Air-Pulse Sound Module Frequency Calibration for Uniform SPL
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Solution Overview
Problem
Manufacturing variations in air-pulse generating (APG) devices result in inconsistent acoustic performances, even when driving signals with the same amplitude are applied.
Innovation Solution
A calibration method that adjusts the operating frequency of APG devices to ensure consistent sound pressure levels by calibrating the devices to produce sound within a specific range, using a calibration system to adjust parameters such as operating frequency, demodulation amplitude, and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manufacturing process is used to produce APG devices, then devices can be fabricated, but manufacturing variations cause inconsistent acoustic performance
Solution Approach 1:
The patent changes the operating frequency parameter of APG devices to compensate for manufacturing variations. Each device is assigned a specific operating frequency that adjusts its acoustic output to fall within the target range, thereby achieving consistent acoustic performance across devices with different manufacturing tolerances
Solution Approach 2:
The patent performs preliminary calibration during the manufacturing process by measuring the acoustic performance of each APG device and determining its optimal operating frequency before the device is deployed. This preliminary action ensures that consistency is achieved without requiring complex post-manufacturing adjustments
2Manufacturing precision
If operating frequency is adjusted for each device, then acoustic performance consistency is improved, but calibration process complexity increases
Solution Approach 1:
The patent enables each APG device to self-calibrate by automatically determining its own optimal operating frequency based on its measured acoustic performance. The device stores this calibrated frequency and uses it autonomously, eliminating the need for complex external calibration equipment or manual adjustment processes
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
Ensures that multiple APG devices produce consistent sound pressure levels, achieving uniform acoustic performance across devices.
Implementation Method 1
an air-pulse generating device, configured to produce sound via generating a plurality of air pulses at a pulse rate corresponding to the operating frequency
Data Source
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AI summary
A calibration method comprises adjusting an operating frequency of an air-pulse generating device, such that a sound pressure level (SPL) of the air-pulse generating device is within a specific range. The sound producing module comprises the air-pulse generating device configured to produce sound via generating a plurality of air pulses at a pulse rate corresponding to the operating frequency.