Loudspeaker Auto-Equalization for In-Room Bass Uniformity
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Solution Overview
Problem
Loudspeaker devices face issues with spectral uniformity due to resonances in rooms, leading to uneven bass reproduction, as sound power output is affected by room dimensions and positioning, resulting in weak or overpowering bass in different regions.
Innovation Solution
A sound power optimization system comprising a speaker driver, a microphone to measure near-field sound pressure, and a controller that determines diaphragm velocity to automatically calibrate sound power levels, adjusting them based on acoustic environment conditions to enhance total sound power output and improve spectral uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If loudspeaker devices are placed in rooms with resonances, then sound power output is affected by room dimensions and positioning, but spectral uniformity deteriorates leading to uneven bass reproduction
Solution Approach 1:
The system uses a microphone to measure the actual sound pressure in the room and feeds this information back to a controller that adjusts the speaker driver's output. This closed-loop feedback mechanism allows the system to compensate for room resonances and positioning effects, maintaining spectral uniformity while optimizing sound power output for the specific acoustic environment.
Solution Approach 2:
The system dynamically changes the electrical parameters (voltage, current) supplied to the speaker driver based on measured acoustic conditions. By adjusting these parameters in real-time according to room characteristics, the system optimizes sound power output while compensating for resonances and maintaining spectral uniformity across different listening positions.
2Stability of the object's composition
If automatic calibration based on near-field sound pressure measurement is implemented, then spectral uniformity is improved, but device complexity increases
Solution Approach 1:
The loudspeaker system performs its own acoustic calibration using an integrated microphone and controller. The system automatically measures near-field sound pressure, determines diaphragm velocity, and adjusts its output without requiring external measurement equipment or manual calibration procedures. This self-service approach improves spectral uniformity while minimizing the increase in device complexity.
Solution Approach 2:
The microphone serves multiple functions: it measures near-field sound pressure for calibration, characterizes the acoustic environment, and enables real-time optimization of sound power output. By making the measurement component multi-functional, the system achieves improved spectral uniformity without proportionally increasing device complexity.
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 effectively optimizes sound power output, providing smooth bass response and increased clarity by automatically adjusting sound levels based on room conditions and positioning, reducing the impact of resonances and improving overall listening experience.
Implementation Method 1
a microphone configured to obtain a measurement of a near-field sound pressure of the speaker driver
Implementation Method 2
The controller is configured to determine a velocity of a diaphragm of the speaker driver
Implementation Method 3
A loudspeaker produces sound when connected to an integrated amplifier, a television (TV) set, a radio, a music player, an electronic sound producing device
Data Source
AI summary
One embodiment provides a device comprising a speaker driver, a microphone configured to obtain a measurement of a near-field sound pressure of the speaker driver, and a controller. The controller is configured to determine a velocity of a diaphragm of the speaker driver, and automatically calibrate sound power levels of audio reproduced by the speaker driver based on the velocity and the measurement of the near-field sound pressure to automatically adjust the sound power levels to an acoustic environment of the device.