Piezoelectric Actuator and Speaker Audio System for Low-Frequency Sound
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Solution Overview
Problem
Piezoelectric speakers face difficulties in producing low-frequency sounds due to structural or performance-related issues, often failing to match the amplitude of conventional speakers, limiting their ability to provide sounds across all frequency bands.
Innovation Solution
An electronic device incorporating a piezoelectric actuator and a speaker, where the audio processing circuit separates the audio signal into high-frequency and low-frequency bands using filters, with the piezoelectric actuator handling high-frequency vibrations and the speaker handling low-frequency sounds, allowing for comprehensive sound production across all frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a piezoelectric speaker is used to provide sound, then the device size can be reduced and shape flexibility improved, but the ability to provide low-frequency sounds with large amplitude is compromised
Solution Approach 1:
The audio output function is segmented into two separate components: a piezoelectric actuator for high-frequency sounds and a conventional speaker for low-frequency sounds. This segmentation allows each component to specialize in its optimal frequency range, resolving the contradiction by enabling compact design while maintaining low-frequency sound capability through the dedicated speaker component.
Solution Approach 2:
The electronic device incorporates multiple sound production mechanisms (piezoelectric actuator and conventional speaker) within a single device, making it universally capable of producing both high-frequency and low-frequency sounds. This multi-functionality approach allows the device to overcome the limitations of using either component alone.
2Reliability
If a conventional speaker is used to provide sound, then low-frequency sounds can be produced effectively, but the device occupies large space and requires fixed shape
Solution Approach 1:
The audio system is divided into two separate sound production components: a compact piezoelectric actuator for high-frequency sounds and a conventional speaker for low-frequency sounds. This segmentation allows the device to maintain small overall size while including only the necessary speaker components for low-frequency output, rather than requiring a large conventional speaker for all frequencies.
Solution Approach 2:
Different parts of the audio system are assigned different functions based on their optimal performance characteristics: the piezoelectric actuator handles high-frequency sounds where it excels, while the conventional speaker handles low-frequency sounds where it maintains superiority. This local quality assignment optimizes overall performance while minimizing device size.
3Speed
If a piezoelectric actuator is used to provide vibration to the first plate, then high-frequency sounds can be generated, but low-frequency sounds with large amplitude cannot be provided
Solution Approach 1:
The frequency spectrum is segmented into two ranges: high-frequency sounds (handled by the piezoelectric actuator vibrating the first plate) and low-frequency sounds (handled by the conventional speaker). This segmentation resolves the contradiction by assigning each frequency range to the component best suited for it, allowing high-speed vibration for high frequencies while maintaining amplitude capability for low frequencies through the speaker.
Solution Approach 2:
Instead of requiring the piezoelectric actuator to cover the entire frequency spectrum, the system applies partial action by having it handle only the high-frequency portion of the audio spectrum. The low-frequency portion is handled by the conventional speaker, allowing each component to operate within its optimal performance range without excessive demands.
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 efficiently provides both high-frequency and low-frequency sounds, ensuring effective sound reproduction in all frequency bands by leveraging the strengths of both piezoelectric actuators and speakers.
Implementation Method 1
piezoelectric actuator arranged inside the space so as to provide vibration to the first plate
Implementation Method 2
speaker arranged inside the space in a position adjacent to a periphery of the first plate
Data Source
AI summary
An electronic device according to various embodiments of the present invention can comprise: a housing including a first plate, a second plate, and a side member surrounding the space between the first plate and the second plate; a processor arranged in the space; a display exposed through a part of the first plate; a communication circuit arranged in the space; a piezoelectric actuator arranged in the space and providing vibration to the first plate; a speaker arranged in the space near the edge of the first plate; an audio processing circuit arranged in the space and electrically connected to the piezoelectric actuator and the speaker; and a memory arranged in the space and electrically connected to the processor. According to various embodiments, when instructions, which can be included by the memory, are executed, the processor wirelessly connects to an external device by using the communication circuit, receives an audio signal through the communication circuit, and provides the audio signal to the audio processing circuit. According to various embodiments, the side member can be separated from or integrated with the second plate. According to various embodiments, the audio processing circuit can provide, to the piezoelectric actuator, a first signal having a first frequency band and can provide, to the speaker, a second frequency band lower than the first frequency band, on the basis of at least a part of the audio signal. Additional various embodiments are possible.