Speaker Phase Plug Incompressible Air Cavity High Frequency Attenuation
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Solution Overview
Problem
Conventional speaker systems experience severe attenuation of high-frequency sound signals due to interference caused by path differences, leading to inefficient sound propagation.
Innovation Solution
A speaker apparatus with a speaker diaphragm, a horn, and a phase plug forming an incompressible air cavity, where the phase plug is positioned close to the diaphragm to adjust the sound signal's phase and amplitude, ensuring lossless propagation by matching impedance and increasing radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phase plug is disposed inside the horn to eliminate interference caused by path difference, then sound amplification effect is optimized and reproduction degree is improved, but severe attenuation is caused when high-frequency sound signal is output
Solution Approach 1:
The patent changes the physical parameters of the air cavity by positioning the phase plug at a specific distance (less than wavelength of sound signal, specifically 0.5mm to 1mm) from the speaker diaphragm. This parameter change transforms the air cavity into an incompressible state, which eliminates the path difference interference for high-frequency signals while maintaining the phase correction function, thereby resolving the contradiction between sound amplification and high-frequency attenuation
Solution Approach 2:
The patent introduces an incompressible air cavity as an intermediary medium between the speaker diaphragm and the phase plug. This intermediary structure allows sound waves to propagate without compression effects, eliminating interference patterns and severe attenuation while still enabling the phase plug to perform its function of adjusting phase and amplitude, thus optimizing both sound amplification and high-frequency output
2Productivity
If the distance between speaker diaphragm and phase plug is reduced to form an incompressible air cavity, then impedance matching is achieved and radiation efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a concrete parameter range for the distance between the phase plug and speaker diaphragm (0.5mm to 1mm, which is less than the wavelength of the sound signal). This parameter specification achieves the incompressible air cavity effect for impedance matching and improved radiation efficiency, while providing a clear manufacturing target that balances precision requirements with manufacturability
Solution Approach 2:
The patent employs brackets as self-aligning support structures that automatically maintain the correct distance and positioning between the phase plug and speaker diaphragm during assembly and operation. These brackets provide mechanical constraints that ensure the 0.5mm to 1mm spacing is maintained without requiring complex precision machining or adjustment mechanisms, thereby achieving both high radiation efficiency and ease of manufacture
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 enhances high-frequency sound output by up to 8 dB to 10 dB in the frequency range of 2 kHz to 20 kHz, improving radiation efficiency and sound amplification.
Implementation Method 1
relative locations of the speaker diaphragm and the phase plug remain unchanged to form an incompressible air cavity
Implementation Method 2
impedance Zms of the speaker apparatus matches radiation impedance Zmr of sound of the speaker apparatus in propagation space
Implementation Method 3
radiation efficiency of the speaker is improved, and output of the sound signal of the speaker apparatus at a high frequency is improved
Data Source
AI summary
This application provides a speaker apparatus includes: a speaker sound emission unit that includes a speaker diaphragm and configured to convert an electrical signal into a sound signal by using the speaker diaphragm; a horn includes a sound inlet and a sound outlet, the speaker sound emission unit is disposed on the sound inlet, and the horn is configured to amplify the sound signal and then propagate an amplified sound signal through the sound outlet; and a phase plug, configured to adjust a phase and/or an amplitude of the sound signal from the sound inlet; where relative locations of the speaker diaphragm and the phase plug remain unchanged to form an incompressible air cavity.