Acoustic Output with Bone-Air Routing for Power and Leakage
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Solution Overview
Problem
Existing acoustic output devices face challenges in balancing power consumption, volume, and sound leakage, where increasing volume leads to higher power consumption and poorer sound leakage performance.
Innovation Solution
The device employs a bone conduction vibrator and an air conduction vibrator, with a processing module dividing audio signals into frequency bands above and below a specific point (e.g., 600 Hz) to optimize sound output, using air conduction for lower frequencies to reduce power consumption and bone conduction for higher frequencies to enhance sound quality and minimize leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the volume output is increased, then the sound quality is improved, but the power consumption increases and sound leakage performance deteriorates
Solution Approach 1:
The audio signal is segmented into different frequency bands and routed to different vibration types: bone conduction vibrator handles low frequencies (below 600 Hz) while air conduction vibrator handles high frequencies (above 600 Hz). This segmentation allows each vibrator to operate efficiently in its optimal frequency range, reducing overall power consumption while maintaining sound quality.
Solution Approach 2:
Different vibration types are applied to different frequency components locally within the audio signal. The bone conduction vibrator is activated specifically for low-frequency components where it provides efficient energy transfer, while the air conduction vibrator is activated for high-frequency components. This localized application of different vibration mechanisms optimizes power consumption for each frequency band.
2Illumination intensity
If the volume output is increased, then the sound quality is improved, but the sound leakage performance deteriorates
Solution Approach 1:
The audio signal is segmented by frequency with a division point at 600 Hz. The bone conduction vibrator processes frequencies below 600 Hz while the air conduction vibrator processes frequencies above 600 Hz. This segmentation allows the system to maintain high volume output through bone conduction for low frequencies (which have better leakage characteristics) while using air conduction for high frequencies, thereby reducing overall sound leakage.
Solution Approach 2:
Different sound transmission methods are applied locally to different frequency bands. Bone conduction is used for low-frequency components where it provides better sound leakage performance, while air conduction is used for high-frequency components. This localized differentiation optimizes the sound leakage performance for each frequency range while maintaining overall sound quality.
3Device complexity
If air conduction is used for all frequencies, then the device structure is simplified, but the power consumption increases
Solution Approach 1:
The audio signal is segmented into low-frequency (below 600 Hz) and high-frequency (above 600 Hz) components. The bone conduction vibrator is activated for low-frequency components where it provides more efficient energy transfer, while the air conduction vibrator handles high-frequency components. This segmentation reduces overall power consumption by using the more efficient bone conduction path for low frequencies where it is most effective.
Solution Approach 2:
The system changes the operating parameters by selecting different vibration types based on frequency. For frequencies below 600 Hz, bone conduction vibration is used, while for frequencies above 600 Hz, air conduction vibration is used. This parameter change optimizes power consumption by matching the vibration type to the frequency band where it is most efficient.
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 approach reduces power consumption while maintaining high volume output and minimizing sound leakage, ensuring better sound quality and user privacy.
Implementation Method 1
a bone conduction vibrator configured to generate bone conduction sound waves and transmit the bone conduction sound waves to a cochlea through the housing to produce sound
Implementation Method 2
an air conduction vibrator configured to generate air conduction sound waves, the air conduction sound waves being transmitted to an ear through sound guiding holes in the housing
Data Source
AI summary
An acoustic output device is provided. The acoustic output device includes a housing; a bone conduction vibrator configured to generate bone conduction sound waves and transmit the bone conduction sound waves to a cochlea through the housing to produce sound; an air conduction vibrator configured to generate air conduction sound waves, the air conduction sound waves being transmitted to an ear through sound guiding holes in the housing; and a processing module configured to provide the bone conduction vibrator and the air conduction vibrator with a first audio signal and a second audio signal, respectively, the first audio signal and the second audio signal having a frequency division point, the first audio signal and the second audio signal including components with frequencies above and below the frequency division point, respectively. The frequency division point is not less than 600 Hz.