Speaker Excursion Compensation Circuit for Over-Excursion Control
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Solution Overview
Problem
Existing audio signal processing systems fail to effectively prevent over-excursion in loudspeakers, leading to distorted sound and potential damage due to nonlinear damping and voice-coil damage.
Innovation Solution
A circuit and method for audio signal processing with excursion estimation compensation, utilizing a delay circuit, compensation filter, excursion estimator, and gain adjustment circuit to determine and adjust the gain based on estimated speaker excursion to prevent over-excursion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the speaker cone moves to produce sound waves, then sound is generated, but the excursion may exceed the diaphragm's limits causing nonlinear damping, distorted sound, and damage to the loudspeaker
Solution Approach 1:
The patent applies preliminary action by estimating the speaker excursion before it actually occurs. The excursion estimator calculates the predicted excursion based on the audio signal and speaker characteristics, allowing the system to take preventive measures before damage can happen. This enables the loudspeaker to operate reliably within safe limits while maintaining sound quality.
2Reliability
If the audio signal is processed to prevent over-excursion, then speaker protection is achieved, but the sound quality may be affected due to signal modification
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the audio signal parameters based on the estimated excursion. The gain adjustment circuit modifies the signal amplitude in a controlled manner, changing parameters only when necessary to prevent over-excursion. This allows the system to protect the speaker while maintaining natural sound quality by making minimal, targeted modifications rather than broad signal distortion.
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 over-excursion by accurately estimating speaker movement and adjusting gain, thereby protecting the loudspeaker and maintaining sound quality.
Implementation Method 1
a delay circuit for delaying a digital audio signal to output a delayed digital audio signal
Implementation Method 2
a compensation filter for generating a compensated digital audio signal according to the digital audio signal for excursion estimation compensation for a speaker type
Implementation Method 3
an excursion estimator for determining an estimated excursion signal for the speaker type according to the compensated digital audio signal
Implementation Method 4
a gain determination circuit for generating a gain setting signal according to the estimated excursion signal and a threshold value
Implementation Method 5
a gain adjustment circuit for generating an adjusted digital audio signal according to the gain setting signal and the delayed digital audio signal
Data Source
AI summary
Circuit, method for audio signal processing with excursion estimation compensation, and non-transitory storage medium are provided. The circuit comprises a delay circuit, compensation filter, excursion estimator, peak detector, gain determination circuit, and gain adjustment circuit. The delay circuit is for delaying a digital audio signal to output a delayed digital audio signal. The compensation filter is for generating a compensated digital audio signal according to the digital audio signal for excursion estimation compensation for a speaker type. The excursion estimator is for determining an estimated excursion signal for the speaker type according to the compensated digital audio signal. The gain determination circuit is for generating a gain setting signal according to the estimated excursion signal and a threshold value. The gain adjustment circuit is for generating an adjusted digital audio signal according to the gain setting signal and delayed digital audio signal.