Horn Device Frequency Control for Sound Pressure Stability
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Solution Overview
Problem
The horn device experiences a decrease in sound pressure due to changes in ambient temperature or voltage, causing the vibration frequency of the diaphragm to deviate from the resonance frequency.
Innovation Solution
A horn device with a control system that adjusts the vibration frequency and duty ratio of the coil based on temperature and current measurements to maintain resonance frequency, using a temperature measurement part, current measurement part, power supply device, driving part, and control part to output PWM signals, ensuring consistent sound pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the horn device uses a fixed vibration frequency, then the structure is simple, but the sound pressure decreases when temperature or voltage changes
Solution Approach 1:
The patent implements a feedback control system where the control part receives temperature information from the temperature measurement part and current information from the current measurement part, then adjusts the vibration frequency and duty ratio based on this feedback to maintain resonance frequency and prevent sound pressure decrease
Solution Approach 2:
The patent makes the vibration frequency dynamic by adjusting it according to temperature changes. The control part changes the vibration frequency based on temperature information to track the resonance frequency, transforming a static system into a dynamic adaptive system
2Reliability
If the vibration frequency is adjusted according to temperature, then the sound pressure is maintained, but the device complexity increases
Solution Approach 1:
The patent changes the vibration frequency parameter according to temperature variations. The control part adjusts the vibration frequency based on temperature information to maintain resonance, and also adjusts the duty ratio based on current information, implementing parameter adaptation to environmental changes
Solution Approach 2:
The horn device performs self-adjustment through the control part that automatically modifies vibration frequency and duty ratio based on temperature and current measurements, enabling the system to self-correct and maintain optimal performance without external intervention
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
Prevents the decrease in sound pressure by maintaining the vibration frequency at the resonance frequency despite changes in ambient temperature or voltage, thereby ensuring consistent sound production.
Implementation Method 1
a temperature measurement part configured to measure a temperature
Implementation Method 2
a current measurement part configured to measure a current value which flows through the coil
Implementation Method 3
the control part is configured to energize the coil and vibrate the diaphragm at a predetermined frequency by magnetic force of the coil
Implementation Method 4
resonate by a resonator the sound produced by the vibration to produce sound
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A horn device (A, B), which can prevent the decrease of sound pressure is provided. The horn device (A, B) which resonates, by a resonator (1), sound produced by vibrating a diaphragm (21), and comprises a control part (34, 34B) which vibrates the diaphragm (2), and a temperature measurement part (30); the control part (34, 34B) changes a vibration frequency which vibrates the diaphragm (21) according to a temperature measured by the temperature measurement part (30).