Multi-Sensor Microphone Equalization for Acoustic Resonance Control
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Solution Overview
Problem
Current single-membrane microphones in smartphones face challenges in achieving both high sensitivity and high volume sound recording, often resulting in distortion or noise due to acoustic resonance issues.
Innovation Solution
A sound recording apparatus with a housing, acoustical resonator, and multiple sensors that convert sound signals into electronic signals, using an equalizer to compensate for frequency response offsets and stabilize the output signal, combining signals from high sensitivity and high volume sensors to generate a high-quality output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-membrane microphone is designed for high sensitivity, then noise is reduced and recording quality is improved, but distortion occurs when used for high-volume sound recording
Solution Approach 1:
The patent divides the single microphone function into multiple specialized sensors: a first sensor optimized for high sensitivity (low volume) sound recording and a second sensor optimized for high volume sound recording. Each sensor segment handles specific sound level ranges, preventing distortion while maintaining sensitivity across different recording conditions.
Solution Approach 2:
The patent changes the operational parameters of different sensors based on sound volume levels. The system dynamically selects or combines signals from sensors with different sensitivity parameters depending on the input sound level, allowing optimal performance across both high sensitivity and high volume conditions without distortion.
2Power
If a single-membrane microphone is designed for high volume sound recording, then high-volume recording is achieved, but noise increases
Solution Approach 1:
The patent segments the sound recording function into multiple sensors with different characteristics. The first sensor captures high-volume sounds with low noise, while the second sensor handles other ranges. This segmentation allows the system to achieve high volume recording without the noise penalty that would result from using a single high-volume optimized microphone.
Solution Approach 2:
The patent uses multiple copies of sensing elements with different optimization characteristics. Instead of one microphone trying to do everything, multiple sensor copies specialize in different sound level ranges, and the system selects or combines their outputs to achieve clean high-volume recording.
3Adaptability or versatility
If multi-membrane microphones are used to satisfy both high sensitivity and high volume requirements, then both requirements are met, but acoustic resonance problems occur
Solution Approach 1:
The patent extracts the problematic acoustic resonance element (the resonator cavity) from the microphone structure. By eliminating the enclosed resonator space that causes unwanted resonance, the system maintains dual capability for high sensitivity and high volume recording without suffering from acoustic resonance distortion.
Solution Approach 2:
The patent addresses acoustic resonance by removing the resonator structure that creates harmful resonance effects. This design choice converts what would be a harmful resonance-prone structure into a benefit by using an open or alternative structure that eliminates resonance problems while maintaining the desired dual recording capabilities.
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
The solution enables high sensitivity and high volume sound recording with reduced noise and instability, effectively addressing acoustic resonance issues to produce a stable and high-quality output signal.
Implementation Method 1
The acoustical resonator causes the microphone to generate a frequency response offset
Implementation Method 2
The sensors are configured to convert the sound signal into a plurality of electronic signals
Data Source
AI summary
An apparatus and a method for sound recording are provided. The apparatus stores an equalizer and includes a housing, a microphone, and a processor. The microphone includes a plurality of sensors and receives a sound signal through an acoustical resonator in the housing. The microphone generates a plurality of electronic signals in response to the sound signal. The equalizer generates a plurality of equalized signals according to the electronic signals. The processor generates an output signal according to the equalized signals. The equalizer compensates the gain margin and the phase margin caused by the sound signal passing through the acoustical resonator in order to prevent the output signal from being affected by resonance of the sound signal in the acoustical resonator.