Air-Pulse Sound Module Frequency Tuning for Uniform SPL
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Solution Overview
Problem
Manufacturing variations in air-pulse generating (APG) devices lead to inconsistent acoustic performances, even when driving signals with the same amplitude are applied, necessitating a calibration method to achieve consistent sound pressure levels.
Innovation Solution
A calibration method adjusts the operating frequency of APG devices to ensure sound pressure levels fall within a specific range, using a calibration system to measure and adjust parameters for consistent acoustic performance across multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manufacturing process is used to produce APG devices, then production efficiency is improved, but manufacturing variations cause inconsistent acoustic performance
Solution Approach 1:
The patent adjusts operating parameters (driving frequency, pulse width, duty cycle) of APG devices during calibration to compensate for manufacturing variations. By changing these parameters, the sound pressure level of each device is tuned to fall within a target range, thereby achieving consistent acoustic performance across devices produced through standard manufacturing processes.
2Manufacturing precision
If calibration process is added to adjust operating parameters, then acoustic performance consistency is improved, but process complexity increases
Solution Approach 1:
The calibration system automatically measures the sound pressure level of each APG device and adjusts its operating parameters without requiring manual intervention. The system self-calibrates by iterating through parameter adjustments until the device meets the target acoustic performance criteria, thereby reducing process complexity despite adding calibration steps.
Solution Approach 2:
The calibration process incorporates feedback loops where the measured sound pressure level of each device is used to determine subsequent parameter adjustments. The system continuously monitors acoustic output and modifies operating parameters based on this feedback, enabling automatic compensation for manufacturing variations through a systematic rather than ad-hoc approach.
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 method ensures that APG devices produce consistent sound pressure levels by calibrating operating frequencies, resulting in uniform acoustic performance across a range of devices.
Implementation Method 1
an air-pulse generating device, configured to produce sound via generating a plurality of air pules at a pulse rate corresponding to the operating frequency
Data Source
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.