part of a decimation signal obtained by decimating a past output signal. An up-sampling unit up-samples the extracted decimation signal, and a smoothing unit smooths the up-sampled decimation signal and generates an interpolated signal. An output switching unit outputs any of the decoded signal, the interpolated signal, or a signal obtained by the weighted overlap-addition of the decoded signal and the interpolated signal, as an output signal according to the interpolation status. The present technique may be applied to an audio-signal processing device.

Description

technical field [0001] The present technology relates to a decoding device and method, an audio signal processing device and method, and a program, and more particularly, to a decoding device and method, an audio signal processing device and method, and a program suitable for encoding or decoding audio signals. Background technique [0002] In conventional audio encoding devices, an encoding device that performs orthogonal transformation by overlapping audio signals of adjacent blocks as in MDCT (Discrete Cosine Transform) and then encodes the audio signals is often used. [0003] Packets of data encoded by such encoding devices are transmitted. If a packet disappears during transmission, or if there is a data error, not only the frame with the data error but also the next frame cannot be decoded correctly, and the sound quality becomes worse due to intermittent sound or the like. In order to prevent such a problem, when a packet has disappeared or an error has occurred dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/005
CPCG10L19/005
Inventor 户栗康裕前田祐儿松本淳
Owner SONY CORP
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