Frequency Processor Clock Adjustment for Stable Image Transmission
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Solution Overview
Problem
Existing image transmission devices face issues with maintaining a locked state between the image frame transmitter and receiver when frame rates change, leading to disconnection and impaired display due to sudden frequency changes in the reference clock signal, causing color jumping and affecting normal display.
Innovation Solution
An image transmission device with a frequency detector, configuration device, and processor that adjusts the reference clock signal frequency in safe step values to match the changed frame rate, ensuring the locked state is maintained by outputting a frequency switching mark signal and adjusting the reference clock signal until it matches the new frame rate, preventing sudden frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reference clock signal frequency is adjusted to match changed frame rates, then the image transmission adapts to different frame rates, but sudden frequency changes cause the locked state to be lost and display quality to deteriorate
Solution Approach 1:
The frequency adjustment process is segmented into multiple discrete steps rather than a single large change. The frequency processor adjusts the reference clock signal frequency in incremental steps, where each step is a predefined safe frequency step value. This segmentation prevents sudden frequency changes that would disrupt the locked state while still achieving the target frame rate adaptation.
Solution Approach 2:
The system dynamically adjusts the reference clock signal frequency based on the detected frame rate changes. When a frame rate change is detected, the frequency processor initiates a dynamic adjustment process that modifies the frequency in controlled steps. This dynamic adaptation allows the system to respond to changing frame rates while maintaining stability through controlled, incremental changes rather than abrupt transitions.
2Speed
If the frequency adjustment process uses large step values, then the adjustment speed increases, but the locked state is lost and color jumping occurs
Solution Approach 1:
The system changes the frequency adjustment parameter from a single large step to multiple smaller steps. Each frequency adjustment step is constrained to be less than or equal to a predefined safe frequency step value. This parameter change ensures that the frequency adjustment is fast enough to respond to frame rate changes but slow enough to maintain the locked state and prevent color jumping during the transition.
Data Source
AI summary
An image transmission device includes: a frequency detector configured to detect a frame rate of an image frame and output a frequency switching mark signal when detecting that the frame rate changes; a frequency configuration device configured to output a first configuration signal according to a safe frequency step value in response to the frequency switching mark signal; a frequency processor configured to output a reference clock signal, adjust a frequency of the output reference clock signal repeatedly according to the first configuration signal, and until a frequency of an adjusted reference clock signal is substantially equal to a frequency of a reference clock signal corresponding to a changed frame rate, end adjustment; and an image frame transmitter configured to convert a format of the image frame into a format corresponding to the image frame transmitter according to the adjusted reference clock signal, and output the format-converted image frame.