Dual-Conduction Acoustic Output Device for Mid-Low Audio
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Solution Overview
Problem
Wearable acoustic output devices, particularly bone conduction speakers, suffer from poor performance in the mid-low frequency range and strong vibrations, affecting user comfort.
Innovation Solution
An acoustic output device incorporating both bone conduction and air conduction speakers, with independent operation and specific spatial arrangements, to enhance audio experience at mid-low frequencies and reduce sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bone conduction speaker is used to provide audio signals, then audio output is achieved, but mid-low frequency performance deteriorates and strong vibrations occur affecting user comfort
Solution Approach 1:
The patent combines bone conduction speaker and air conduction speaker into a single wearable device. The bone conduction speaker handles high-frequency sounds while the air conduction speaker handles mid-low frequency sounds, merging two different sound transmission pathways to achieve complete frequency coverage and eliminate the mid-low frequency deficiency of bone conduction alone.
Solution Approach 2:
The patent segments the audio frequency spectrum into two parts: high frequencies handled by bone conduction and mid-low frequencies handled by air conduction. This segmentation allows each speaker type to operate in its optimal frequency range, preventing the bone conduction speaker from attempting to reproduce frequencies it cannot effectively generate.
2Reliability
If bone conduction speaker generates strong vibrations to produce sound, then audio output is achieved, but user comfort deteriorates
Solution Approach 1:
The patent converts the harmful strong vibrations of bone conduction speakers into a benefit by using air conduction speaker to generate mid-low frequency sounds through air pressure changes instead of mechanical vibrations. This eliminates the uncomfortable vibrations while maintaining sound generation capability in the mid-low frequency range.
3Reliability
If air conduction speaker is added to enhance mid-low frequency performance, then audio quality improves, but device complexity increases
Solution Approach 1:
The patent designs the wearable device with dual speakers that serve different frequency ranges, making each component specialized for its function. The bone conduction speaker handles high frequencies and the air conduction speaker handles mid-low frequencies, creating a multi-functional audio system that covers the complete frequency spectrum from a single integrated device.
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 device provides improved audio quality in the mid-low frequency range while minimizing vibrations and sound leakage, enhancing user comfort and experience.
Implementation Method 1
a bone conduction speaker configured to generate bone conduction acoustic waves
Implementation Method 2
an air conduction speaker configured to generate air conduction acoustic waves
Implementation Method 3
a magnetic circuit system configured to generate a magnetic field; one or more coils connected to the vibrating plate, wherein the one or more coils vibrate in the magnetic field
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
The present disclosure provides an acoustic output device. The acoustic output device may comprise a bone conduction speaker configured to generate bone conduction acoustic waves. The acoustic output device may also comprise an air conduction speaker configured to generate air conduction acoustic waves, the air conduction speaker being independent of the bone conduction speaker. The acoustic output device may further comprise at least one housing configured to accommodate the bone conduction speaker and the air conduction speaker.