Adjustable Rear Cavity Volume for Sound Unit Frequency Response Calibration
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Solution Overview
Problem
Dual sound-producing units in far-field silencing solutions often have inconsistent factory frequency responses, affecting the silencing effect due to differences in resonance peaks and sensitivities, which impacts the overall sound quality and user experience in virtual and augmented reality applications.
Innovation Solution
A sound-producing apparatus with two units, each featuring a cavity divided into a front and rear chamber, where an adjusting plate and driving mechanism allow for adjustable effective volume of the rear chamber, enabling the adjustment of frequency response consistency between units through calibration of the adjusting apparatus and input voltage control based on differential frequency response parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual sound-producing units are used in far-field silencing solutions, then the silencing capability is improved, but the consistency of frequency response between units deteriorates
Solution Approach 1:
The patent introduces an adjustable adjusting plate in the rear cavity that can be rotated to different positions, dynamically changing the effective volume of the rear cavity. This dynamic adjustment mechanism allows the frequency response to be tuned after manufacturing, compensating for inherent unit differences and achieving consistent frequency response between dual sound-producing units while maintaining far-field silencing performance
Solution Approach 2:
The patent changes the physical parameter of the rear cavity effective volume by rotating the adjusting plate to different angular positions. This parameter change (volume adjustment) directly affects the frequency response characteristics, enabling precise control over the frequency response consistency between units without compromising the silencing effect
2Manufacturing precision
If the effective volume of the rear cavity is adjusted, then the frequency response consistency is improved, but the device complexity increases
Solution Approach 1:
The adjusting apparatus is segmented into simple, discrete components: an adjusting plate with rotation capability and a driving portion with limited movement range. This segmentation allows the complex function of frequency response adjustment to be achieved through simple mechanical elements, minimizing the overall device complexity while maintaining adjustment precision
Solution Approach 2:
The adjusting plate can be manually rotated by the user to different positions without requiring complex automated control systems. The mechanism serves itself through simple user interaction, reducing the need for additional actuators, sensors, and control electronics, thereby keeping the device complexity low while enabling precise frequency response tuning
Data Source
AI summary
Disclosed are a sound-producing apparatus, a calibration method for the sound-producing apparatus, and a sound-producing unit. The sound-producing apparatus includes two sound-producing units; each of the sound-producing units includes a cavity, a sound-producing unit body and an adjusting apparatus; the sound-producing unit body is provided in the cavity, and the cavity is separated into a front cavity and a rear cavity; the adjusting apparatus includes an adjusting plate and a driving portion; and one end of the adjusting plate is rotatably provided on an inner wall of the rear cavity, and the driving portion is configured to drive the adjusting plate to move so as to adjust an effective volume of the rear cavity.