04807257 is referenced by 7 patents and cites 6 patents.

A sampled synchronous transmission signal Vt is represented by a series of samples J at equidistant sampling instants. A computing circuit 5 computes the positions R of the sampling instants relative to the rising edges of a virtual reference clock Cref which is phase-locked to the channel clock. For each sampling instant the position R is determined on the basis of the position R of a preceding sampling instant and a measure Q of the difference in time between the sampling interval T and the period L of the virtual reference clock Cref. From the values of the successive samples J an interpolation circuit 2 derives the positions N of the detection-level crossings by the transmission signal Vt, which crossings represent a fixed phase position of the channel clock. After each detection-level crossing the measure Q of the time difference is corrected by circuit 3 and 4, depending on the difference between the positions N and R. A data recovery circuit arrangement recovers the data depending on the values determined for the positions R.

Title
Apparatus for the regeneration of channel-clock information in synchronous data transmission and data-recovery circuit arrangement comprising such apparatus
Application Number
6/895966
Publication Number
4807257
Application Date
August 12, 1986
Publication Date
February 21, 1989
Inventor
Josephus A H M Kahlman
Eindhoven
NL
Kornelis A Schouhamer Immink
Eindhoven
NL
Agent
Anne E Barschall
Jack E Haken
Thomas A Briody
Assignee
U S Philips Corporation
NY, US
IPC
H04L 7/00
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