JPS6467081A - Discriminating circuit for video signal form - Google Patents
Discriminating circuit for video signal formInfo
- Publication number
- JPS6467081A JPS6467081A JP22331787A JP22331787A JPS6467081A JP S6467081 A JPS6467081 A JP S6467081A JP 22331787 A JP22331787 A JP 22331787A JP 22331787 A JP22331787 A JP 22331787A JP S6467081 A JPS6467081 A JP S6467081A
- Authority
- JP
- Japan
- Prior art keywords
- data
- signal
- obtaining
- horizontal
- horizontal synchronizing
- 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 effectively identify a signal form by providing a means for obtaining data of the number of effective scanning lines of the effective scanning line signal of an input luminance signal, a means for obtaining data of the number horizontal synchronizing signals of the input luminance signal, a means for obtaining the frequency data of the horizontal synchronizing signal, and a decoder for deciding the form of the input luminance signal from these data. CONSTITUTION:A counting and latch means 19 for obtaining the data of the number of effective scanning lines by counting the effective scanning line signal for one vertical period and latching a counted value and a horizontal counter means 20 for counting the number of horizontal synchronizing signals of the input luminance signal, and obtaining the data of the number of horizontal synchronizing signals are provided. Further, a converting means 21 in which the horizontal synchronizing signal is applied with frequency/voltage conversion, and the voltage is applied to analog/digital conversion to obtain horizontal frequency data and the decoder means 23 for inputting the effective scanning line number data, data of the number of horizontal synchronizing signals data and the horizontal frequency data and obtaining the discriminating output of the signal form of the input luminance signal based on these data are provided. Thereby, even when the horizontal frequency approaches, the form can be correctly identified.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22331787A JPS6467081A (en) | 1987-09-07 | 1987-09-07 | Discriminating circuit for video signal form |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22331787A JPS6467081A (en) | 1987-09-07 | 1987-09-07 | Discriminating circuit for video signal form |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6467081A true JPS6467081A (en) | 1989-03-13 |
Family
ID=16796258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22331787A Pending JPS6467081A (en) | 1987-09-07 | 1987-09-07 | Discriminating circuit for video signal form |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6467081A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04116482U (en) * | 1991-03-28 | 1992-10-19 | 日本電気ホームエレクトロニクス株式会社 | HDTV receiver |
US5347318A (en) * | 1992-06-16 | 1994-09-13 | Canon Kabushiki Kaisha | Apparatus for processing video signals having different aspect ratios |
-
1987
- 1987-09-07 JP JP22331787A patent/JPS6467081A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04116482U (en) * | 1991-03-28 | 1992-10-19 | 日本電気ホームエレクトロニクス株式会社 | HDTV receiver |
US5347318A (en) * | 1992-06-16 | 1994-09-13 | Canon Kabushiki Kaisha | Apparatus for processing video signals having different aspect ratios |
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