JPS57207494A - Signal detector - Google Patents

Signal detector

Info

Publication number
JPS57207494A
JPS57207494A JP56092652A JP9265281A JPS57207494A JP S57207494 A JPS57207494 A JP S57207494A JP 56092652 A JP56092652 A JP 56092652A JP 9265281 A JP9265281 A JP 9265281A JP S57207494 A JPS57207494 A JP S57207494A
Authority
JP
Japan
Prior art keywords
circuit
attenuating component
output
slicer
pal
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.)
Granted
Application number
JP56092652A
Other languages
Japanese (ja)
Other versions
JPS637712B2 (en
Inventor
Masaharu Ishida
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.)
Rohm Co Ltd
Original Assignee
Rohm Co 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 Rohm Co Ltd filed Critical Rohm Co Ltd
Priority to JP56092652A priority Critical patent/JPS57207494A/en
Publication of JPS57207494A publication Critical patent/JPS57207494A/en
Publication of JPS637712B2 publication Critical patent/JPS637712B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Color Television Systems (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE: To discriminate whether the PAL or SECAM system it is, by increasing the rate of an attenuating component to a non-attenuating component in a color burst signal picked up from a composite video signal in different broadcast system with a filter, a multiplier and a slicer.
CONSTITUTION: A color burst signal picked up from a composite video signal from a different broadcast system such as the PAL or SECAM system given at an input terminal 20 is inputted to a filter circuit 24 via an amplitude limit amplifying circuit 22. The circuit 24 is composed of, e.g., a solid-state resonator 26 having 4.4MHz of pass band and 4.25MHz of attenuation band. In the attenuating component and the non-attenuating component obtained from the circuit 24, the rate of attenuation can be extended in a square characteristic with a multiplier 28. Further, the attenuating component signals can be attenuated more at a slicer 30. The output of the circuit 30 is applied to a tuning circuit 46 where a frequency a half of the frequency given as a reciprocal of the horizontal synchronizing signal period is taken as the tuning point. The output of the circuit 46 is fed to a signal discriminating circuit 60 to pick up an output for discrimintion.
COPYRIGHT: (C)1982,JPO&Japio
JP56092652A 1981-06-16 1981-06-16 Signal detector Granted JPS57207494A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56092652A JPS57207494A (en) 1981-06-16 1981-06-16 Signal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56092652A JPS57207494A (en) 1981-06-16 1981-06-16 Signal detector

Publications (2)

Publication Number Publication Date
JPS57207494A true JPS57207494A (en) 1982-12-20
JPS637712B2 JPS637712B2 (en) 1988-02-18

Family

ID=14060388

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56092652A Granted JPS57207494A (en) 1981-06-16 1981-06-16 Signal detector

Country Status (1)

Country Link
JP (1) JPS57207494A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0614320A2 (en) * 1993-03-04 1994-09-07 SANYO ELECTRIC Co., Ltd. Television receiver and television signal determination circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5739685A (en) * 1980-08-21 1982-03-04 Toshiba Corp Automatic switching circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5739685A (en) * 1980-08-21 1982-03-04 Toshiba Corp Automatic switching circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0614320A2 (en) * 1993-03-04 1994-09-07 SANYO ELECTRIC Co., Ltd. Television receiver and television signal determination circuit
EP0614320A3 (en) * 1993-03-04 1994-11-02 Sanyo Electric Co Television receiver and television signal determination circuit.

Also Published As

Publication number Publication date
JPS637712B2 (en) 1988-02-18

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