Band spreading method and device, electronic equipment and computer readable storage medium

Abstract

The embodiment of the invention discloses a band spreading method and device, electronic equipment and a computer readable storage medium. The method comprises the steps of performing time-frequency transformation on a narrow-band signal to be processed to acquire a corresponding initial low frequency spectrum; based on the initial low frequency spectrum, acquiring correlation parameters of a highfrequency part and a low frequency part of a target wideband spectrum via a neural network model, wherein the correlation parameters comprise at least one of a high frequency spectrum envelop and relative flatness information, and the relative flatness information represents correlation between the spectrum flatness of the high frequency part and the spectrum flatness of the low frequency part ofthe target wideband spectrum; based on the correlation parameters and the initial low frequency spectrum, acquiring an initial high frequency spectrum; and acquiring a broadband signal after band spreading according to a target low frequency spectrum and a target high frequency spectrum, wherein the target low frequency spectrum is the initial low frequency spectrum or the spectrum acquired afterfiltering treatment is performed on the initial low frequency spectrum, and the target high frequency spectrum is the initial high frequency spectrum or the spectrum acquired after filtering treatment is performed on the initial high frequency spectrum.

Description

technical field [0001] The embodiments of the present application relate to the technical field of audio processing, and in particular, the present application relates to a frequency band extension method, device, electronic equipment, and computer-readable storage medium. Background technique [0002] Band extension, also known as band duplication, is a classic technique in the field of audio coding. Band extension technology is a parametric coding technology, through which the effective bandwidth can be expanded at the receiving end to improve the quality of the audio signal, so that users can intuitively experience brighter timbre, greater volume and better reliability. understanding. [0003] In the prior art, a classic implementation method of frequency band expansion is to use the correlation between high frequency and low frequency in the speech signal to perform frequency band expansion. In the audio coding system, the above correlation is used as side information. ...

AI Technical Summary

Problems solved by technology

This coefficient-coefficient mapping method has high requirements on the generalization ability of the network; in order to ensure the effect, the depth and volume of the network are large and the complexity is high; , the performance of this method is generally

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