US 11,122,310 B2Granted

Video switching system

AssigneeMedia Links Co., Ltd.

InventorsKazunori Nakamura, Kazuki Narita

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Abstract

The video switching system includes a PTP grand master, a first and second transmitters configured to synchronize a time with the PTP grand master according to PTP, and a receiver connected to the first transmitter and the second transmitter over an IP-network. The first and second transmitter respectively receive video signals distributed from one video signal, divide the video signals into a plurality of IP-packets and set timestamps to the plurality of IP-packets, the timestamps based on the synchronized time according to PTP. The first transmitter sends the plurality of IP-packets set the timestamps as a first IP-packet stream via a first transmission path according to RTP. The second transmitter sends the plurality of IP-packets set the timestamps as a second IP-packet stream via a second transmission path according to RTP.

Claims7

Dependent claims

A video switching system comprising:

a first transmitter configured to synchronize a time with a Precision Time Protocol (PTP) grand master according to PTP;
a second transmitter configured to, independently from the synchronization by the first transmitter, synchronize a time with the PTP grand master according to PTP;
and
a receiver connected to the first transmitter and the second transmitter over an IP-network,
wherein the first transmitter and the second transmitter respectively:
receive video signals distributed from one video signal;
divide the video signals into a plurality of IP-packets;
and
set timestamps to the plurality of IP-packets, the timestamps based on the synchronized time according to PTP,
the first transmitter sends the plurality of IP-packets set with the timestamps as a first IP-packet stream via a first transmission path according to Real-time Transport Protocol (RTP), the second transmitter sends the plurality of IP-packets set with the timestamps as a second IP-packet stream via a second transmission path according to RTP,
the receiver is further configured to:
compare the timestamps set in the IP-packets between the first IP-packet stream and the second IP-packet stream to calculate a difference between the timestamps;
identify a pair of IP-packets including same payloads in the first IP-packet stream and the second IP-packet stream in response to determining that the difference is within a predetermined range;
if receiving the pair of IP-packets, select one of the pair of IP-packets to reconstruct video signals;
and
if receiving one IP-packet of the pair of IP-packets only, use the one IP-packet to reconstruct the video signals.

13 more elements

A video switching system comprising:

a first transmitter configured to:
receive video signals distributed from one video signal;
divide the video signals into a plurality of IP-packets;
set the Real-time Transport Protocol (RTP) sequence numbers to the plurality of IP-packets;
and
send the plurality of IP-packets as a first IP-packet stream via a first transmission path;
a second transmitter configured to:
receive the distributed video signals;
divide the video signals into a plurality of IP-packets;
set the RTP sequence numbers to the plurality of IP-packets independently from the RTP sequence numbers set by the first transmitter;
and
send the plurality of IP-packets as a second IP-packet stream via a second transmission path according to RTP;
a receiver connected to the first transmitter and the second transmitter over an IP network, the receiver configured to:
determine a first IP-packet indicating a video frame boundary in the first IP-packet stream;
determine a second IP-packet indicating a video frame boundary in the second IP-packet stream;
calculate a first delta value by subtracting a sequence number in the first IP-packet from a sequence number in any IP-packet in the first IP-packet stream;
calculate a second delta value by subtracting a sequence number in the second IP-packet from a sequence number in any IP-packet in the second IP-packet stream;
identify a pair of IP-packets including same payloads in the first IP-packet stream and the second IP-packet stream in response to that the first delta value and the second delta value match;
if receiving the pair of IP-packets, select one of the pair of IP-packets to reconstruct video signals;
and
if receiving one IP-packet of the pair of IP-packets only, use the one IP-packet to reconstruct the video signals.

18 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/645,890Filed 14 Sep 2017
Published: US 2020/0280749 A13 Sep 2020
Granted: 14 Sep 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H04N 21/242
Processing of content or additional data; Elementary server operations; Server middleware: synchronisation processes, e.g. processing of PCR…
H04L 1/08
Arrangements for detecting or preventing errors in the information received: by repeating transmission, e.g. Verdan system
H04L 1/22
Arrangements for detecting or preventing errors in the information received: using redundant apparatus to increase reliability
H04L 43/106
Active monitoring, e.g. heartbeat, ping or trace-route: using time related information in packets, e.g. by adding timestamps

Family

US 2020/0280749 A1Pre-grant publication · published 3 Sep 2020
US 11,122,310 B2This patent

From the US filing history. Foreign family members aren’t listed.

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