Media Transmission Network Synchronization via PTP
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Solution Overview
Problem
Managing efficient usage of complex communication networks in large broadcasting facilities to provide high throughput of video signals is challenging, requiring systems and methods to allow devices to transmit, receive, and process video signals effectively.
Innovation Solution
A media transmission network with a controller and video processing devices synchronized using Precision Time Protocol (PTP), where control signals are transmitted out-of-band or in-band to ensure timely processing of video signals, reducing buffer requirements and hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If control signals are transmitted in-band with video signals, then bandwidth utilization is improved, but timing synchronization becomes more difficult
Solution Approach 1:
The patent segments control signals and video signals into separate logical channels while transmitting them over the same physical network infrastructure. Control signals are placed in dedicated packets with specific timing requirements, while video signals occupy other bandwidth resources. This segmentation allows independent timing management for control signals while maintaining high overall bandwidth utilization.
Solution Approach 2:
The patent introduces PTP (Precision Time Protocol) as an intermediary mechanism that operates over the same network infrastructure to provide precise timing synchronization. The PTP protocol inserts timing markers and synchronization information into the data stream, enabling devices to synchronize their processing of both control and video signals without requiring separate physical connections.
2Reliability
If large buffers are used to accommodate network delays, then timing synchronization is improved, but hardware complexity and cost increase
Solution Approach 1:
The patent implements preliminary timing adjustment by calculating expected network delays and pre-synchronizing control signals before transmission. The system determines the timing characteristics of the network in advance and uses this information to proactively adjust signal transmission times, eliminating the need for large buffering capacity to compensate for timing variations.
Solution Approach 2:
The patent dynamically adjusts timing parameters such as transmission intervals, buffer sizes, and synchronization offsets based on real-time network conditions. By changing these parameters adaptively rather than using fixed large buffers, the system achieves reliable synchronization with minimal hardware resources.
3Productivity
If control signals are transmitted ahead of video signals, then processing timing is improved, but network delay variation increases
Solution Approach 1:
The patent implements feedback mechanisms where receiving devices monitor the actual arrival times of control and video signals and report timing deviations back to transmitting devices. This feedback loop enables dynamic adjustment of transmission timing to maintain optimal processing synchronization despite varying network conditions, allowing control signals to be transmitted ahead without causing excessive timing variation.
Data Source
AI summary
Various embodiments are described herein for systems and methods that can be used to operate a media transmission network. In at least one embodiment, the media transmission network comprises a plurality of media processing devices configured to receive and process media streams based on control data. The media transmission network also comprises a controller coupled to the plurality of media processing devices and configured to generate a control signal for some or all of the media processing devices in the network. The controller is configured to determine the timing at which to transmit the control signal to a respective media processing device in order for the instructions in the control signal to be executed at the same time as the media data is received. The controller determines the transmission timing of each control signal by determining the latencies and delays of the network and the devices, such as, for example, network latency, processing delay, and/or control delay.