Adaptive grid construction method and device for bandwidth extension coding
A bandwidth expansion and self-adaptive technology, applied in the field of bandwidth expansion encoding and decoding, can solve the problems of high resolution in the frequency domain, the signal cannot track the original audio signal changes well, and the harmonic signal cannot be accurately restored, so as to improve the encoding efficiency effect
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[0063] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0064] figure 2 A flowchart of an adaptive grid construction method 100 for bandwidth extension coding according to an embodiment of the present invention is shown. Such as figure 1 As shown, the method 100 includes the following steps:
[0065] Step S110 , based on the transient analysis of the input monophonic audio signal for frequency resolution selection, adaptive multi-resolution QMF filtering is performed on the input monophonic audio signal to obtain an optimal time-frequency filtered signal.
[0066] In this step, first analyze the transient properties of the input mono audio signal in...
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