JPS56149193A - Digital color signal generating circuit - Google Patents
Digital color signal generating circuitInfo
- Publication number
- JPS56149193A JPS56149193A JP3499380A JP3499380A JPS56149193A JP S56149193 A JPS56149193 A JP S56149193A JP 3499380 A JP3499380 A JP 3499380A JP 3499380 A JP3499380 A JP 3499380A JP S56149193 A JPS56149193 A JP S56149193A
- Authority
- JP
- Japan
- Prior art keywords
- chroma
- signal
- level
- levels
- romc
- 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
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
PURPOSE:To generate a digital chroma signal by a simple logic circuit by storing the half-cycle components of a chromaticity carrier signal in ROMs and by adding the polarity code signals that correspond to sample phases to the output signals of those ROMs. CONSTITUTION:In ROMb and ROMc, the chroma levels of the half-cycle cmponents of a chroma signal are stored. Chroma-control variable resistor VR1 and A/D converter (a) are used for an address generator; and ROMb outputs the 1st chroma level, and ROMc the 2nd chroma level 90 deg. out of phase with the 1st one. Those 1st and 2nd chroma levels and a switching signal from counter (e) are supplied to switch (f), which outputs the 1st and 2nd chroma levels by turns in response to every clock. Next, adder-subtractor (h) adds or subtracts the chroma level signal of the digital chroma signal to and from the control signal of variable resistor VR2 for luminance control with a polarity code signal. Further, blanking gate circuit (i) holds a blanking section at the black level to obtain the required signal at terminal (j).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3499380A JPS56149193A (en) | 1980-03-18 | 1980-03-18 | Digital color signal generating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3499380A JPS56149193A (en) | 1980-03-18 | 1980-03-18 | Digital color signal generating circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56149193A true JPS56149193A (en) | 1981-11-18 |
Family
ID=12429659
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3499380A Pending JPS56149193A (en) | 1980-03-18 | 1980-03-18 | Digital color signal generating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56149193A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6064684U (en) * | 1983-10-12 | 1985-05-08 | 日本放送協会 | Transport color signal generator |
-
1980
- 1980-03-18 JP JP3499380A patent/JPS56149193A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6064684U (en) * | 1983-10-12 | 1985-05-08 | 日本放送協会 | Transport color signal generator |
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