Audio bandwidth extension coding and decoding method and device based on deep neutral network

A technology of deep neural network and decoding method, which is applied in the field of audio bandwidth expansion coding and decoding method and device, and can solve problems such as poor coding quality

Active Publication Date: 2015-11-18
WUHAN UNIV
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Problems solved by technology

Aiming at the problem of poor coding quality caused by weak correlation between high and low frequency signals in the traditional method, the present invention provides an audio bandwidth extension coding and decoding method and device ba...

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  • Audio bandwidth extension coding and decoding method and device based on deep neutral network
  • Audio bandwidth extension coding and decoding method and device based on deep neutral network
  • Audio bandwidth extension coding and decoding method and device based on deep neutral network

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Embodiment Construction

[0087] In order to facilitate the understanding and implementation of the present invention by those of ordinary skill in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0088] Please see figure 1 , figure 2 with image 3 , The present invention provides a deep neural network-based audio bandwidth extension encoding and decoding method, including an encoding method and a decoding method;

[0089] Please see figure 1 , The specific implementation of the encoding method includes the following steps:

[0090] Step A1: The input signal to be processed is subjected to framing processing, and then the ultra-low frequency part with a frequency below 50 Hz (this part of the human ear has low perception); the processed signal...

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Abstract

The invention discloses an audio bandwidth extension coding and decoding method and device based on a deep neutral network. The device includes a coding unit and a decoding unit. The coding unit includes an envelope preprocessor module, a high-frequency parameter extraction module, a low-frequency coding module and a code stream generation module. The decoding unit includes a code stream input module, a high-frequency parameter decoding module, a low-frequency signal decoding module, an auto-encoder parameter prediction module, a deep neutral network fine structure prediction module, a high-frequency signal reconstruction module, and a signal synthesis module. A fine structure of a high-frequency portion is predicated through autocorrelation between a signal low-frequency portion and a signal high-frequency portion by using a deep neutral network prediction method; then, the fine structure and edge information, obtained by a coding end, of the high-frequency portion are combined, and the signal high-frequency portion is reconstructed; and finally, the signal low-frequency portion and the signal high-frequency portion are fused, and a final recovery signal is obtained. Compared with a conventional method, the method has the advantages that the code rate is greatly reduced, and the tone quality is equivalent to that of the conventional method.

Description

Technical field [0001] The invention belongs to the technical field of audio coding, and in particular relates to an audio bandwidth expansion coding and decoding method and device based on a deep neural network. Background technique [0002] As people's requirements for sound quality increase and the number of mobile terminal users continues to increase, the requirements for audio coding efficiency are also increasing. Compared with the existing audio coding methods, the audio bandwidth extension technology has the advantages of high efficiency and low bit rate. The main idea is to use the correlation between the low frequency part and the high frequency part of the signal to encode the high frequency, in order to improve the sound quality and reduce the coding rate. The traditional audio bandwidth expansion extracts high-frequency parameters at the encoding end and transmits them to the decoding end. The decoding end copies the decoded low-frequency signal to the high-frequenc...

Claims

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Application Information

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IPC IPC(8): G10L19/032G10L19/038
Inventor 胡瑞敏姜林胡霞王晓晨张茂胜涂卫平李登实
Owner WUHAN UNIV
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