JPS57140080A - Discriminating circuit for presence of broadcasting wave - Google Patents

Discriminating circuit for presence of broadcasting wave

Info

Publication number
JPS57140080A
JPS57140080A JP2453981A JP2453981A JPS57140080A JP S57140080 A JPS57140080 A JP S57140080A JP 2453981 A JP2453981 A JP 2453981A JP 2453981 A JP2453981 A JP 2453981A JP S57140080 A JPS57140080 A JP S57140080A
Authority
JP
Japan
Prior art keywords
horizontal synchronizing
prescribed
counter
broadcasting waves
discriminating circuit
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
JP2453981A
Other languages
Japanese (ja)
Inventor
Hisao Mogi
Koji Morita
Osamu Matsunaga
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP2453981A priority Critical patent/JPS57140080A/en
Priority to GB8204478A priority patent/GB2094080B/en
Priority to CA000396345A priority patent/CA1170354A/en
Priority to US06/349,651 priority patent/US4439787A/en
Priority to DE19823205835 priority patent/DE3205835A1/en
Priority to FR8202708A priority patent/FR2500249B1/fr
Priority to NL8200651A priority patent/NL8200651A/en
Publication of JPS57140080A publication Critical patent/JPS57140080A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable to discriminate the presence of broadcasting waves accurately, by detecting the state of a horizontal synchronizing signal within a prescribed period over a plurality of times.
CONSTITUTION: A horizontal synchronizing signal from a terminal 71 is given to a counter 72. The counter 72 counts the number of horizontal synchronizing signals for a prescribed period, e.g., for 1ms. When this count value is within a prescribed range, "1" is outputted and it is applied to a counter 79, where the number of times of the count value within a prescribed range when the count of the horizontal synchronizing signals at 1ms. interval is done for a plurality of times, e.g., 5 times. When this number of times is a prescribed rate or more, e.g., 80% or more, the presence of broadcasting waves is dicriminated. Thus, the presence of the broadcasting waves can be discriminated very accurately and the allowable range is given for each case, allowing to make discrimination without hindrance even for fast feeding and reproduction of a VTR.
COPYRIGHT: (C)1982,JPO&Japio
JP2453981A 1981-02-18 1981-02-20 Discriminating circuit for presence of broadcasting wave Pending JPS57140080A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP2453981A JPS57140080A (en) 1981-02-20 1981-02-20 Discriminating circuit for presence of broadcasting wave
GB8204478A GB2094080B (en) 1981-02-18 1982-02-16 Automatic fine tuning circuits for television receivers
CA000396345A CA1170354A (en) 1981-02-18 1982-02-16 Aft circuit
US06/349,651 US4439787A (en) 1981-02-18 1982-02-17 AFT Circuit
DE19823205835 DE3205835A1 (en) 1981-02-18 1982-02-18 METHOD AND TUNING CIRCUIT FOR AUTOMATICALLY ADJUSTING THE TUNING OF AN OVERLAY TUNING LEVEL OF A TELEVISION RECEIVER
FR8202708A FR2500249B1 (en) 1981-02-18 1982-02-18
NL8200651A NL8200651A (en) 1981-02-18 1982-02-18 AUTOMATIC FINE TUNING.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2453981A JPS57140080A (en) 1981-02-20 1981-02-20 Discriminating circuit for presence of broadcasting wave

Publications (1)

Publication Number Publication Date
JPS57140080A true JPS57140080A (en) 1982-08-30

Family

ID=12140952

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2453981A Pending JPS57140080A (en) 1981-02-18 1981-02-20 Discriminating circuit for presence of broadcasting wave

Country Status (1)

Country Link
JP (1) JPS57140080A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59193678A (en) * 1983-04-16 1984-11-02 Fujitsu General Ltd Television signal discriminating circuit
JPS6181274U (en) * 1984-11-02 1986-05-29
JPS63236481A (en) * 1987-03-25 1988-10-03 Sony Corp Television receiver

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5445524A (en) * 1977-09-17 1979-04-10 Sharp Corp Signal discrimination circuit for automatic channel selector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5445524A (en) * 1977-09-17 1979-04-10 Sharp Corp Signal discrimination circuit for automatic channel selector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59193678A (en) * 1983-04-16 1984-11-02 Fujitsu General Ltd Television signal discriminating circuit
JPS6181274U (en) * 1984-11-02 1986-05-29
JPS63236481A (en) * 1987-03-25 1988-10-03 Sony Corp Television receiver

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