JPS57140080A - Discriminating circuit for presence of broadcasting wave - Google Patents
Discriminating circuit for presence of broadcasting waveInfo
- 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
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
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)
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)
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 |
-
1981
- 1981-02-20 JP JP2453981A patent/JPS57140080A/en active Pending
Patent Citations (1)
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)
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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