GB1170118A - Polar Display of Television Chrominance Vectors. - Google Patents
Polar Display of Television Chrominance Vectors.Info
- Publication number
- GB1170118A GB1170118A GB2225967A GB2225967A GB1170118A GB 1170118 A GB1170118 A GB 1170118A GB 2225967 A GB2225967 A GB 2225967A GB 2225967 A GB2225967 A GB 2225967A GB 1170118 A GB1170118 A GB 1170118A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- input signal
- fed
- circuit
- switching
- 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.)
- Expired
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)
- Processing Of Color Television Signals (AREA)
- Color Television Systems (AREA)
Abstract
1,170,118. Vectorscope demodulating circuit. BRITISH BROADCASTING CORP. 2 May, 1968 [12 May, 1967], No. 22259/67. Heading H4F. A demodulating circuit for a vectorscope for use with a PAL television signal which allows the +V vector direction to be unambiguously identified on the display in relation to the colour burst vector comprises two synchronous demodulators 6 and 8, one 6 being fed with the input signal and a reference phase carrier signal produced by an automatic phase control loop consisting of a synchronous phase detector 2 controlling a variable reactance 3 across a crystal oscillator 4, and the other one 8 being fed with the input signal and a quadrature phase carrier signal produced from the colour burst of the input signal by a 90 degrees phase shift network 9 fed from oscillator 4. A switching circuit comprising modulator 10 and bistable circuit 11 is arranged to periodically invert the input signal applied to demodulator 8. This switching circuit is phased by comparing the phase of the output of the oscillator with the instantaneous phase of an applied colour burst. Further the switching waveform is so synchronized to the line pulses that switching transients occur when no colour carrier is present.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2225967A GB1170118A (en) | 1967-05-12 | 1967-05-12 | Polar Display of Television Chrominance Vectors. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2225967A GB1170118A (en) | 1967-05-12 | 1967-05-12 | Polar Display of Television Chrominance Vectors. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1170118A true GB1170118A (en) | 1969-11-12 |
Family
ID=10176468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2225967A Expired GB1170118A (en) | 1967-05-12 | 1967-05-12 | Polar Display of Television Chrominance Vectors. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1170118A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2220321A (en) * | 1988-06-09 | 1990-01-04 | Magni Systems Inc | Multi-standard vectorscope for colour video signals |
-
1967
- 1967-05-12 GB GB2225967A patent/GB1170118A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2220321A (en) * | 1988-06-09 | 1990-01-04 | Magni Systems Inc | Multi-standard vectorscope for colour video signals |
| GB2220321B (en) * | 1988-06-09 | 1992-07-22 | Magni Systems Inc | Multi-standard vectorscope |
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