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Patent Searching and Data


Title:
FREQUENCY DIFFERENCE DETECTION DEVICE, FREQUENCY DIFFERENCE DETECTION METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2013/051445
Kind Code:
A1
Abstract:
The disclosure relates to: a frequency difference detection device capable of synchronizing oscillation frequencies with a master device on a network, with high precision; a frequency difference detection method; and a program. This frequency difference detection device detects oscillation frequency errors of a master device and a slave device connected via a network, and comprises: a first subtraction unit that calculates the difference between a transmission time (T1) included in a sync message periodically transmitted from the master device and a reception time (T2) for when the message is received; a second subtraction unit that calculates the difference between subtraction results (T2i - T1i) from the first subtraction unit corresponding to the sync message received on the ith time and the subtraction results (T2i-k - T1i-k) from the first subtraction unit corresponding to the sync message received on the i-kth time; and a first division unit that divides the subtraction results of the second subtraction unit by k. This disclosure can be applied, for example, to a PTP slave.

Inventors:
SOMEYA IKUO (JP)
HAMAMATSU TOSHIHIKO (JP)
KOJIMA TOSHIAKI (JP)
Application Number:
PCT/JP2012/074832
Publication Date:
April 11, 2013
Filing Date:
September 27, 2012
Export Citation:
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Assignee:
SONY CORP (JP)
International Classes:
H04L7/00; G04G3/00; G04G3/02
Foreign References:
JP2004186877A2004-07-02
JP2005341203A2005-12-08
JP2010101793A2010-05-06
JP2010190635A2010-09-02
Attorney, Agent or Firm:
INAMOTO Yoshio et al. (JP)
Yoshio Inemoto (JP)
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Claims: