Transmitting system, receiving system, and transmission system

The master-slave synchronization method addresses synchronization challenges in multi-device video transmission systems by synchronizing PTP clocks and counter values, achieving accurate and low-latency video signal transmission.

JP2025166728APending Publication Date: 2025-11-06NTT INNOVATIVE DEVICES CORP
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Patent Information

Application Number
JP2024070930
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-04-24
Publication Date
2025-11-06

AI Technical Summary

Technical Problem

Existing transmission systems face challenges in achieving high-precision synchronization between multiple transmitting and receiving devices, leading to output delays and video quality degradation when transmitting video signals that exceed the capacity of a single device.

Method used

A master-slave synchronization approach is implemented, where a master transmitting/receiving device sends a PTP clock and counter value to slave devices, ensuring synchronized PTP clocks and counter values across all devices, reducing output delay and maintaining video quality.

Benefits of technology

This method enables highly accurate synchronization and reduces output delay while maintaining video quality, even when multiple devices are used, by synchronizing PTP clocks and counter values between master and slave devices.

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Abstract

To reduce the output delay of video signals while achieving high-precision synchronization between a plurality of devices.SOLUTION: A transmitting system includes a master transmitting device 1A and a slave transmitting device 1B, and transmits a video signal using the master transmitting device 1A and the slave transmitting device 1B. The master transmitting device 1A includes a synchronization unit 12 that outputs a synchronization signal including a PTP clock generated based on a PTP packet and a PTP counter value to the slave transmitting device, and a conversion unit 11 that converts a video signal input to the master transmitting device into a packet and transmits the packet, using the PTP clock. The slave transmitting device 1B includes a synchronization unit 12 that, when the synchronization signal is received from the master transmitting device 1A, replaces its own PTP clock and PTP counter value with the PTP clock and PTP counter value of the synchronization signal, and a conversion unit 11 that converts a video signal input to the slave transmitting device 1B into a packet and transmits the packet, using its own PTP clock.SELECTED DRAWING: Figure 1
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