Hearing Amplifier Voltage Prediction for Stable Acoustic Output
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Solution Overview
Problem
Amplifier systems in hearing devices experience variations in acoustical signals due to gain variations caused by supply voltage fluctuations, leading to degraded sound quality and noise introduction.
Innovation Solution
An amplifier system that includes a digital signal processor, a controller unit, and an analog-to-digital converter to measure and predict supply voltage variations, generating a compensating signal to minimize gain fluctuations and maintain consistent acoustical signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If predictive feedback compensation is implemented to suppress distortion caused by supply voltage variations, then sound quality is improved, but device complexity increases due to additional measuring circuitry and compensation algorithms
Solution Approach 1:
The system performs preliminary measurement of supply voltage variations and predicts future voltage deviations before they affect the amplifier output. The controller unit measures the supply voltage in advance, predicts offset modes using fitting algorithms, and generates compensating signals proactively, allowing the digital signal processor to pre-adjust the acoustical signal to counteract anticipated gain variations.
Solution Approach 2:
The system implements a feedback mechanism where the controller unit continuously monitors the supply voltage, compares it against predicted values, and adjusts the compensating signal accordingly. The measured supply voltage is fed back to update the fitting model, enabling the system to adapt to changing voltage patterns and improve prediction accuracy over time.
2Measurement precision
If continuous measurement of supply voltage is performed to accurately predict offset modes, then compensation precision is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous measurement, the system performs supply voltage measurements periodically at specific time points relevant to predicting offset modes. The controller unit requests measured voltage during specific time periods when offset modes are expected to occur, based on enablement signals and fitted patterns, reducing the overall measurement frequency while maintaining prediction accuracy.
Solution Approach 2:
The system performs preliminary measurements at strategically chosen time points that provide sufficient information for predicting future offset modes. By measuring the supply voltage in advance at critical moments and using fitting algorithms to extrapolate future behavior, the system achieves accurate compensation without requiring constant monitoring.
3Stability of the object's composition
If the system predicts and compensates for offset modes in real-time, then acoustical signal stability is improved, but processing time increases due to fitting and prediction calculations
Solution Approach 1:
The system performs preliminary fitting of measured voltage data to establish prediction models during periods when offset modes are not actively occurring. By pre-calculating fitting parameters and storing them for quick retrieval, the system minimizes real-time processing requirements during critical compensation moments.
Solution Approach 2:
The system creates simplified copies or representations of the complex fitting and prediction calculations by pre-computing lookup tables or storing fitted model parameters. The controller unit uses these pre-processed data structures to quickly determine compensating signals without performing full fitting calculations in real-time, significantly reducing processing delays.
Data Source
AI summary
The disclosure presents a method and an amplifier system for minimizing variation in an acoustical signal caused by variation in gain of an amplifier, comprising a battery for providing a supply voltage to the amplifier, a digital signal processor for providing the acoustical signal to the amplifier, a controller unit receiving an enablement signal when the supply voltage is in an offset mode, and based on the enablement signal requesting a measured voltage during a time period, and a first analog-to-digital converter configured for measuring the supply voltage to the amplifier when receiving the request from the controller unit or the first analog-to-digital converter is configured for measuring the supply voltage to the amplifier continuously, and where variations in the measured voltage relates to variations in the supply voltage during the time period. Furthermore, the controller unit is configured to predict offset modes (i.e. changes) in the supply voltage based on the enablement signals and a fitting of the measured voltages, and wherein the controller unit is configured to generate a compensating signal based on the fitting and transmit the compensating signal to the digital signal processor, the digital signal processor is then configured to minimize variation in the acoustical signal at the output of the amplifier by compensating the variation in gain of the amplifier based on the compensating signal.