Headphone Helmholtz Resonator Adaptive Frequency Control
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Solution Overview
Problem
Existing headphones face a challenge in balancing noise canceling performance and sound quality, as adapting acoustic characteristics for improved noise canceling often results in frequency balance issues when noise canceling is turned off.
Innovation Solution
The headphone incorporates an electro-acoustic transducer, a noise canceling circuit, a resonant frequency converter for the Helmholtz resonator, and a switch that alter the resonant frequency and noise canceling circuit together, allowing for adaptive acoustic characteristics based on whether noise canceling is on or off, thereby balancing noise canceling performance and sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acoustic characteristics are adapted to improve noise canceling performance, then the noise canceling performance is improved, but the frequency balance is lost when noise canceling is turned off
Solution Approach 1:
The patent implements dynamic adjustment of the Helmholtz resonator's resonant frequency using a variable capacitor that changes capacitance based on the noise canceling mode. When noise canceling is activated, the resonant frequency shifts to enhance low-frequency attenuation; when deactivated, it returns to maintain natural frequency balance, thus resolving the contradiction between noise canceling performance and frequency balance
Solution Approach 2:
The patent changes the electrical parameter (capacitance) of the Helmholtz resonator system dynamically. By adjusting the capacitance value according to the noise canceling state, the resonant frequency parameter is modified to achieve optimal noise canceling performance when needed, while maintaining proper frequency characteristics when noise canceling is off
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
This solution enables high-performance noise canceling and high sound quality by adjusting acoustic characteristics dynamically, ensuring optimal frequency balance regardless of the noise canceling mode.
Implementation Method 1
a resonant frequency converter adapted to change a resonant frequency of a Helmholtz resonator configured to include a cavity in the housing and a tubular cavity communicating with the cavity
Implementation Method 2
a noise canceling circuit configured to attenuate a noise sound by adding an antiphase sound to the noise sound
Data Source
AI summary
A headphone includes an electro-acoustic transducer, a housing, a noise cancelling circuit, a resonant frequency converter, and a switch. The electro-acoustic transducer is configured to reproduce sound from electrical signals. The housing is attached to the electro-acoustic transducer. The noise cancelling circuit is configured to attenuate a noise sound by adding an antiphase sound to the noise sound. The resonant frequency converter is configured to change a resonant frequency of a Helmholtz resonator configured to include a cavity in the housing and a tubular cavity communicating with the cavity. The switch is configured to perform alteration of the resonant frequency and switching of the noise cancelling circuit, in conjunction with each other.