Digital Multimedia Link Encoding for Lossless Bandwidth Reduction
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Solution Overview
Problem
Existing digital multimedia transmission methods either lose data during compression or require high bandwidth, limiting efficient data transmission over long distances without error detection and correction.
Innovation Solution
A system that encodes control signals into control words only when they change, multiplexes these with payload data, and transmits them, allowing for lossless bandwidth reduction using an encoder, multiplexer, transmission system, demultiplexer, and decoder, while maintaining data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MPEG format compression is used to minimize bandwidth, then bandwidth is reduced, but data loss occurs and information cannot be recovered
Solution Approach 1:
The patent extracts only the essential control signal information from the payload data and transmits it separately as control words. By taking out only the necessary control information rather than transmitting the entire payload, the system reduces bandwidth usage while preserving the ability to recover complete data at the receiver through buffering and control-based reconstruction.
2Reliability
If control signals are transmitted continuously, then data integrity is maintained, but bandwidth is wasted during periods when control signals do not change
Solution Approach 1:
The patent implements periodic transmission of control words only when control signals change, rather than continuous transmission. The encoder monitors control signals and generates control words only at change points, creating a periodic transmission pattern that maintains data integrity while eliminating redundant transmissions during stable periods.
Solution Approach 2:
The patent changes the transmission parameter from continuous control signal transmission to event-driven control word transmission. By monitoring for changes in control signal state and only transmitting when parameters change, the system maintains reliability while significantly reducing average bandwidth consumption during stable operating conditions.
3Quantity of substance
If payload data is transmitted without control words during blanking periods, then bandwidth is saved, but synchronization and data recovery become difficult
Solution Approach 1:
The patent introduces control words as intermediary elements that mediate between the payload data and the receiver. These control words serve as synchronization markers that guide the receiver through the data stream, indicating when payload data is present and when blanking periods occur, thereby simplifying synchronization without requiring continuous control signal transmission.
Data Source
AI summary
A system for reducing the bandwidth of a data stream transmitted via a digital multimedia link does not result in the loss of data. The system encodes control signals such that control words are generated each time the status of the control signals change. The system multiplexes payload data and the control words to generate the data stream. If no blanking period of the payload data is present, the data stream comprises payload data. During the blanking period, the data stream comprises the control words. The data stream is transmitted across the digital multimedia link using transmit and receive FIFO memories. The transmitted data stream is then demultiplexed, and the payload data and the control words are separated from each other. The control words are decoded to recover the control signals. The system can transmit payload data conforming to the video formats VGA, SVGA, XGA, SXGA and UXGA.