Video Signal Reception Using Pulse-Width Packet Byte Detection
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Solution Overview
Problem
Conventional video signal transmission systems cannot support changes in the number of gradation bits of a video signal, leading to an increase in the number of signal lines required, as the number of bytes per pixel packet may vary.
Innovation Solution
A video signal transmission system and device that serially packetize signals, using a deserializer to regenerate encoded packet signals, a decode unit to generate a control signal with varying pulse widths for different encoding processes, and an unpacker to determine the number of bytes per packet based on pulse width, allowing for flexible support of changing gradation bits and reducing the number of signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a signal line is used for each signal between the video signal transmission device and video signal reception device, then the video signal can be transmitted reliably, but the number of physical signal lines increases
Solution Approach 1:
The patent combines multiple signals (video signal, sync signal, data-enable signal) into a single serial packet signal for transmission. The transmission device multiplexes these signals into packets that are sent over one shared signal line, while the reception device demultiplexes them back into separate signals, thereby reducing the number of physical signal lines required while maintaining reliable transmission of all video signal components
2Device complexity
If the number of bytes of a packet for each pixel is fixed, then the signal transmission is simplified, but the system cannot support changes in the number of gradation bits of the video signal
Solution Approach 1:
The patent implements a dynamic packet structure where the number of bytes per packet can be adjusted based on the required number of gradation bits. The transmission device can vary the packet size to accommodate different video signal formats (e.g., 8-bit, 10-bit, 12-bit color depth), and the reception device adapts its processing accordingly, enabling the system to support multiple gradation bit configurations without requiring a completely different transmission architecture
Solution Approach 2:
The system changes the parameter of packet byte count dynamically based on the video signal requirements. When the number of gradation bits changes, the packet structure is modified to include the appropriate number of bytes per pixel, allowing flexible adaptation to different video formats while maintaining a consistent transmission framework
Data Source
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AI summary
A video signal reception device 20 for receiving a serial packet signal has a deserializer 21 which regenerates a plurality of encoded packet signals by serial-parallel converting said serial packet signal; a decode unit 25 which regenerates a plurality of packet signals by decoding said plurality of encoded packet signals from said deserializer 21; and an unpacker 24, 24A which regenerates a video signal, a sync signal and a data-enable signal by unpacketizing said plurality of packet signals from said decode unit 25, said decode unit 25 regenerating a control signal including a pulse with a pulse width corresponding to a period of a portion of said plurality of encoded packet signals, which is a portion on which an encode process that is different from a process for the other portion has been performed, and said unpacker 24, 24A determining the number of bytes of a packet based on the pulse width of said pulse in said control signal from said decode unit and unpacketizes said plurality of packet signals according to the number of bytes of said packet.