JPS57154979A - Video signal mixing circuit system - Google Patents
Video signal mixing circuit systemInfo
- Publication number
- JPS57154979A JPS57154979A JP3974381A JP3974381A JPS57154979A JP S57154979 A JPS57154979 A JP S57154979A JP 3974381 A JP3974381 A JP 3974381A JP 3974381 A JP3974381 A JP 3974381A JP S57154979 A JPS57154979 A JP S57154979A
- Authority
- JP
- Japan
- Prior art keywords
- display
- circuit
- video signal
- signal
- display 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/265—Mixing
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Circuits (AREA)
Abstract
PURPOSE:To realize an easy-to-see method for the mixed display signal, by having a producing circuit for the display signals of both positive and negative polarities and switching the display signal in accordance with the level of a video signal. CONSTITUTION:The video signal input (a) is divided into two parts by a dividing circuit 10. One of the divided two inputs is applied to a comparator 12 through an LPF11. A display signal producing circuit 14 is provided to a TV monitor to mix the display signal with the video signal and display them. The circuit 14 applies the signals of positive and negative polarities to a switch circuit 15 as the display signal. The comparator 12 compares the reference level given from a reference voltage circuit 13 with the output 6 of a low pass filter and controls the circuit 15 to switch a display signal (d) of positive polarity and a display signal (e) of negative polarity when the output (b) is large and small respectively. The selected display signal is mixed with the video signal at a mixing circuit 17 and through a level control circuit 16. Thus the mixed display is carried out in accordance with the level and gradation of the video signal to ensure an easy-to-see display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3974381A JPS57154979A (en) | 1981-03-19 | 1981-03-19 | Video signal mixing circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3974381A JPS57154979A (en) | 1981-03-19 | 1981-03-19 | Video signal mixing circuit system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57154979A true JPS57154979A (en) | 1982-09-24 |
Family
ID=12561438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3974381A Pending JPS57154979A (en) | 1981-03-19 | 1981-03-19 | Video signal mixing circuit system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57154979A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63187973A (en) * | 1987-01-30 | 1988-08-03 | Ricoh Co Ltd | Character data superimposing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50106516A (en) * | 1973-12-25 | 1975-08-22 |
-
1981
- 1981-03-19 JP JP3974381A patent/JPS57154979A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50106516A (en) * | 1973-12-25 | 1975-08-22 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63187973A (en) * | 1987-01-30 | 1988-08-03 | Ricoh Co Ltd | Character data superimposing device |
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