Microspeaker Excursion Prediction Using Direct Voltage Conversion
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Solution Overview
Problem
Conventional speaker protection methods for microspeakers are cumbersome and not well-suited for a wide range of speaker types, as they require conversion from electrical to mechanical models, which is inefficient and prone to errors due to varying mechanical parameters.
Innovation Solution
A voltage-to-excursion model that directly converts electrical signals to estimated excursion, allowing for modeling of different speaker types without the need for an intermediate electrical model, using error signals and feedback to update the adaptive filter, and predicting mechanical parameters like excursion to prevent over-excursion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrical-to-mechanical model conversion is used, then speaker protection can be implemented, but the process becomes cumbersome and requires mechanical parameters that are not available for all speaker types
Solution Approach 1:
The patent replaces the conventional electrical-to-mechanical model conversion process with a direct voltage-to-excursion electrical model. This substitution eliminates the need for mechanical parameters (Mms, Kms, Rms) and mechanical model conversion, thereby reducing device complexity while maintaining speaker protection capability. The direct electrical model uses only electrical parameters (Rs, Le, Ble) that are available for all speaker types.
Solution Approach 2:
The patent extracts and removes the cumbersome mechanical model conversion step from the conventional protection process. By taking out the electrical-to-mechanical conversion requirement and replacing it with a direct electrical model, the solution simplifies the overall process while preserving the essential speaker protection function.
2Reliability
If electrical-to-mechanical model conversion is used, then speaker protection can be achieved, but it is not suitable for a wide range of speaker types including sealed and vented box varieties
Solution Approach 1:
The patent creates a universal voltage-to-excursion electrical model that functions across all speaker types (sealed box, vented box, ported, etc.) without requiring type-specific mechanical parameters. This universal electrical model achieves multi-functionality by adapting to different speaker configurations using only electrical parameters, thereby improving adaptability while maintaining protection reliability.
Solution Approach 2:
The patent changes the parameter basis from mechanical parameters (Mms, Kms, Rms) to electrical parameters (Rs, Le, Ble). This parameter transformation enables the model to work with all speaker types since electrical parameters are universally available, eliminating the limitation of mechanical parameter requirements that restricted applicability to specific speaker varieties.
3Device complexity
If direct voltage-to-excursion electrical model is used, then speaker protection is simplified and applicable to all speaker types, but requires developing a new model approach
Solution Approach 1:
The patent performs preliminary action by pre-defining the voltage-to-excursion electrical model structure and parameters before actual speaker protection is needed. The model framework, including the relationship between voltage, current, and excursion using electrical parameters only, is established in advance, making implementation straightforward and reducing the apparent complexity when deploying the solution.
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
This approach improves sound quality and extends the lifespan of microspeaker components by accurately predicting excursion and preventing damage, allowing for effective speaker protection across various types, such as sealed, ported, and vented speakers.
Implementation Method 1
A voltage-to-excursion model that directly converts electrical signals to estimated excursion
Implementation Method 2
Speakers reproduce sounds by driving a cone forwards and backwards to produce soundwaves
Data Source
AI summary
A speaker model may implement a direct voltage-to-excursion model in an adaptive filter for modeling the speaker without developing a first electrical-only model and then converting the model to a mechanical model. The voltage-to-excursion model may allow for modeling of different kinds of speakers, such as sealed, ported, or vented speakers. A transfer function may be developed in the adaptive filter for the voltage-to-excursion model, and that transfer function re-used for prediction of excursion values based on an audio signal. Speaker protection may be performed to take steps to prevent speaker damage when a predicted excursion value exceeds safe limits. The voltage-to-excursion model may operate in displacement or displacement-related domains (e.g., velocity and back emf).