Digital Video Signal Transmission Equalization via VBI Reference
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Solution Overview
Problem
Existing methods for transmitting digital video signals over long distances suffer from channel loss and inefficient use of vertical blanking interval (VBI) for equalization reference signals and control data, leading to reduced data transmission capacity.
Innovation Solution
A method that uses a single-tone equalization reference signal and control data sequence, combined with digital video signals in the digital domain, and transmitted during the VBI, allowing for simplified equalization and increased data capacity by reducing unnecessary overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex equalization reference signal patterns are transmitted during VBI, then channel equalization can be achieved, but the utilization of VBI is reduced and device complexity increases
Solution Approach 1:
The patent extracts only the essential equalization information from complex reference signal patterns and transmits it through a simplified single-tone signal during VBI. This removes unnecessary complexity while retaining the core equalization function, directly resolving the contradiction between achieving equalization and reducing device complexity.
Solution Approach 2:
The patent changes the parameter of the equalization reference signal from complex multi-frequency patterns to a simple single-tone signal. This parameter simplification reduces the complexity of the equalization process while maintaining effectiveness, addressing both the reliability and device complexity concerns.
2Reliability
If each data bit is encapsulated by beginning and end signals during VBI transmission, then data integrity is ensured, but the available transmission time is significantly reduced
Solution Approach 1:
The patent removes the redundant beginning and end signal encapsulation from each data bit transmission during VBI. By extracting only the essential data bits without unnecessary overhead, the system maintains data integrity while significantly increasing the available transmission time within the fixed VBI window.
3Measurement precision
If multiple equalization reference signals are transmitted during VBI, then comprehensive channel characterization is achieved, but the data transmission capacity is reduced
Solution Approach 1:
The patent makes the single-tone equalization reference signal transmitted during VBI serve multiple functions: it characterizes the channel response, enables equalization, and allows for data transmission. This multi-functionality achieves comprehensive channel characterization without sacrificing data transmission capacity, as the same signal structure serves both purposes efficiently.
Data Source
AI summary
A method and an apparatus for improving digital video signal transmission over a long transmission line are disclosed. A simple equalization reference signal is generated and then combined with a digital video signal in the digital domain such that the transmission of the reference signal takes place at a predefined time period during the vertical blanking interval of the video signal. The combined signal is then converted into an analog video transport signal, which analog signal is then transmitted over the long transmission line to a downstream video receiver. The equalization reference signal is extracted and used at the video receiver to restore the analog video signal which in turn is converted back to digital video signal.