Acoustic Receiver Load Diagnostics via Signal Comparison
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Solution Overview
Problem
Acoustic devices with armature-based receivers face performance issues due to sub-optimal coupling and obstructions, leading to changes in acoustic load, which affect sound pressure levels and distortion, and existing technologies lack effective methods for diagnosing and compensating for these changes in real-time.
Innovation Solution
An armature-based acoustic receiver system that uses pre-distorted electrical excitation signals and electro-acoustic transducers to detect changes in acoustic load by comparing measured transfer functions to reference data, allowing for real-time compensation and notification of obstructions or coupling issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic devices are used with armature-based receivers, then sound output is achieved, but performance deteriorates due to sub-optimal coupling and obstructions causing acoustic load changes
Solution Approach 1:
The patent implements a feedback mechanism where the electrical circuit continuously monitors the acoustic output signal and compares it to reference information. When deviations are detected indicating acoustic load changes, the system provides notifications or adjusts operation. This closed-loop feedback approach enables real-time detection and compensation of performance degradation caused by coupling issues and obstructions.
Solution Approach 2:
The patent replaces physical inspection or mechanical diagnostic methods with electrical and acoustic field-based detection. By using the electrical circuit to analyze electrical output signals and acoustic characteristics, the system can diagnose acoustic load changes without mechanical intervention, enabling non-intrusive real-time monitoring of coupling quality and obstruction detection.
2Reliability
If real-time diagnosis of acoustic load changes is implemented, then performance compensation is enabled, but device complexity increases
Solution Approach 1:
The patent makes the existing electrical circuit perform multiple functions: it continues to drive the armature-based receiver while simultaneously monitoring acoustic output, comparing signals to reference information, and diagnosing acoustic load changes. By integrating these diagnostic capabilities into the existing control circuitry rather than adding separate dedicated diagnostic hardware, the system achieves real-time performance compensation with minimal increase in overall device complexity.
Solution Approach 2:
The system uses its own operational signals (electrical input and acoustic output signals) for self-diagnosis. The electrical circuit monitors its own performance by analyzing the relationship between input signals and acoustic output, comparing against stored reference information. This self-service approach eliminates the need for external diagnostic equipment or additional sensors, reducing system complexity while enabling continuous real-time monitoring and compensation.
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 improves sound pressure levels and reduces distortion by accurately diagnosing and adjusting for changes in acoustic load, ensuring consistent performance and user experience.
Implementation Method 1
The receiver generally comprises a motor having a coil to which an electrical excitation signal is applied. The coil is disposed about a portion of an armature (also known as a reed), a movable portion of which is disposed in equipoise between magnets... Application of the excitation or input signal to the receiver coil modulates the magnetic field, causing deflection of the reed between the magnets.
Implementation Method 2
converting the acoustic output signal to an electrical output signal that is related to a sound pressure of the acoustic signal using an electro-acoustic transducer
Data Source
AI summary
An acoustic apparatus and method produces an acoustic signal in response to an electrical input signal applied to an acoustic receiver. The acoustic signal is converted to an electrical output signal that is proportional to a sound pressure of the acoustic signal, using an electro-acoustic transducer. In some embodiments the apparatus and method determine whether there is a change in the acoustic signal indicative of a change in an acoustic load coupled to the receiver by comparing the electrical output signal to reference information. The change in acoustic load, in one example, is attributable to ear wax accumulation in an output of the acoustic receiver or acoustic passage in the ear canal of a user or is attributable to seal leakage.