Transient steady-state signal separation-based hybrid virtual bass enhancement processing method

Abstract

The invention discloses a transient steady-state signal separation-based hybrid virtual bass enhancement processing method. The method comprises the following steps: 1, separating the transient component from the steady component in the original audio signal by using a transient/steady signal separation algorithm; carrying out virtual bass processing through a virtual bass generation module basedon a nonlinear device and a virtual bass generation module based on a phase vocoder; performing harmonic amplitude control on the obtained two paths of virtual bass signals to enable the two paths ofvirtual bass signals to meet an equal loudness curve, combining the two paths of virtual bass signals into one path, and finally superposing the obtained virtual bass signals and high-frequency signals obtained after performing high-pass filtering and delay processing on the obtained virtual bass signals and original audio signals to obtain audio signals after hybrid virtual bass enhancement processing. According to the method, steady-state distortion and transient distortion of virtual bass processing are greatly reduced, so that the bass effect is enhanced while the original quality of the audio signal after virtual bass processing is kept, and the resonance, fullness, vigorousness and space feeling of the audio are enhanced.

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to a method for enhancing processing of virtual bass based on transient state signal separation and mixing. Background technique [0002] In the current miniaturized and lightweight multimedia equipment, the speakers embedded in it have very strict restrictions on the size. This physical limitation makes the low-frequency reproduction ability of the small speakers poor, but the low-frequency components in the audio are harmful to the hearing. Sound perception plays a very important role, directly affecting the loudness, fullness, thickness and sense of space of the sound. How to improve the low-frequency performance of small speakers is an urgent problem in the field of audio design. [0003] Virtual bass enhancement technology is a more effective solution. The existing virtual bass enhancement algorithms are mainly based on nonlinear devices, phase vocoders, and hybrid v...

AI Technical Summary

Problems solved by technology

Among them, the method based on nonlinear devices has a faster processing speed, and the bass effect produced by transient signals is better, such as drums, etc., but it will produce nonlinear distortion for steady-state signals; the algorithm based on phase vocoder is through short The time-Fourier transform obtains the time-frequency information of the audio signal, and then generates harmonics by increasing the phase change rate of the low-frequency component of the signal. This method is more flexible and effectively controls signal distortion, but the processing speed is slow, and the phase vocoder In order to obtain a higher low-frequency resolution, there must be a large analysis window in the time domain, which will cause certain distortion to the transient signal, so the bass enhancement algorithm based on the phase vocoder has a better effect on the steady-state signal. Performance

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