Interferer Removal for Analog Video Transmission
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Solution Overview
Problem
Analog video transmission in applications like automotive infotainment and surveillance systems is affected by periodic interference signals, which degrade the quality of the video signal during transmission, leading to compromised output.
Innovation Solution
A video receiver system with an interferer identification circuit and an interferer removal circuit that adjusts the phase of identified interference signals to match the periodic noise signal in the horizontal blanking interval and subtracts it from active pixel values, reducing the impact of periodic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If analog video transmission is used, then cost and simplicity are reduced, but periodic interference signals degrade video quality
Solution Approach 1:
The patent identifies periodic interference signals in blanking intervals and converts this harmful effect into a beneficial one by using the interference signal itself as a reference to generate a cancellation signal. The interferer identification circuit extracts the periodic interference from blanking intervals, and the interferer removal circuit uses this extracted signal to create an opposing signal that cancels the interference in active video lines, thereby converting the harmful interference into a useful reference for elimination.
Solution Approach 2:
The patent segments the video signal processing into distinct functional parts: blanking interval processing and active line processing. The interferer identification circuit processes only the blanking intervals to identify interference patterns, while the interferer removal circuit applies the identified interference cancellation to active video lines. This segmentation allows the system to handle interference removal efficiently without processing the entire video signal uniformly.
2Object-affected harmful factors
If digital transmission is used, then interference resistance is improved, but cost and complexity increase
Solution Approach 1:
The patent introduces an intermediary processing stage between the analog transmission channel and the video output. The interferer identification circuit and interferer removal circuit act as mediators that process the transmitted signal to eliminate periodic interference. This intermediary approach maintains the simplicity of analog transmission while adding targeted interference removal capability, avoiding the need for complete digital conversion and associated complexity.
3Manufacturing precision
If interferer removal processing is applied, then video quality is improved, but processing complexity increases
Solution Approach 1:
The patent applies interferer removal processing selectively rather than uniformly to all video data. The interferer identification circuit operates only on blanking intervals, and the interferer removal circuit applies cancellation signals only to active video lines. This partial action approach reduces processing complexity compared to applying full-spectrum interference removal to the entire video signal, while still achieving effective interference elimination where needed.
Data Source
AI summary
Video systems with video receivers for receiving video signals transmitted in analog format over a video link are described. An example video receiver includes an interferer identification circuit and an interferer removal circuit. The interferer identification circuit is configured to identify a periodic interference signal (e.g., from one or more of vertical blanking intervals (VBIs)) of a received video signal. The interferer removal circuit is configured to generate a filtered video signal, where generation of the filtered video signal includes, for each line of a given frame of the received video signal, generating an adjusted interference signal by adjusting a phase of the identified interference signal to match a phase of a periodic noise signal in at least a portion of a horizontal blanking interval (HBI) associated with the line, and subtracting the adjusted interference signal from a plurality of active pixel values of the line.