JPS56115081A - Video switching circuit - Google Patents
Video switching circuitInfo
- Publication number
- JPS56115081A JPS56115081A JP1874380A JP1874380A JPS56115081A JP S56115081 A JPS56115081 A JP S56115081A JP 1874380 A JP1874380 A JP 1874380A JP 1874380 A JP1874380 A JP 1874380A JP S56115081 A JPS56115081 A JP S56115081A
- Authority
- JP
- Japan
- Prior art keywords
- circuits
- switches
- video
- groups
- impedance
- 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
- H04N5/268—Signal distribution or switching
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Circuits (AREA)
Abstract
PURPOSE:To reduce the deterioration of characteristics and increase the number of output circuits, dividing a plural number of video switches into a plural number of groups, securing the equal transmission lines that connects between the input circuits and the grouped switches and then supplying the video signals via more than two lines of high impedance. CONSTITUTION:The video signals are received by the input circuits 1-3 and then branched into two parts to be supplied to the high-impedance line groups 10 and 11. The video switches 4-6 are connected to the groups 10 and 11 each. Then the signals branched into two parts are supplied to the switches 4-6 plus 7-9, and a difference of 1/2 or less is secured for both the frequency characteristics and the phase between the supply points A and A' close to the circuits 1-3 and the supply points B and B' distant away from the circuits 1-3. Furthermore the impedance compensating coil L, the phase control capacitor C and the termination resistance R are provided to the circuits 1-3 to secure a phase control among the inputs. Thus the deterioration of characteristics is reduced, and at the same time the number of output circuits are increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1874380A JPS56115081A (en) | 1980-02-18 | 1980-02-18 | Video switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1874380A JPS56115081A (en) | 1980-02-18 | 1980-02-18 | Video switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56115081A true JPS56115081A (en) | 1981-09-10 |
Family
ID=11980129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1874380A Pending JPS56115081A (en) | 1980-02-18 | 1980-02-18 | Video switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56115081A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58159085A (en) * | 1982-03-17 | 1983-09-21 | Nec Corp | Processing device of digital video signal |
| JPS61105988A (en) * | 1984-10-30 | 1986-05-24 | Nippon Telegr & Teleph Corp <Ntt> | Television lecturing device |
-
1980
- 1980-02-18 JP JP1874380A patent/JPS56115081A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58159085A (en) * | 1982-03-17 | 1983-09-21 | Nec Corp | Processing device of digital video signal |
| JPH0145797B2 (en) * | 1982-03-17 | 1989-10-04 | Nippon Electric Co | |
| JPS61105988A (en) * | 1984-10-30 | 1986-05-24 | Nippon Telegr & Teleph Corp <Ntt> | Television lecturing device |
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