Adaptive Sound Receiving Apparatus with Dynamic Crossover Frequency Control
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Solution Overview
Problem
Bone conduction microphones suffer from serious attenuation in high frequencies and noise interference in low frequencies, resulting in suboptimal voice signal quality when used alone for communication.
Innovation Solution
A sound receiving apparatus and method that combines air conduction and bone conduction sound signals using an adaptive filter, crossover frequency control, and synthesis circuit to dynamically adjust the crossover frequency, separating frequency domains and enhancing sound quality by filtering and synthesizing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If only bone conduction microphone is used, then environment noise interference is reduced, but high frequency attenuation and low frequency noise occur
Solution Approach 1:
The patent combines air conduction and bone conduction sound receiving circuits into a unified system. The air conduction circuit captures high frequency components while the bone conduction circuit captures low frequency components, and both signals are merged through a synthesis circuit to produce a complete voice signal that overcomes the limitations of either circuit alone.
Solution Approach 2:
The patent divides the frequency spectrum into different segments handled by different sound receiving circuits. The air conduction circuit primarily handles high frequency components, while the bone conduction circuit handles low frequency components. This segmentation allows each circuit to operate in its optimal frequency range, avoiding the weaknesses of individual approaches.
2Reliability
If air conduction sound receiving is used, then high frequency response is improved, but environment noise interference increases
Solution Approach 1:
The patent merges air conduction and bone conduction signals to combine the high frequency advantages of air conduction with the noise rejection advantages of bone conduction. The synthesis circuit intelligently combines both signal sources to produce a balanced output.
Solution Approach 2:
The patent applies different processing characteristics to different frequency ranges. The air conduction signal is primarily used for high frequency components where it excels, while the bone conduction signal is used for low frequency components where it performs better, creating a frequency-dependent signal routing strategy.
3Device complexity
If fixed frequency separation is used, then signal processing is simplified, but adaptive sound quality optimization is reduced
Solution Approach 1:
The patent implements dynamic crossover frequency control that automatically adjusts the frequency separation point based on the actual sound signal characteristics. The system continuously analyzes the input signal and adapts the crossover frequency to optimize performance for different speech conditions, environments, and users, transforming a static system into an adaptive one.
Solution Approach 2:
The patent employs feedback mechanisms where the system monitors the output signals from both air and bone conduction circuits and uses this information to adjust the crossover frequency and signal mixing ratios. This closed-loop control enables the system to self-optimize based on real-time performance metrics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves sound quality by effectively combining high-frequency air conduction and low-frequency bone conduction signals, reducing noise and attenuation, and providing a better adaptive sound receiving result.
Implementation Method 1
The adaptive filter is configured to perform calculation according to a minimum of an error function in real time to generate a transferring filter function to filter the bone conduction sound signal
Implementation Method 2
a bone conduction microphone can be equipped in the earphone to receive the signal transmitted through the vibration of bones and skins when the user is speaking
Implementation Method 3
The air conduction sound receiving circuit is configured to generate an air conduction sound signal according to a sound
Data Source
AI summary
The present disclosure discloses a sound receiving that includes an air conduction sound receiving circuit, a bone conduction sound receiving circuit, an adaptive filter, a crossover frequency control circuit and a synthesis circuit. The air conduction sound receiving circuit generates an air conduction sound signal. The bone conduction sound receiving circuit generates a bone conduction sound signal. The adaptive filter performs calculation according to a minimum of an error function in real time to generate a transferring filter function to filter the bone conduction sound signal to generate a transferred bone conduction sound signal. The crossover frequency control circuit determines a crossover frequency according to a maximum energy frequency point of the transferring filter function on a frequency domain. The synthesis circuit synthesizes the air conduction sound signal higher than the crossover frequency and the bone conduction sound signal lower than the crossover frequency to generate a synthesized sound signal.