SDI Signal Processing Device for Frame Synchronization
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Solution Overview
Problem
Current signal processing devices for audio-video signals face issues with signal delays due to varying wire qualities and lengths, leading to misaligned displays, as they rely on adjacent frame synchronization mechanisms which are inadequate for handling excessive delays between lines.
Innovation Solution
A signal processing device comprising channel receivers, time code processors, a timing generator, a signal processor, and a transmitter that extracts and converts time codes from SDI protocol-formatted audio-video signals into frame time codes for absolute frame synchronization, ensuring synchronized transmission across multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If adjacent frame synchronization mechanism is used, then signal transmission speed is maintained, but display alignment deteriorates due to excessive delay between lines
Solution Approach 1:
The patent introduces time code data as an intermediary element that carries timing information between multiple signal lines. This time code acts as a mediator that enables synchronization by providing a reference that can be used to align frames across different channels, resolving the alignment issue without compromising transmission speed
Solution Approach 2:
The patent changes the synchronization parameter from relative frame timing to absolute time code-based timing. By extracting and utilizing time code information that represents absolute time references, the system can synchronize multiple channels based on precise temporal parameters rather than relying on adjacent frame relationships, thereby maintaining both speed and alignment precision
2Productivity
If multiple channels transmit audio-video signals simultaneously, then transmission efficiency is improved, but synchronization accuracy deteriorates due to varying wire qualities and lengths
Solution Approach 1:
The time code serves as a common intermediary reference that all channels can use to synchronize their transmission. Each channel independently extracts and uses the time code information to align its signal, ensuring that despite different wire characteristics, all channels maintain accurate synchronization with high transmission efficiency
Solution Approach 2:
The patent segments the synchronization function into separate time code extraction and processing stages. By isolating the time code information from the main video signal and processing it separately through dedicated time code processors, the system achieves precise synchronization for each channel while maintaining overall transmission efficiency
Data Source
AI summary
A signal processing device is disclosed, which includes a plurality of channel receivers, a plurality of time code processors in one-to-one correspondence with the channel receivers, a timing generator, a signal processor and a transmitter, wherein each channel receiver is configured to parse an audio-video signal which has a data format defined by the SDI protocol and including a time code that characterizes time information. Each time code processor is configured to extract the time code from a parsed audio-video signal obtained by a corresponding channel receiver, and form first frame image data including a frame time code. The signal processor is configured to form an absolute frame output image based on multiple channels of the first frame of image data, frame time codes therein, and an internal clock signal generated by the timing generator. The transmitter is configured to transmit the absolute frame output image for display.