Buzzer Control Signal Modulation for Volume Stability
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Solution Overview
Problem
Simple buzzers in household appliances suffer from volume fluctuations due to poor acoustic quality, narrow usable bandwidth, and frequency-dependent volume, making it difficult to distinguish between different acoustic signals.
Innovation Solution
A method using a pulse-frequency-variable, pulse-width-modulated buzzer control signal with multiple frequencies within the expected fluctuation range of the buzzer's maximum volume frequency, allowing for high volume generation and improved signal distinguishability through slight pitch changes and vibrato modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple buzzers are used with fixed frequency square-wave signals, then the device complexity is low and cost is low, but the volume is subject to strong fluctuations and the usable bandwidth is narrow
Solution Approach 1:
The patent applies dynamics by modulating the frequency of the square-wave signal dynamically. Instead of using a fixed frequency, the system varies the frequency within a range that accounts for manufacturing tolerances and environmental influences, ensuring that the buzzer operates at or near its maximum volume frequency regardless of individual component variations. This frequency modulation allows the system to adapt to different buzzer characteristics without changing the hardware circuitry.
Solution Approach 2:
The patent changes the frequency parameter of the drive signal to optimize buzzer performance. By sweeping or modulating the frequency around the expected maximum volume frequency, the system compensates for variations in buzzer characteristics. This parameter change approach allows a simple buzzer to achieve stable, high volume output without complex circuitry or individual adaptation.
2Ease of operation
If the volume is changed by varying voltage or switching series resistors, then the volume control is achieved, but the circuitry becomes very complex and stepless adjustment is often not possible
Solution Approach 1:
The patent replaces the mechanical/electrical approach of voltage variation or resistor switching with an electronic signal processing approach. Instead of physically changing circuit parameters to control volume, the system uses frequency modulation of the drive signal to achieve volume optimization. This substitution eliminates the need for complex voltage control circuitry or resistor switching mechanisms while providing effective volume control.
3Adaptability or versatility
If various buzzer control signals with different durations or sequences are used, then different acoustic signals can be generated, but the signals are often difficult to distinguish
Solution Approach 1:
The patent applies local quality by assigning distinct frequency characteristics to different acoustic signals. Instead of relying solely on duration or sequence variations, each signal type (e.g., confirmation, error, warning) is assigned a specific frequency or frequency pattern within the modulated range. This frequency differentiation enhances the local quality of each signal, making them more easily distinguishable while maintaining signal variety.
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 method enhances the clarity and perceptibility of acoustic signals, enabling users to better differentiate between signals even in noisy environments and achieving a high volume with minimal distortion, suitable for various buzzer types without individual adaptation.
Implementation Method 1
simple buzzers using piezo technology or magnetic technology
Implementation Method 2
simple buzzers using piezo technology or magnetic technology
Data Source
Figure 1~2
AI summary
The method serves to operate a buzzer (1) of a household appliance (H), wherein the buzzer (1) is controlled to generate an acoustic signal via a pulse-frequency-variable pulse-width modulated buzzer control signal (4). The buzzer control signal (4) has at least two pulse frequencies which lie within an expected fluctuation range of a maximum volume frequency of the buzzer (1).