Sub-Band Audio Processing for Virtual Bass Distortion Control
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Solution Overview
Problem
Small loudspeakers struggle with effective playback of low-frequency components, leading to timbre distortion due to intermodulation distortion caused by non-linear device algorithms used for virtual bass enhancement.
Innovation Solution
Perform sub-band filtering on audio signals to generate sub-band signals, apply a non-linear device algorithm to each band-pass signal, and combine these with high-pass filtering to reduce intermodulation distortion, enhancing virtual bass while minimizing timbre distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a non-linear device algorithm is used for virtual bass enhancement on the audio signal, then the bass playback effect is improved, but intermodulation distortion is introduced causing perceived timbre distortion
Solution Approach 1:
The audio signal is divided into multiple frequency bands using filter banks, with each band processed separately through non-linear device algorithms. This segmentation isolates the harmful intermodulation distortion to specific frequency ranges while preserving the desired bass enhancement effect in other bands, thereby resolving the contradiction between improved bass playback and reduced timbre distortion.
2Volume of moving object
If the physical structure of the loudspeaker is reduced to make it smaller, then the convenience and miniaturization are improved, but the ability to playback low frequency components deteriorates
Solution Approach 1:
The patent replaces the mechanical approach of using a physically large loudspeaker for bass playback with a signal processing approach. By applying non-linear device algorithms to generate harmonic waves and virtual bass effects through digital signal processing, the system achieves effective low frequency reproduction without requiring a large physical loudspeaker structure, thus resolving the contradiction between miniaturization and bass playback capability.
Data Source
AI summary
An audio signal processing method, device and storage medium, are provided. The method includes performing sub-band filtering on a to-be-processed audio signal to obtain a plurality of sub-band signals, wherein the number of the sub-band signals is determined according to a lowest frequency of a band-pass filter and a cut-off frequency of an audio apparatus, and the sub-band signals comprise sub-band band-pass signals; and obtaining a target audio signal according to each of the sub-band band-pass signals and a processing algorithm of virtual bass enhancement signal.