Analog Electronic Timepiece Driving Noise Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional analog electronic timepieces face challenges in receiving accurate time codes due to driving noise interference during standard radio wave reception, particularly when the radio wave intensity is weak, leading to either stopped hand driving or frequent timing adjustments, which disrupt the user's ability to read time accurately.
Innovation Solution
An analog electronic timepiece with a receiver, demodulator, and a second synchronization determination unit that identifies and filters out driving noise from the time code signal, allowing continuous hand driving without frequent timing adjustments by using interrupt functions, noise judgment, and pulse width analysis to determine synchronous points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor for rotating hands is driven during standard radio wave reception, then the time display function is maintained, but driving noise mixes into the reception signal causing inaccurate time code reception
Solution Approach 1:
The patent extracts and removes the harmful driving noise from the reception signal through signal processing. The noise removal unit specifically targets and eliminates the motor driving noise component from the mixed signal, allowing accurate time code extraction even when the motor operates during reception.
Solution Approach 2:
The patent changes the parameter of signal processing by implementing frequency domain analysis and filtering. By transforming the signal to frequency domain and applying selective filtering based on the known motor noise frequency characteristics, the system separates the useful time code signal from the harmful motor noise.
2Reliability
If hand driving is stopped during radio wave reception, then accurate time code reception is achieved, but the user cannot check second and minute figures during that period
Solution Approach 1:
The patent maintains continuous hand driving during radio wave reception by eliminating the need to stop the motor. Through noise removal signal processing, the system achieves both continuous motor operation (maintaining time display) and accurate time code reception simultaneously.
3Reliability
If the driving timing of hands is staggered to avoid affecting radio wave reception, then reception interference is reduced, but the driving timing is frequently adjusted causing user discomfort and making it difficult to identify accurate time code
Solution Approach 1:
The patent removes the harmful effect of motor noise from the reception signal rather than avoiding motor operation through timing adjustments. This allows stable, continuous hand driving while achieving accurate reception through signal processing.
Solution Approach 2:
The patent uses feedback from frequency domain analysis to identify and remove motor noise components. By continuously monitoring the reception signal and applying adaptive filtering based on detected noise characteristics, the system maintains both stable motor operation and accurate reception.
Data Source
AI summary
An analog type electronic timepiece including a plurality of hands for displaying a time; a driving unit for electrically driving the hands; a receiver for receiving and demodulating a radio wave containing a time code signal; and a second synchronization determination unit for determining a second synchronous point of the time code signal demodulated by the receiver through identifying a driving noise mixed in the time code signal by action of the driving unit.