Envelope Detection Using Sampling Signal Differences
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Solution Overview
Problem
Existing envelope detection methods face challenges in circuit complexity and accuracy, particularly in analog circuits, and are prone to reduced accuracy due to biasing issues, except for frequency band filtering.
Innovation Solution
A method and apparatus for detecting an envelope using a difference between sampling signals, which simplifies circuit implementation by employing a Sequential Difference Envelope Detection (SDED) technique with sampling signals at equal time intervals, allowing for robust envelope detection without biasing and reduced circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal processing schemes such as band-pass filter or low-pass filter are used for envelope detection, then envelope detection accuracy is improved, but circuit complexity increases
Solution Approach 1:
The patent segments the envelope detection process into discrete sampling operations at specific time points (t1, t2, t3, t4) rather than using continuous filtering. By dividing the signal processing into distinct sampling instances and computing envelope values through algebraic operations on these discrete samples, the method achieves accurate envelope detection without requiring complex continuous filtering circuits.
Solution Approach 2:
The patent replaces the mechanical/filter-based signal processing system with a computational approach. Instead of using physical band-pass or low-pass filters that require complex circuit implementation, the invention uses digital sampling and algebraic calculations (sum and difference of sampled values) to achieve envelope detection, substituting mechanical filtering with mathematical computation.
2Device complexity
If analog circuit schemes such as diode and capacitor are used for envelope detection, then circuit complexity is reduced, but envelope detection accuracy deteriorates
Solution Approach 1:
The patent replaces simple analog circuit elements (diodes and capacitors) with a digital sampling and computation system. By using multiple sampling points and algebraic operations, the invention achieves superior envelope detection accuracy compared to basic analog circuits, while maintaining relatively simple implementation through discrete sampling rather than complex analog component networks.
Solution Approach 2:
The patent changes the detection parameters by using multiple sampling time points (t1, t2, t3, t4) with specific interval relationships rather than relying on the continuous operation of simple analog components. This parameter-based approach (sampling at strategically chosen moments) enables accurate envelope detection without requiring sophisticated analog circuitry.
3Device complexity
If biasing scheme is used for envelope detection, then circuit complexity is reduced, but detection accuracy is reduced due to biasing issues
Solution Approach 1:
The patent extracts and eliminates the biasing component from the envelope detection process. By using the difference between sum and difference of sampled values, the method automatically removes DC offset and biasing effects, achieving accurate envelope detection without requiring separate biasing compensation circuits or complex bias management.
Solution Approach 2:
The patent converts the potential harm of DC offset and biasing into a benefit by using the symmetric sampling structure. The specific arrangement of sampling points and the computation method (difference of sums) transforms the presence of DC components into a canceling effect, where biasing issues naturally resolve themselves through the mathematical structure rather than requiring additional compensation circuitry.
Data Source
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AI summary
A method and an apparatus for detecting an envelope using a difference between sampling signals are provided. The method includes generating sampling sets based on sampling signals of a modulated signal, and determining a sampling set from the sampling sets. The method further includes determining an envelope component value associated with a sampling signal among sampling signals included in the determined sampling set, based on a difference between the sampling signals included in the determined sampling set, and a difference between sampling signals included in each of the sampling sets other than the determined sampling set. The method further includes detecting an envelope of the modulated signal based on the envelope component value.