Video Signal Transmission Device Using Packetized Serial Encoding
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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 physical signal lines required.
Innovation Solution
A video signal transmission device that packetizes and encodes signals based on the number of gradation bits, using a serializer to convert signals serially and a deserializer to convert them back parallelly, allowing the video signal reception device to determine the number of bytes per packet from the pulse width of the control signal, thereby supporting changes in gradation bits without increasing 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 transmission line using time-division multiplexing. The packer packetizes these signals and the serializer converts them to a serial stream that can be transmitted over one physical line, thereby reducing the number of signal lines while maintaining reliable transmission through structured packet formatting and synchronization mechanisms.
Solution Approach 2:
The patent segments the video signal into packets with specific structures including sync packets and data packets. Each packet is further divided into bytes that can be transmitted sequentially. This segmentation allows the signals to be reassembled at the reception device, enabling reliable transmission over a single line while supporting variable gradation bits through flexible packet formatting.
2Device complexity
If the number of bytes of a packet for each pixel is fixed, then the transmission system is simple, but the system cannot support changes in the number of gradation bits of the video signal
Solution Approach 1:
The patent implements dynamic packet structure where the number of bytes per packet can be adjusted based on the gradation bits required. The packer determines the packet byte count based on the video signal characteristics, and the transmission device and reception device synchronize their understanding of the packet structure through control signals. This dynamic adaptation allows support for different gradation bits (e.g., 8-bit, 10-bit, 12-bit) without increasing system complexity.
Solution Approach 2:
The patent changes the parameter of packet byte count based on the required gradation bits. When higher gradation bits are needed, the system increases the number of bytes per packet to accommodate the additional data. The control signal transmitted from the transmission device to the reception device carries information about the packet structure, allowing the reception device to adjust its decoding parameters accordingly, thus supporting variable gradation bits while maintaining system simplicity.
3Adaptability or versatility
If the video signal is packetized with variable bytes per packet based on gradation bits, then the system can support changes in gradation bits, but the encode process becomes more complex
Solution Approach 1:
The packer performs preliminary actions by determining the appropriate packet byte count before encoding, based on the gradation bits required. The control signal is prepared in advance with the correct packet structure information. This preliminary determination simplifies the subsequent encode process, as the encoder can work with predetermined packet structures rather than dynamically adjusting during encoding, thus managing complexity while supporting variable gradation bits.
Solution Approach 2:
The control signal acts as an intermediary that carries packet structure information from the transmission device to the reception device. This intermediary contains the necessary information about the number of bytes per packet, allowing the reception device to correctly interpret and decode the variable-length packets without requiring complex real-time analysis, thus managing encode complexity while enabling gradation bit flexibility.
Data Source
AI summary
A video transmission device 10 has: a packer 11 which receives a video signal, a sync signal, and a data-enable signal, and generates a plurality of packet signals by packetizing the video signal and the sync signal based on the data-enable signal and according to the number of bytes of a packet corresponding to the number of gradation bits of the video signal; an encode unit 15 which generates a plurality of encoded packet signals by encoding the plurality of packet signals; and a serializer 14 which generates a serial packet signal by parallel-serial converting the plurality of encoded packet signals. The packer 11 generates a control signal including a pulse with a pulse width corresponding to the number of bytes of the packet, and the encode unit 15 subjects a portion of the packet signals corresponding to the pulse in the control signal from the packer, to an encode process which is different from a process for the other portion.