Hearing Device Reversible Transducer In-Situ Fitting
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Solution Overview
Problem
Current hearing device fitting methods are uncertain due to individual ear characteristics and require additional equipment and time-consuming steps, leading to translational errors and varying acoustic fittings.
Innovation Solution
A hearing device with a reversible output transducer that measures sound pressure levels and determines electric impedance to estimate acoustic load, allowing for in-situ fitting without additional equipment, using the device's natural input signals and correcting signal processing for optimal fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external measuring equipment is used to measure individual ear characteristics, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The hearing device uses its own output transducer in reverse mode to perform self-measurement of ear canal acoustic impedance, eliminating the need for external measuring equipment. The device serves both its primary function of delivering sound and its measurement function using the same transducer component.
Solution Approach 2:
The output transducer serves dual purposes: it acts as both the sound delivery transducer during normal operation and as the measurement transducer for characterizing ear canal acoustics. This multi-functionality eliminates the need for separate external measurement devices.
2Measurement precision
If real ear measurements with probe tubes are performed, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The hearing device performs self-measurement of ear canal characteristics using its own transducer, eliminating the need for separate probe tube measurements. This integration of measurement functionality into the device itself reduces the time required for fitting procedures.
3Measurement precision
If RECD approach is used, then measurement precision is improved, but translational errors increase
Solution Approach 1:
The patent uses the electrical impedance of the output transducer as an intermediary parameter to indirectly characterize the ear canal acoustics. This electrical measurement serves as a mediator that reflects acoustic load conditions without requiring direct acoustic measurements that introduce translational errors.
Solution Approach 2:
The patent replaces mechanical/acoustic measurement systems (probe tubes, couplers) with an electrical measurement system. By measuring electrical impedance changes of the transducer, the system substitutes direct acoustic measurements with electrical equivalents that are easier to measure accurately in situ.
4Adaptability or versatility
If hearing device is placed in ear canal, then adaptability is improved, but measurement precision deteriorates due to varying resonances
Solution Approach 1:
The system performs measurements dynamically during normal hearing device operation rather than requiring separate static measurement procedures. The transducer impedance is measured while the device is actually worn, capturing the true acoustic conditions including resonances and leaks that occur during normal use.
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 provides a precise and efficient fitting process that adapts to individual ear characteristics, eliminating the need for external measurement tools and ensuring consistent acoustic performance.
Implementation Method 1
an output transducer for—in a normal mode of operation—converting an electric output signal to an acoustic output sound... convert a sound pressure level to an electric signal
Data Source
AI summary
The application relates to a hearing device comprising an input unit for providing an electric input audio signal, a configurable signal processing unit for processing an audio signal and providing a processed audio signal, and a reversible output transducer for converting an electric output signal to an acoustic output sound. The hearing device further comprises a measurement unit configured to convert a sound pressure level to an electric signal, termed the measurement signal, and a control unit configured to determine a present electric impedance of the output transducer or a measure indicative of said present electric impedance from said measurement signal. This has the advantage that no additional microphone or other measurement equipment is needed to provide a (e.g. in-situ) real ear measurement of sound pressure level. The invention may e.g. be used to control audio signal processing in hearing aids, headsets, ear phones, active ear protection systems, or combinations thereof.