Wave Clock Time Reception Circuit Noise Rejection
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Solution Overview
Problem
Existing time reception apparatuses face challenges in accurately detecting time information due to noise interference in reception signals, leading to false detection and impaired reception performance.
Innovation Solution
A wave clock system with a reception circuit unit that includes a tuning switching circuit, AGC amplifier, filter circuit, post amplifier, detection rectifier circuit, and waveform shaping circuit, which adjusts the threshold level based on the standard frequency broadcast classification to enhance noise rejection and improve decoding accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sampling and smoothing techniques are used to detect time information, then false detection due to noise is reduced, but detection capability deteriorates when reception state is bad and noise levels are high
Solution Approach 1:
The patent changes the detection parameter from fixed threshold comparison to variable threshold that adapts to signal conditions. The threshold is dynamically adjusted based on the received signal characteristics, allowing the system to maintain detection accuracy across varying noise levels and reception conditions.
Solution Approach 2:
The patent introduces dynamic adaptation in the detection process. Instead of using static sampling and smoothing parameters, the system continuously adjusts its detection parameters based on real-time signal quality assessment, enabling it to respond to changing reception conditions and maintain reliable time information detection.
2Device complexity
If fixed threshold judgment is used for decoding time information, then processing is simple, but detection accuracy decreases when noise components are included
Solution Approach 1:
The patent transforms the fixed threshold parameter into a variable parameter that changes based on signal conditions. The threshold is no longer a constant value but adapts dynamically to the received signal characteristics, improving decoding accuracy without significantly increasing system complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the detection threshold is continuously adjusted based on the observed signal quality and detection results. This feedback loop allows the system to learn from past detections and optimize its threshold settings for current reception conditions, improving accuracy while maintaining reasonable processing complexity.
Data Source
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AI summary
Code data indicated by a time code signal is judged according to the kind of the received standard frequency broadcast at the time of decoding the time code signal. For example, in the case of receiving a JJY standard frequency broadcast, the time code signal falls at time points t21 and t23 in a second period T2, and the code data indicated by the time code signal in the second period T2 is judged based on the time point t23 at which the time code signal falls last between the time points t21 and t23. Thereby, even if a lot of noise components are included in a reception signal, the pertinently detection of the time information is enabled.