JPS568916A - Unique word detecting circuit - Google Patents

Unique word detecting circuit

Info

Publication number
JPS568916A
JPS568916A JP8465179A JP8465179A JPS568916A JP S568916 A JPS568916 A JP S568916A JP 8465179 A JP8465179 A JP 8465179A JP 8465179 A JP8465179 A JP 8465179A JP S568916 A JPS568916 A JP S568916A
Authority
JP
Japan
Prior art keywords
pulse
aperture
unique word
detection pulse
aperture signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8465179A
Other languages
Japanese (ja)
Inventor
Yukio Miyazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP8465179A priority Critical patent/JPS568916A/en
Publication of JPS568916A publication Critical patent/JPS568916A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/212—Time-division multiple access [TDMA]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

PURPOSE:To control the generation of an aperture signal by regarding the 1st detection pulse as that for a real unique word by stopping the preceding aperture signal by the 1st detection pulse. CONSTITUTION:Unique word detector 11 detects a unique word from received data and applies detection pulse (b) to AND circuit 12 and under AND conditions as to aperture signal (a) from aperture generator 14, start pulse (c) is applied to one- frame delay circuit 13. When aperture generator 14 outputs aperture signal (a) with trigger pulse (d) from delay circuit 13, the 1st detection pulse (b) is obtained and the outputting of start pulse (c) from AND circuit 12 stops aperture signal (a) of aperture generator 14 with its start pulse (c). Therefore, even if detection pulse (b) is obtained in the following period T, start pulse (c) is never generated.
JP8465179A 1979-07-04 1979-07-04 Unique word detecting circuit Pending JPS568916A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8465179A JPS568916A (en) 1979-07-04 1979-07-04 Unique word detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8465179A JPS568916A (en) 1979-07-04 1979-07-04 Unique word detecting circuit

Publications (1)

Publication Number Publication Date
JPS568916A true JPS568916A (en) 1981-01-29

Family

ID=13836606

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8465179A Pending JPS568916A (en) 1979-07-04 1979-07-04 Unique word detecting circuit

Country Status (1)

Country Link
JP (1) JPS568916A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255065A2 (en) * 1986-07-26 1988-02-03 Nec Corporation Burst signal detection apparatus
EP0430034A2 (en) * 1989-11-21 1991-06-05 Nec Corporation Automatic gain control
US6643342B1 (en) 1998-07-15 2003-11-04 Nec Corporation Unique word detection circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS528196A (en) * 1975-07-04 1977-01-21 Matsushita Electric Ind Co Ltd Press machine of trousers
JPS5437412A (en) * 1977-07-11 1979-03-19 Nec Corp Frame synchronous circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS528196A (en) * 1975-07-04 1977-01-21 Matsushita Electric Ind Co Ltd Press machine of trousers
JPS5437412A (en) * 1977-07-11 1979-03-19 Nec Corp Frame synchronous circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255065A2 (en) * 1986-07-26 1988-02-03 Nec Corporation Burst signal detection apparatus
EP0430034A2 (en) * 1989-11-21 1991-06-05 Nec Corporation Automatic gain control
US6643342B1 (en) 1998-07-15 2003-11-04 Nec Corporation Unique word detection circuit

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