Endoscope Sync Signal Reset With High-Speed Clock Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In endoscope systems with downsized imagers lacking synchronization signal transmission and reception functionality, synchronization signal generation units generate synchronization signals based on voltage level changes, leading to potential synchronization deviations due to disturbances, which can result in delayed and inadequate image display.
Innovation Solution
A signal processing device with a reset circuit that synchronizes first and second synchronization signals by resetting the first synchronization signal generation circuit when desynchronization occurs, and adjusts clock signal frequency to higher levels during the reset period, using a phase-locked loop and selector circuit to ensure timely image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the imager is downsized by removing synchronization signal transmission and reception functionality, then the insertion unit diameter is reduced, but synchronization deviations occur due to disturbances in the generated synchronization signals
Solution Approach 1:
The system continuously monitors the synchronization between the first synchronization signal (from the downsize imager) and the second synchronization signal (from the processor). When desynchronization is detected, a reset signal is automatically generated to realign the synchronization signals, ensuring continuous reliable operation despite the removed synchronization functionality.
Solution Approach 2:
The imager generates its own synchronization signal internally based on voltage level changes in the image signal, eliminating the need for external synchronization signal transmission and reception. This self-generated synchronization signal enables the imager to operate independently while maintaining synchronization with the processor through automatic reset mechanisms.
2Reliability
If the first synchronization signal generation circuit is reset to correct synchronization deviations, then synchronization accuracy is improved, but image display is delayed due to the reset process
Solution Approach 1:
The clock signal frequency is increased in advance before the reset operation is performed. This preliminary frequency increase prepares the system to complete the reset process more quickly, minimizing the interruption to image display while ensuring synchronization accuracy is restored.
Solution Approach 2:
The clock signal frequency is dynamically adjusted based on the synchronization state. When desynchronization is detected and reset is initiated, the frequency is temporarily increased to accelerate the reset process. Once synchronization is restored, the frequency returns to its normal operating level, optimizing both speed and power consumption.
3Loss of time
If the clock signal frequency is increased during the reset period, then the reset process is accelerated and image display delay is reduced, but power consumption increases
Solution Approach 1:
The high-frequency clock signal operation is applied periodically only during the brief reset period when desynchronization is detected. For the majority of operation time, the system uses the normal lower clock frequency, thereby minimizing overall power consumption while still achieving rapid reset when needed.
Solution Approach 2:
The clock frequency is increased in advance before the reset operation begins, allowing the reset process to complete more quickly. This preliminary frequency increase limits the duration of high power consumption to the minimum necessary time, reducing the overall energy impact of the reset operation.
Data Source
AI summary
A signal processing device includes a processor including at least one or more pieces of hardware. The processor is configured to: when a first synchronization signal from a first synchronization signal generation circuit, the first synchronization signal generation circuit receiving a first clock signal and outputting the first synchronization signal, and a second synchronization signal output from a second synchronization signal generation circuit are not synchronized, reset the first synchronization signal generation circuit, and in a period in which the first synchronization signal generation circuit is reset, set a frequency of the first clock signal to be higher than a frequency in another period.