Buzzer Gain Control Using Boost Ratio to Prevent Distortion
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Solution Overview
Problem
Conventional buzzers are limited to producing a single tone and suffer from poor sound quality due to the filtering of sound details, and increasing input voltage through a voltage booster can cause signal distortion.
Innovation Solution
A buzzer driving system comprising a driving unit, boost unit, and gain estimation unit that adjusts the amplification gain based on detected boost ratio to enhance sound volume and quality, allowing the buzzer to reproduce sound details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a voltage booster is used to increase input voltage to raise buzzer volume, then the sound volume is improved, but signal distortion occurs
Solution Approach 1:
The patent applies preliminary action by detecting the boost ratio of the voltage booster before the audio signal passes through it. The gain estimation unit measures the voltage transformation ratio in advance, and the driving unit pre-adjusts the audio signal gain based on this detected ratio, preventing signal distortion before it occurs rather than correcting it afterward.
Solution Approach 2:
The patent implements feedback by using the gain estimation unit to continuously monitor the boost ratio of the voltage booster and feed this information back to the driving unit. The driving unit then adjusts the audio signal gain accordingly, creating a closed-loop control system that maintains optimal signal levels despite voltage variations.
2Device complexity
If digital signals are used to drive buzzers, then the device complexity is reduced, but sound quality deteriorates due to filtering of sound details
Solution Approach 1:
The patent applies dynamics by adjusting the gain factor dynamically based on the detected boost ratio. Instead of using a fixed gain setting, the system continuously adapts the audio signal amplification level according to the actual voltage transformation ratio, optimizing sound quality for varying operating conditions while maintaining simple digital driving circuits.
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 system preserves sound quality and increases volume while preventing signal distortion, enabling buzzers to produce detailed sound comparable to speakers, with advantages of high volume, low cost, and durability.
Implementation Method 1
The boost unit is electrically connected to the driving unit and boosts an input voltage to generate a working voltage for the driving unit
Implementation Method 2
The driving unit adjusts the gain of an audio signal through a gain control circuit with a gain factor
Implementation Method 3
The gain estimation unit sequentially compares the input voltage with each of the stepwise voltages to generate an estimated gain
Implementation Method 4
Buzzers are sound-generating components... When the buzzer is powered, a metal diaphragm inside the buzzer vibrates within a resonance chamber to produce sound
Data Source
AI summary
A buzzer driving system is electrically connected to a buzzer and includes a driving unit, a boost unit, and a gain estimation unit. The driving unit includes a gain control circuit that adjusts the gain of an audio signal based on a gain factor and outputs a driving voltage to the buzzer based on the adjusted audio signal. The boost unit is electrically connected to the driving unit and boosts an input voltage to generate a working voltage for the driving unit. The gain estimation unit is electrically connected to both the driving unit and the boost unit and is configured to generate a plurality of stepwise voltages based on the working voltage. The gain estimation unit sequentially compares the input voltage with each of the stepwise voltages to generate an estimated gain. The gain factor used by the gain control circuit is determined based on this estimated gain.