Signal Feedback Calibration for Distortion Extraction Accuracy
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Solution Overview
Problem
Existing signal processing devices face challenges in accurately extracting distortion components using feedback technology due to issues with amplitude, DC offset, and delay adjustments, particularly with the use of variable resistors which are prone to deterioration and variability among users.
Innovation Solution
The signal processing device employs a controller to adjust parameters such as DC offset, amplitude, and delay without using variable resistors, by determining these parameters based on specific thresholds and test signals, ensuring accurate extraction of distortion components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a variable resistor is used to adjust amplitude and DC offset of the feedback signal, then the adjustment can be made manually, but the resistance value shifts due to aged deterioration and vibration, making it difficult to accurately extract the distortion component
Solution Approach 1:
The patent replaces the mechanical variable resistor system with a digital signal processing system. The feedback signal undergoes digital gain adjustment and DC offset correction through electronic circuits and algorithms, eliminating mechanical components that deteriorate over time. This substitution ensures stable, repeatable parameter adjustments without the drift issues inherent in mechanical systems.
Solution Approach 2:
The patent implements a feedback mechanism where the output signal is fed back through adjustment circuits that apply gain correction and DC offset compensation. The adjusted feedback signal is then compared with the input signal to accurately extract distortion components. This closed-loop feedback system ensures continuous monitoring and correction, maintaining extraction accuracy despite environmental variations.
2Device complexity
If manual adjustment of variable resistor is performed, then the setup is simple, but the adjustment varies depending on the person making the adjustment
Solution Approach 1:
The patent replaces manual mechanical adjustment with automated digital signal processing. The system uses electronic gain control and digital DC offset correction that can be precisely controlled through software or microcontroller, eliminating human variability. This automation ensures that the same adjustment parameters can be consistently reproduced across different operators and sessions.
Solution Approach 2:
The patent transforms the adjustment parameters from mechanical resistance values to digital control parameters. By using digital gain factors and programmable DC offset values, the system achieves precise and repeatable adjustments. These digital parameters can be stored, recalled, and modified without the physical wear and variability associated with mechanical components.
3Object-generated harmful factors
If feedback technology is used to extract distortion components, then distortion and noise can be reduced, but accurate extraction requires precise amplitude and DC offset matching which is difficult to achieve with conventional methods
Solution Approach 1:
The patent replaces mechanical amplitude and DC offset adjustment with digital signal processing techniques. The feedback signal undergoes digital gain adjustment to match the amplitude of the input signal, and digital DC offset correction to align the baseline. This electronic-digital approach provides precise, programmable control over signal parameters, enabling accurate matching that is difficult to achieve with mechanical components.
Solution Approach 2:
The patent uses programmable parameter adjustment to dynamically control the feedback signal characteristics. Digital gain factors and DC offset values can be precisely set and adjusted to match the input signal parameters. This flexibility allows for accurate amplitude and offset matching, enabling effective distortion component extraction while maintaining signal integrity throughout the feedback loop.
Data Source
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AI summary
The signal processing device (1) includes: an offset adjuster (51); an amplitude adjuster (52); and a delay adjuster (53), wherein the offset adjuster (51) adjusts the DC offset using a first parameter regarding the DC offset determined based on an output of the offset adjuster (51) which is output when no signal is input to the signal processing circuit (20) by the subtractor (10), the amplitude adjuster (52) adjusts the amplitude using a second parameter regarding the amplitude determined based on (i) an output of the amplitude adjuster (52) which is output when a first test signal is input to the signal processing circuit (20) and (ii) the first test signal, and the delay adjuster (53) adjusts the delay using a third parameter regarding the delay determined based on the difference signal that is an output of the subtractor (71) when a second test signal is input to the signal processing circuit (20).