MEMS Loudspeaker Curvature-Optimized Control Signals
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Solution Overview
Problem
Conventional microelectromechanical loudspeakers are inefficient in digitally reconstructing acoustic waves, resulting in poor sound pressure due to the limitations of their control signal configurations.
Innovation Solution
A microelectromechanical loudspeaker design featuring a plurality of elementary loudspeakers with drive units and diaphragms, controlled by a controller that supplies specific control signals with local and global extrema, optimizing the curvature and timing of the control signals to enhance sound pressure generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional control signals are used to drive elementary loudspeakers, then the device complexity is low, but the sound pressure is poor due to mutual extinction of sound pulses
Solution Approach 1:
The patent applies parameter changes by optimizing the control signal waveform parameters, specifically shaping the signal to have a global maximum curvature extremum preceding local extrema. This parameter optimization enhances the acoustic pressure generation by reducing mutual extinction effects between adjacent elementary loudspeakers, thereby improving sound pressure without adding device complexity
Solution Approach 2:
The patent utilizes periodic action through precisely timed control signals that are supplied to drive units in a coordinated sequence. The control signals are periodic in nature with specific timing relationships between global and local extrema, enabling constructive interference of sound pulses from multiple elementary loudspeakers to achieve higher net acoustic pressure
2Stress or pressure
If control signals with optimized curvature extrema are supplied to drive units, then the sound pressure generation is improved, but the control system complexity increases
Solution Approach 1:
The controller implements parameter changes by generating control signals with specifically optimized curvature characteristics. The signals are designed to have a global maximum curvature extremum positioned before local extrema, which optimizes the acoustic pressure generation. This is achieved through signal processing algorithms in the controller that shape the waveform parameters without requiring additional hardware components
Solution Approach 2:
The controller performs preliminary action by pre-calculating and shaping the control signal waveforms before they are supplied to the drive units. The curvature optimization is performed in advance, ensuring that the global maximum curvature extremum is positioned correctly relative to local extrema. This preliminary signal conditioning enables improved acoustic pressure generation without requiring real-time complex processing during operation
3Adaptability or versatility
If multiple elementary loudspeakers are used for digital sound reconstruction, then the frequency response is improved, but the mutual extinction effect reduces the net sound pressure
Solution Approach 1:
The patent applies local quality by supplying different optimized control signals to different drive units based on their spatial positions and functions. Each elementary loudspeaker receives a control signal with curvature extrema optimized for its specific location, which reduces mutual extinction effects and enhances the net acoustic pressure while maintaining broad frequency response capability across the array
Solution Approach 2:
The patent utilizes periodic action by coordinating the timing of control signals across multiple elementary loudspeakers. The control signals are supplied in a periodic sequence with precise timing relationships, ensuring that sound pulses from adjacent loudspeakers constructively interfere rather than extinguish each other. This periodic coordination enables both broad frequency response and high net acoustic pressure
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 optimized control signal configuration significantly improves sound pressure generation by reducing mutual extinction of sound pulses and increasing the net acoustic pressure, leading to more efficient digital sound reconstruction.
Implementation Method 1
a plurality of elementary loudspeakers 102-1, 102-2, . . . , 102-M each comprising a drive unit 106-1, 106-2, . . . , 106-M and a diaphragm 108-1, 108-2, . . . , 108-M deflectable by the drive unit
Data Source
AI summary
A microelectromechanical loudspeaker may include: a plurality of elementary loudspeakers each including a drive unit and a diaphragm deflectable by the drive unit, and a controller configured to respectively supply control signals to the drive units. The drive units may be respectively configured to deflect the corresponding diaphragms according to the respective control signals supplied by the controller to generate acoustic waves. The control signal supplied to at least one control unit may have at least one local extremum and a global extremum of a curvature of the control signal with a highest absolute value of the curvature may be located at a position of the control signal preceding a position of the at least one local extremum of the control signal.