Composite Video Signal Modulation for Mixed Clock Frequencies
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Solution Overview
Problem
Existing digital video signal transmission protocols, such as BT656 and BT1120, cannot simultaneously transmit video signals with different clock frequencies, limiting the flexibility of video signal transmission.
Innovation Solution
A method and apparatus for compositing video signals by adjusting the byte size of multiple video signals to conform to a single-edge sampled data amount corresponding to a predetermined clock frequency, allowing for composite modulation and simultaneous transmission through an analog-to-digital conversion chip and system-on-chip (SOC) chip, using multiplier point modes to ensure data amounts match the working clock frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital video signal transmission protocols (BT656, BT1120) are used to transmit video signals, then data transmission in YCbCr format is achieved, but video signals with different clock frequencies cannot be transmitted simultaneously
Solution Approach 1:
The patent merges multiple video signals with different clock frequencies into a single composite video signal by interleaving their data streams. The compositing unit combines pixels from different video signals into alternating bytes, allowing multiple signals to share the same transmission interface simultaneously while maintaining their individual characteristics
Solution Approach 2:
The transmission interface is designed to handle multiple video signals with different clock frequencies through a universal compositing mechanism. The system can adaptively composite any number of video signals regardless of their individual clock frequencies, making the interface multi-functional and versatile
2Productivity
If byte size adjustment is performed on multiple video signals to conform to predetermined clock frequency, then simultaneous transmission is enabled, but data processing complexity increases
Solution Approach 1:
The compositing operation is performed in advance before transmission, adjusting the byte sizes and interleaving the data streams of multiple video signals. This preliminary compositing allows the transmission interface to operate at a fixed clock frequency without real-time adjustments during transmission
Solution Approach 2:
The compositing unit acts as an intermediary between the video signal sources and the transmission interface. It performs byte size adjustment and data interleaving, transforming multiple signals with different timing into a unified stream that conforms to the predetermined clock frequency of the transmission interface
Data Source
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AI summary
A method of compositing video signals includes: obtaining at least two video signals to be composited; determining a multiplier point mode corresponding to each of the at least two video signals; performing a byte size adjustment on the at least two video signals respectively according to the multiplier point mode corresponding to each of the at least two video signals; performing a composite modulation on bytes corresponding to the at least two video signals after the byte size adjustment, and outputting composite-modulated data through a target signal interface of an analog-to-digital conversion chip.