Slave device, time synchronization method in slave device, master device, and electronic equipment system

A master device and time technology, which is applied in time division multiplexing systems, components of TV systems, synchronization, etc., can solve the problem of not being able to synchronize at time, and achieve the effect of high-precision time synchronization.

Inactive Publication Date: 2010-08-18
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the time correction of the clock unit 221 is performed using the calculation result of the offset including such an error, the slave device 220 cannot synchronize the time with the master device 210 with high accuracy.

Method used

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  • Slave device, time synchronization method in slave device, master device, and electronic equipment system
  • Slave device, time synchronization method in slave device, master device, and electronic equipment system
  • Slave device, time synchronization method in slave device, master device, and electronic equipment system

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no. 2 Embodiment approach

[0077] 3. Modification

no. 1 Embodiment approach

[0079] [Structure Example of Electronic Equipment System]

[0080] figure 1 A configuration example of the electronic equipment system 100 as the first embodiment is shown. This electronic device system 100 is composed of a master device 110 and a slave device 120 . For example, when the electronic device system 100 is a camera system composed of a plurality of cameras, the master device 110 is a camera as a master device, and the slave device 120 is a camera as a slave device. Also, for example, when the electronic device system 100 is a control system composed of a control device (computer) and a plurality of controlled devices, the master device 110 is the control device and the slave device 120 is the controlled device.

[0081] In addition, in figure 1 In , for simplicity of description, the case where there is one slave device 120 is shown. In addition, in figure 1 In the figure, as the configuration of the master device 110 and the slave device 120, only the par...

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Abstract

Provided is a slave device, time synchronization method in the slave device, master device, and electronic equipment system. The time synchronization with the master device is performed in the slave device with high accuracy. The time correction is performed in two stages. In the first stage, The time (t1) is calculated by the subtraction from a second time (t2) receiving the message issued in the first time (t1) by the master device (110) to obtain a first correction value, the time St(x) is corrected into a value calculated by the subtraction from the first correction value. The corrected time St(x) is a value obtained by subtracting a transmission delay component (Delay) from the time Mt(x) of the master device, forms in a state ((a) to (e)) removing the offset component (offset). In the second stage, The time (t3) is calculated by the subtraction from a fourth time (t4) receiving the message issued in the third time (t3) by the master device, is further halved to obtain the second correction value, the time St(x)' is corrected into a value calculated by the addition with the second correction value. The corrected time St(x)'' is consistent to the time Mt(x) of the master device, thus the synchronization ((f) to (j)) is realized.

Description

technical field [0001] The present invention relates to a slave device, a time synchronization method of the slave device, a master device and an electronic equipment system, and particularly relates to a slave device and the like which realize time synchronization with the master device with high precision. Background technique [0002] In recent years, with the digitalization of media, most devices that digitally record video streams, represented by video cameras, have been commercialized. Also, with the digitization of video streams, the environment in which editing can be easily performed has widened. [0003] When editing video streams captured by multiple cameras to form a single video stream, refer to the timestamp of the video stream to match the shooting time of multiple streams, and construct by switching videos at the same time A method of recording video streams in which time is not reversed. [0004] Therefore, it is necessary to always align the built-in cloc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04N5/232G04G7/00G04C9/04G04G5/00
CPCH04N5/23203G04G7/02G04R40/06H04J3/0667H04N23/66
Inventor 猪俣直树
Owner SONY CORP
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