Open-Ear Audio Housing With Frequency Division for Speaker Protection
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Solution Overview
Problem
Existing acoustic devices experience sound breakage due to thin diaphragms in high-frequency speakers when receiving low-frequency signals, affecting listening quality and user experience.
Innovation Solution
A sound output device with a frequency-dividing circuit that attenuates low-frequency components of the excitation signal to prevent sound breakage in high-frequency speakers, using a housing positioned near the ear canal without blocking it, and incorporating separate speakers for different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electrical signal drives multiple speakers with different frequency bands, then the system structure is simple, but the thin diaphragm of high-frequency speakers experiences sound breakage when receiving low-frequency signals
Solution Approach 1:
The patent divides the audio frequency spectrum into multiple bands using frequency division circuits, assigning different frequency ranges to different speakers. High-frequency speakers receive only high-frequency signals while low-frequency speakers handle bass signals, preventing the thin diaphragm of high-frequency speakers from experiencing excessive amplitude that causes sound breakage.
Solution Approach 2:
The patent applies different frequency response characteristics to different speakers based on their specific capabilities. Each speaker is optimized for its designated frequency band, with high-frequency speakers having thin diaphragms suited for high frequencies and low-frequency speakers having larger diaphragms suited for bass, thereby matching local structural qualities to functional requirements.
2Reliability
If multiple frequency-dividing circuits are used to prevent sound breakage, then sound quality improves, but device complexity increases
Solution Approach 1:
The patent designs frequency division circuits that can be integrated into existing audio systems with minimal additional components. The same circuit architecture can serve multiple speakers across different frequency bands, and the circuits can be implemented using standard audio processing components, reducing overall system complexity while achieving frequency-specific optimization.
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
Prevents sound breakage in high-frequency speakers by attenuating low-frequency signals, ensuring better listening quality and user experience while allowing external sound transmission.
Implementation Method 1
a frequency-dividing circuit configured to perform a frequency division process on an excitation signal to generate the first electrical signal
Implementation Method 2
a first speaker configured to generate a sound in a first frequency band in response to receiving a first electrical signal
Implementation Method 3
a second speaker configured to output a sound of a second frequency band
Implementation Method 4
the first rear cavity is provided with a sound hole, one end of the sound hole is in communication with the first rear cavity, and the other end of the sound hole is in communication with the second front cavity
Data Source
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AI summary
A sound output device is provided. The sound output device includes: a first speaker configured to generate a sound in a first frequency band in response to receiving a first electrical signal; a frequency-dividing circuit configured to perform a frequency division process on an excitation signal to generate the first electrical signal, wherein the frequency-dividing circuit is configured to: suppress signal components of the excitation signal with frequencies lower than a frequency-dividing frequency, so that a signal component of the first electrical signal with a frequency lower than a sound breaking frequency of the first speaker is attenuated by a preset amplitude compared to a signal component of the excitation signal with a frequency lower than the sound breaking frequency; a housing configured to accommodate the first speaker and the frequency-dividing circuit; and a support structure configured to place the housing at a position near an ear canal opening of a user without blocking the ear canal opening of the user.