GB1306164A - - Google Patents
Info
- Publication number
- GB1306164A GB1306164A GB2286870A GB2286870A GB1306164A GB 1306164 A GB1306164 A GB 1306164A GB 2286870 A GB2286870 A GB 2286870A GB 2286870 A GB2286870 A GB 2286870A GB 1306164 A GB1306164 A GB 1306164A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- signal
- arrangement
- colour
- flesh
- 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
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/643—Hue control means, e.g. flesh tone control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
1306164 Colour television MAGNAVOX CO 12 May 1970 [22 Sept 1969] 22868/70 Heading H4F An arrangement for automatically adjusting the phase angle of the chrominance demodulating signal in a NTSC colour television receiver comprises a null detector 38 which compares the phase distribution of the colour energy in the signal as received from 34 with the phase of the reference signal obtained at 32 from the colour burst and determines a phase correction to be effected at 40 to minimize the energy in the reference phase. This correction is based on the assumption that flesh tones often predominate and that since the I phase (flesh) is at 90 degrees to the reference phase ( - Q), adjustment of the latter to maintain the quadrature arrangement will improve the reproduction of flesh tones. Fig. 3 (not shown) illustrates schematically the generation of a measure of "error" of the reference signal phase by adding the positive peak signal from the Q-axis demodulation output to the inverted negative peak signal, and the use of this in a phase corrector in a feedback loop. In an alternative arrangement (Fig. 4, not shown) the output of the -Q reference generator is passed to a circuit where it is varied between about - Q - 40 and - Q + 40 degrees in sawtooth manner at about 2 c.p.s. and used as demodulating signal in an auxiliary circuit whose output is rectified and smoothed over one frame period. The minimum value of this is detected and used to select the appropriate corrected - Q phase. The arrangement may also be used to adjust the chrominance signal before transmission, using the Q adder to derive the- Q phase reference signal which is then used as above described.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US85994269A | 1969-09-22 | 1969-09-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1306164A true GB1306164A (en) | 1973-02-07 |
Family
ID=25332129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2286870A Expired GB1306164A (en) | 1969-09-22 | 1970-05-12 |
Country Status (3)
Country | Link |
---|---|
CA (1) | CA997058A (en) |
DE (1) | DE2029121A1 (en) |
GB (1) | GB1306164A (en) |
-
1970
- 1970-04-30 CA CA081,578A patent/CA997058A/en not_active Expired
- 1970-05-12 GB GB2286870A patent/GB1306164A/en not_active Expired
- 1970-06-12 DE DE19702029121 patent/DE2029121A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CA997058A (en) | 1976-09-14 |
DE2029121A1 (en) | 1971-04-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |