Sound-Producing Device with Aperture Shutter for Low Distortion
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Solution Overview
Problem
Loudspeakers suffer from harmonic distortion and inter-modulation distortion, degrading sound quality, particularly in ultrasonic frequencies.
Innovation Solution
A sound producing device and method that generates an amplitude-modulated acoustic wave using a shutter element and amplitude-modulation means, with a control signal irrelevant to the input audio signal, to obscure an aperture and perform a compressed-and-expanded movement, avoiding nonlinear alteration of acoustic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional loudspeaker design is used to produce sound, then sound can be generated, but harmonic distortion and inter-modulation distortion occur degrading sound quality
Solution Approach 1:
The loudspeaker system is segmented into distinct functional components: a shutter element for aperture control and a blind element with aperture for acoustic wave generation. This segmentation allows independent optimization of each component to eliminate distortion while maintaining sound quality.
Solution Approach 2:
The shutter element performs dynamic compressed-and-expanded movements in response to control signals, enabling real-time modulation of the acoustic field without the nonlinearities present in conventional speaker cone vibrations. This dynamic control eliminates harmonic and inter-modulation distortion.
2Volume of moving object
If ultrasonic frequency operation is used, then compact design is achieved, but distortion increases degrading sound quality
Solution Approach 1:
The conventional mechanical speaker cone vibration system is replaced with an acoustic field modulation system using shutter and blind elements. This substitution enables ultrasonic operation with compact dimensions while eliminating the mechanical nonlinearities that cause distortion in traditional ultrasonic speakers.
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 achieves linear output with respect to the input audio signal, eliminating harmonic and inter-modulation distortion, thereby enhancing sound quality.
Implementation Method 1
an amplitude-modulated acoustic wave is produced according to an input audio signal
Implementation Method 2
a shutter element configured to obscure an aperture positioned to receive an amplitude-modulated acoustic wave
Data Source
AI summary
The sound producing device includes a shutter element configured to obscure an aperture positioned to receive an amplitude-modulated acoustic wave; a blind element, wherein the aperture is formed within the blind element; and an amplitude-modulation means, configured to generate an amplitude-modulated acoustic wave toward the aperture; wherein the amplitude-modulated acoustic wave is produced according to an input audio signal.