Vehicle Notification Speaker Calibration for Stable Sound Pressure
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Solution Overview
Problem
Existing notification devices face challenges in reliably meeting sound pressure emission standards due to manufacturing variations and aging, leading to potential noise pollution and cabin noise, with complex management of correction amounts complicating adjustments.
Innovation Solution
A notification sound generation device incorporating a speaker, controller, and correction unit that corrects sound signals based on physical quantities such as resistance values, sound pressure values, or displacement amounts to stabilize sound pressure output, reducing the need for excessive margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound pressure margin is increased to satisfy emission standards reliably, then compliance with sound pressure emission standards is improved, but noise pollution and cabin noise increase
Solution Approach 1:
The patent applies parameter changes by adjusting the sound signal based on measured physical quantities (resistance value, sound pressure value, or displacement amount) of the speaker. The correction unit modifies signal parameters dynamically to achieve reliable emission standard compliance without excessive sound pressure margin, thereby reducing noise pollution and cabin noise while maintaining reliability.
2Manufacturing precision
If correction amounts are managed individually for each speaker, then sound pressure variation correction is improved, but management complexity increases
Solution Approach 1:
The patent implements self-service by enabling each speaker to automatically measure its own physical quantities (resistance value, sound pressure value, or displacement amount) and generate corresponding correction amounts. The correction unit then applies these self-generated corrections to the sound signal, eliminating the need for complex external management systems while achieving precise sound pressure variation correction.
3Reliability
If sound pressure margin is increased to account for manufacturing variations and aging, then reliability of meeting emission standards is improved, but the speaker volume becomes excessively large
Solution Approach 1:
The patent applies preliminary action by measuring the physical quantities (resistance value, sound pressure value, or displacement amount) of each speaker during assembly or initialization and pre-calculating the appropriate correction amount. This preliminary correction data is stored and applied during operation, ensuring reliable meeting of emission standards without requiring excessive speaker volume to accommodate manufacturing variations and aging.
Data Source
AI summary
A notification sound generation device includes a speaker, a controller, a resistor, and a correction unit. The speaker is configured to generate a notification sound to surroundings of a vehicle. The controller is configured to output a sound signal that causes the speaker to generate the notification sound. The resistor has a resistance value corresponding to a correction amount for correcting a sound pressure variation of the speaker or a resistance value corresponding to a sound pressure value of the speaker. The correction unit is configured to correct the sound signal based on a physical quantity correlated with the resistance value of the resistor.