Bone Conduction Audio Signal Frequency Domain Extension
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Solution Overview
Problem
Existing bone conduction devices suffer from serious high frequency attenuation of audio signals, resulting in incomplete audio signal collection due to hardware defects in the bone conduction vibration pickup device.
Innovation Solution
An audio signal processing method that acquires a bone conduction audio signal, determines matching low frequency and high frequency transfer functions, and performs frequency domain extension to complete the audio signal, ensuring integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bone conduction vibration pickup device is used for audio signal collection, then sound transmission clarity in noisy environments is improved, but high frequency attenuation occurs resulting in incomplete audio signal
Solution Approach 1:
The patent introduces air conduction audio signal as an intermediary to bridge the high frequency gap. The air conduction pickup (microphone) captures high frequency components that the bone conduction pickup misses, and these are then integrated with the bone conduction signal through transfer function processing to reconstruct the complete audio spectrum.
Solution Approach 2:
The patent changes the frequency domain parameters of the bone conduction audio signal by applying transfer functions. The low frequency transfer function and high frequency transfer function modify the spectral characteristics of the bone conduction signal, extending it into the high frequency range where the original signal was attenuated.
2Device complexity
If bone conduction vibration pickup device is used, then sound wave transmission steps are reduced, but hardware defects cause high frequency attenuation
Solution Approach 1:
The patent merges two different audio pickup paths: bone conduction pickup and air conduction pickup (microphone). Each pickup method has complementary strengths - bone conduction provides clear low frequency transmission with fewer steps, while air conduction captures high frequency components. The transfer function processing combines these two signals to produce a complete audio signal with both low and high frequency integrity.
3Loss of information
If frequency domain extension is performed using transfer functions, then audio signal integrity is improved, but processing complexity increases
Solution Approach 1:
The patent segments the frequency extension process into two distinct parts: low frequency transfer function processing and high frequency transfer function processing. This segmentation allows each transfer function to be optimized for its specific frequency range, making the overall processing more manageable and effective than a single comprehensive transfer function would be.
Data Source
AI summary
An audio signal processing method including the following steps: acquiring a bone conduction audio signal collected by a bone conduction vibration pickup device; acquiring a low frequency transfer function which matches the bone conduction audio signal and a high frequency transfer function corresponding to the low frequency transfer function, wherein the low frequency transfer function and the high frequency transfer function are corresponding transfer functions between the bone conduction audio signal and an air conduction audio signal which correspond to the same voice; and performing frequency domain extension on the bone conduction audio signal on the basis of the low frequency transfer function and the high frequency transfer function, and taking the extended initial audio as output audio. The effect of improving the integrity pf a voice signal collected by a terminal device is achieved.