Hearing Apparatus Oscillator Self-Trimming Circuit
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Solution Overview
Problem
Hearing devices face challenges in maintaining precise oscillation frequency over time due to manufacturing tolerances, temperature effects, and aging, which affects wireless programming and data transmission precision, especially in devices without conventional programming interfaces.
Innovation Solution
A hearing apparatus with an oscillator and a trimming facility that automatically adjusts the oscillation frequency using a capacity matrix, frequency counter, window comparator, and flow control unit, allowing for self-trimming and compensation of frequency drifts, enabling wireless programmability without external assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a one-off trimming of the resonance circuit is performed during manufacturing, then manufacturing precision is improved, but the oscillation frequency drifts due to temperature effects and aging
Solution Approach 1:
The patent transforms the static one-off trimming approach into a dynamic self-adjusting system. The control facility continuously monitors the oscillation frequency and automatically adjusts the capacity matrix in real-time to compensate for temperature effects and aging, making the trimming process adaptive rather than fixed.
Solution Approach 2:
The hearing device performs automatic self-trimming through its internal control facility without requiring external programming devices or manual intervention. The system monitors its own frequency drift and autonomously adjusts the resonance circuit parameters to maintain precision.
2Ease of operation
If wireless programming is implemented without conventional programming interfaces, then ease of operation is improved, but the trimming cannot be controlled by external programming devices
Solution Approach 1:
The hearing device performs automatic self-trimming through its internal control facility without requiring external programming devices or manual intervention. The system monitors its own frequency drift and autonomously adjusts the resonance circuit parameters to maintain precision.
Solution Approach 2:
The control facility serves multiple functions: it enables automatic self-trimming for frequency stability, supports wireless programming operations, and maintains compatibility with modulation methods requiring high frequency precision. This multi-functionality resolves the contradiction between simplified operation and retained flexibility.
3Measurement precision
If high absolute precision of frequency is required for modulation methods like QPSK or BPSK, then measurement precision is improved, but temperature effects and aging cause frequency deviations
Solution Approach 1:
The control facility continuously monitors the oscillation frequency and uses this feedback information to detect deviations caused by temperature effects and aging. Based on this feedback, the system automatically adjusts the capacity matrix to compensate for drift and maintain the required frequency precision for high-order modulation schemes.
Solution Approach 2:
The patent transforms the static one-off trimming approach into a dynamic self-adjusting system. The control facility continuously monitors the oscillation frequency and automatically adjusts the capacity matrix in real-time to compensate for temperature effects and aging, making the trimming process adaptive rather than fixed.
4Reliability
If automatic self-trimming is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The control facility integrates multiple functions into a single unit: frequency monitoring, drift detection, capacity matrix adjustment control, and wireless programming coordination. By merging these functions, the patent reduces overall system complexity while maintaining the benefits of automatic self-trimming.
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 solution ensures long-lasting precision in oscillation frequency trimming, simplifies manufacturing, reduces costs, and allows for self-sufficient wireless communication and programming of hearing devices, effectively addressing temperature and aging-related frequency deviations.
Implementation Method 1
The oscillator preferably has an LC oscillating circuit, the resonance capacity of which can be trimmed by a capacity matrix of the trimming facility
Implementation Method 2
The LC oscillator is started here and the current oscillator frequency is measured by a frequency counter integrated onto the hearing device chip
Data Source
AI summary
The aim is for an LC oscillator circuit of a hearing apparatus to be operated on a sustained basis in a desired frequency range. To this end, a hearing apparatus is proposed having an oscillator and a trimming facility for trimming the oscillation frequency of the oscillator. A control facility controls the oscillation frequency of the oscillator with the aid of the trimming facility in accordance with a predetermined desired value. An automatic self-trimming of a wireless transmission system in a hearing apparatus and in particular in a hearing device is thus possible.