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Patent Searching and Data


Title:
UNIQUE WORD DETECTING METHOD
Document Type and Number:
Japanese Patent JPH07240733
Kind Code:
A
Abstract:

PURPOSE: To shorten TDM frame synchroizing establishing time by constituting a UW correlation device by moving and cycling the leading or final symbol of a UW for the UW sequence in a TDM signal symbol by symbol and detecting the TDM signal flaming time of the UW cyclic sequence.

CONSTITUTION: A cyclic type UW correlation device is composed of total 2N multipliers corresponding to each of hard decision symbols 0(3) and 1(4), 2N of the output lines (5-1-0/1 to 5-N-0/1), (N-1) KTS symbol delay circuits 2-1 to 2-(N-1) and N lines 6-1 to 6-N corresponding to the column in a UW sequence cycled symbol by symbol. The correlation with total N kinds of U series 8-1 to 8-N obtained by shifting the UW sequence by one symbol each is determined, the maximum value of the outputs of the correlation device exceeding a stipulated threshold value is detected by a detector 9, flaming timing information 10 is derived, and the flame synchronizing establishment of a TDM signal can be performed in short time by using the information.


Inventors:
ISHIKAWA HIROYASU
KOBAYASHI HIDEO
Application Number:
JP1994000052530
Publication Date:
September 12, 1995
Filing Date:
February 28, 1994
Export Citation:
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Assignee:
KOKUSAI DENSHIN DENWA CO LTD
International Classes:
G06F7/02; H04B7/15; H04J3/06; H04L7/04; H04L7/08; H04Q7/38; (IPC1-7): H04J3/06; H04B7/15; H04Q7/38; H04L7/08
Attorney, Agent or Firm:
山本 恵一