Vehicle Loudspeaker Low-Frequency Equalization Against Distortion
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Solution Overview
Problem
Existing loudspeaker systems struggle to extend bandwidth, reduce distortion, and protect against undesirable phenomena such as distortion and unwanted vibrations, particularly in vehicle audio systems.
Innovation Solution
A method involving calibration, measurement, and signal processing to optimize loudspeaker performance, including acoustic signature determination, filter application, and dynamic equalization to manage low frequencies, using a device with calibration, measurement, and compensation means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the volume level of low frequencies is increased to extend bandwidth, then the frequency response becomes flatter, but distortion and unwanted vibrations increase
Solution Approach 1:
The patent applies preliminary equalization filtering before the loudspeaker reproduces the audio signal. The system pre-processes the low frequency signal by applying an equalization filter designed to flatten the frequency response, so that when the signal reaches the loudspeaker, it already accounts for the speaker's frequency characteristics. This preliminary action prevents distortion and unwanted vibrations from occurring in the first place, rather than correcting them after they occur.
2Manufacturing precision
If equalization filtering is applied to flatten frequency response, then bandwidth is extended, but the complexity of the audio chain increases
Solution Approach 1:
The equalization filter in the patent serves multiple functions simultaneously: it flattens the frequency response of the loudspeaker, extends the usable bandwidth, and reduces distortion and unwanted vibrations. By designing a single filter system that accomplishes all these objectives together rather than requiring separate systems for each function, the patent achieves multi-functionality that offsets the added complexity with consolidated design.
3Object-generated harmful factors
If measurement and calibration steps are added to optimize performance, then distortion is reduced, but the time required for setup increases
Solution Approach 1:
The patent employs an automated measurement and calibration system that performs the equalization optimization process without requiring manual intervention. The system automatically measures the loudspeaker's frequency response using a microphone and signal processor, analyzes the data, and generates the appropriate equalization filter parameters. This self-service approach reduces calibration time by eliminating manual setup while still achieving optimal distortion reduction.
Data Source
AI summary
A method for managing low frequencies of a loudspeaker located on board a vehicle. The method includes: a step of calibrating an audio system of the vehicle including the loudspeaker, to achieve a set of specifications; a step of measuring acoustic indicators of the loudspeaker including distortion indicator, the measuring step including a step of characterizing the loudspeaker by means of a measuring system, a step of determining a frequency response of the audio system at each volume level, a step of determining a distortion indicator and an indicator of unwanted vibrations for each volume level; a step of managing low frequencies, employing the acoustic indicators, the frequency response at each volume level and the indicators of unwanted vibrations, in the course of which step rendering of the low frequencies by the loudspeaker is optimized. A device for implementing the method is also provided.