Audio Amplifier Fault Detection With DC Offset and Gain Matching
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Solution Overview
Problem
Current fault detection methods for sound output devices are not precise enough, as they primarily rely on comparing waveforms of input and output signals without effectively accounting for DC offset and gain mismatches, which can lead to inaccurate fault determination.
Innovation Solution
A semiconductor device with detection sections that remove DC offset components, match phases and gains of input and output signals, and compare waveforms to detect mismatches, enabling more precise fault detection by identifying discrepancies in DC offset and gain between input and output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If waveform comparison is performed without DC offset removal and gain matching, then the detection process is simpler, but the fault detection precision deteriorates
Solution Approach 1:
The patent applies preliminary action by performing DC offset removal and gain matching before waveform comparison. The detection section first removes DC offset components from both input and output signals, then matches their gains, and finally compares the waveforms. This preliminary processing ensures accurate fault detection by eliminating confounding factors that would otherwise mask actual faults.
Solution Approach 2:
The detection process is segmented into distinct functional stages: DC offset removal, gain matching, and waveform comparison. Each stage handles a specific aspect of signal processing independently, allowing for precise control and analysis of each processing step's contribution to overall detection accuracy.
2Measurement precision
If DC offset components are removed and gains are matched before waveform comparison, then the fault detection accuracy is improved, but the detection process becomes more complex
Solution Approach 1:
The patent implements preliminary action by preparing the signals in advance through DC offset removal and gain matching before the actual waveform comparison. This ensures that the comparison is performed on normalized signals, improving accuracy while organizing the complexity into a systematic preliminary processing stage.
Solution Approach 2:
The patent changes key parameters of the signals before comparison: removing DC offset components (changing the signal's baseline parameter) and matching gains (changing the signal's amplitude parameter). These parameter changes standardize the signals for accurate comparison while making the complexity manageable through systematic parameter control.
3Reliability
If only waveform comparison is performed, then the detection method is simpler, but the ability to detect DC offset mismatches deteriorates
Solution Approach 1:
The detection method is segmented to separately analyze different signal characteristics. The patent compares waveforms to detect general faults while also specifically analyzing DC offset components and gain differences. This segmentation allows reliable detection of various fault types by examining each aspect independently.
Solution Approach 2:
The patent monitors multiple parameters simultaneously: waveform shape, DC offset level, and gain magnitude. By tracking these different parameters, the system achieves reliable fault detection across various failure modes while managing complexity through systematic multi-parameter monitoring.
Data Source
AI summary
A semiconductor device is provided, the device including a first detection section having a removal section to remove DC offset components included in each of an input signal and an output signal output from an amplification section that amplifies the input signal, and a correction section configured to perform correction to match phases of the input signal and the output signal from which the DC offset components have been removed, and to match gains of the input signal and of the output signal, the first detection section comparing a waveform of the input signal to a waveform of the output signal, and a second detection section to detect a mismatch between the DC offset component included in the input signal that is input into the removal section and the DC offset component included in the output signal that is input into the removal section.