Video Sync Separation Using PRE_BE Timing Against Noise
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Solution Overview
Problem
Existing transmitting and receiving systems are susceptible to external noise interference, leading to inaccurate separation of active and sync data, which can cause severe distortion in displayed images.
Innovation Solution
The system includes a transmitting device that transmits additional PRE_BE data N1 cycles before BE data and a receiving device that detects and reproduces BS and BE data using prediction cycles based on a reference clock, enhancing noise resistance by ensuring accurate separation of active and sync data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving device uses traditional detection methods for BS data and BE data, then the device complexity is low, but the reliability of data separation deteriorates due to noise interference
Solution Approach 1:
The patent applies preliminary action by transmitting PRE_BE data N1 cycles before the actual BE data. This advance notification allows the receiving device to prepare for the upcoming BE data transmission, enabling more robust noise filtering and prediction mechanisms. The receiving device can use the PRE_BE data as a reference point to predict the timing and characteristics of the forthcoming BE data, thereby improving detection reliability in noisy environments without requiring overly complex real-time processing.
2Reliability
If the receiving device transmits additional PRE_BE data and uses prediction cycles, then the external noise resistance is improved, but the loss of time increases due to additional data transmission and processing cycles
Solution Approach 1:
The PRE_BE data is transmitted in advance during the blanking period, which is idle time in the video signal transmission. This preliminary action does not extend the active video display time but utilizes the existing blanking period efficiently. The receiving device processes this advance information to predict BE data timing, reducing the need for complex real-time noise filtering during critical active data periods.
Solution Approach 2:
The patent employs periodic action by establishing fixed N1 and N2 cycle intervals for PRE_BE and BS data transmission. These regular periodic patterns allow the receiving device to use simple timing-based prediction rather than complex continuous analysis, significantly reducing processing time while maintaining noise resistance. The periodic structure creates predictable intervals that can be handled with efficient algorithms.
3Measurement precision
If the receiving device detects BS data and BE data accurately, then the manufacturing precision of video display is high, but the object-affected harmful factors increase due to susceptibility to external noise
Solution Approach 1:
By transmitting PRE_BE data in advance, the system provides the receiving device with early warning information about upcoming BE data. This allows the receiver to activate enhanced detection and noise filtering mechanisms in advance, rather than attempting to filter noise in real-time during critical detection moments. The preliminary information serves as a reference for predicting the exact timing and expected characteristics of the BE data.
Solution Approach 2:
The patent implements feedback by using detected PRE_BE data to predict and guide the detection of subsequent BE data. The receiving device uses the timing and characteristics of PRE_BE data as feedback to adjust its detection parameters for the upcoming BE data, creating a closed-loop system that continuously adapts to maintain precision despite noise interference.
Data Source
AI summary
Video data including active data and sync data is transmitted from a transmitting device to a receiving device. In a blanking period for transmitting the sync data, BS data is transmitted at the first cycle of the blanking period, BE data is transmitted at the last cycle of the blanking period, and PRE_BE data is transmitted N1 cycles before the BE transmission cycle. The receiving device reproduces the BE data based on the detected PRE_BE data or BE data, and reproduces the BS data based on the reproduced BE data or the detected BS data. Because external noise resistance is further strengthened, the active data and the sync data can be accurately separated from among the received data.