Piezoelectric Plate Voice Coil Hybrid Driver for Wideband Audio
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Solution Overview
Problem
Existing moving coil electrical-acoustic transformation devices face limitations in achieving high frequency cutoff frequencies above 10 kHz, particularly with the rise of 4G communications requiring super wideband capabilities up to 16 kHz and beyond.
Innovation Solution
Incorporating a vibration system with a magnetic circuit and a piezoelectric plate, along with first and second frequency division circuits acting as low pass and high pass filters respectively, to drive both the voice coil and piezoelectric plate, enabling the device to handle high and low frequency signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a moving coil electrical-acoustic transformation device is used, then the device structure is simple and easy to manufacture, but the high frequency cutoff frequency is limited to below 10 kHz
Solution Approach 1:
The patent combines a moving coil driver and a piezoelectric plate driver into a single electrical-acoustic transformation device. The moving coil driver handles lower frequency ranges while the piezoelectric plate handles higher frequency ranges, merging two different driving mechanisms to overcome the high frequency limitation of conventional moving coil devices while maintaining a integrated device structure
Solution Approach 2:
The patent segments the frequency response range by using a first frequency division circuit to direct lower frequency signals to the moving coil driver and a second frequency division circuit to direct higher frequency signals to the piezoelectric plate driver. This segmentation allows each driver to operate optimally within its designated frequency range, achieving super wideband response exceeding 16 kHz
2Manufacturing precision
If the high frequency cutoff frequency is increased to 16 kHz and higher for 4G communications, then the device meets super wideband requirements, but conventional moving coil structures cannot achieve this
Solution Approach 1:
The patent merges the moving coil driver structure with the piezoelectric plate driver structure, where the piezoelectric plate is positioned above the moving coil driver's diaphragm. This combination allows the device to achieve super wideband frequency response (above 16 kHz) required for 4G communications while maintaining reliable signal transmission through coordinated operation of both drivers
Solution Approach 2:
The patent implements dynamic signal routing through first and second frequency division circuits that dynamically direct different frequency components of the audio signal to appropriate drivers. The first frequency division circuit directs lower frequency signals to the moving coil driver, while the second frequency division circuit directs higher frequency signals to the piezoelectric plate, ensuring optimal performance across the entire frequency spectrum
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 configuration enhances the high frequency cutoff frequency to 16 kHz and higher, combining moving coil and piezoelectric sound generating structures for improved performance and wideband capabilities.
Implementation Method 1
a voice coil provided below the vibrating diaphragm and suspending in the magnetic gap
Implementation Method 2
a piezoelectric plate provided on one side of the vibrating diaphragm
Data Source
AI summary
Disclosed is an electrical-acoustic transformation device, including: a vibration system and a magnetic circuit system with a magnetic gap; wherein the vibration system includes: a diaphragm, a voice coil provided below the diaphragm and suspending in the magnetic gap, a piezoelectric plate provided on one side of the diaphragm, a first frequency division circuit connected to the voice coil, and a second frequency division circuit connected to the piezoelectric plate; and the first frequency division circuit performs frequency division on an externally input first audio signal and outputs same to the voice coil; and the second frequency division circuit performs frequency division on an externally input second audio signal to obtain a high frequency signal to drive the piezoelectric plate. The present invention provides an electrical-acoustic transformation device with super wideband.