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This patent was reissued on July 26, 1983 as patent
USRE31326
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 Title: |
US3872497:
SIGNAL TRANSLATING APPARATUS FOR COMPOSITE SIGNAL SUBJECT TO JITTER
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Amery, John Gordon; Indianapolis, IN
Jorgenson, Robert Warren; Indianapolis, IN
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| Assignee: |
RCA Corporation, New York, NY
other patents from RCA CORPORATION (466175) (approx. 7,929)
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| Published / Filed: |
1975-03-18
/ 1973-04-13
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| Application Number: |
US1973000351036
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| IPC Code: |
Advanced:
H04N 9/64;
H04N 9/78;
H04N 9/85;
Core:
H04N 9/82;
more...
IPC-7:
H04N 9/12;
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| U.S. Class: |
Current:
386/025;
348/665;
348/E09.036;
348/E09.042;
386/E09.044;
Original:
358/004;
358/031;
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| Field of Search: |
178/5.4 R,5.2 R,5.4 CD
358/031,4
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| Priority Number: |
| 1973-04-13 |
US1973000351036 |
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| Abstract: |
Circuits are disclosed for processing color encoded video signals, encoded per a format wherein a chrominance signal in the form of a modulated subcarrier is buried in spectrum "troughs" in the midband of a wider band luminance signal, an illustrative use of the encoding format being in video disc recording. The processing circuits serve, in use with composite signals developed during video disc playback, to convert an input composite signal of buried subcarrier format to an output composite signal of NTSC format. Comb filtering is employed to separate buried subcarrier chrominance signal from midband luminance signal components. A heterodyning step preceding comb filtering is performed in a manner substantially precluding "jitter" of played back signals from disturbing accuracy of comb filter separating action, enabling use of a single 1H delay line form for the comb filter and enabling use of a relatively inexpensive, narrowband structure for the single delay line. The comb filter output provides a chrominance signal in a band suitable for output composite signal use. The output chrominance signal is also used in a subtractive process to effect comb filtering of the luminance signal to remove therefrom midband chrominance signals.
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| Attorney, Agent or Firm: |
Whitacre, Eugene M. ;
Meagher, William H. ;
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| Primary / Asst. Examiners: |
Murray, Richard; Saffian, Mitchell
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 4 known family members
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First Claim:
Show all 15 claims |
1. A color image signal translating system comprising, in combination:
- means for providing an input composite signal including (a) a signal representative of the chrominance of a color image and occupying only a given frequency band, and (b) a signal representative of the luminance of said color image and including a first luminance signal portion occupying said given frequency band and additional luminance signal portions having frequencies outside said given frequency band; said first luminance signal portion including signal components normally subject to occupancy of only a first plurality of regularly spaced spectral locations extending over said given frequency band, and said chrominance signal including signal components normally subject to occupancy of only a second plurality of spectral locations interleaved with said first plurality; said composite signal providing means being subject to abnormal operation causing spurious variations of the frequencies of said signal components about said normally occupied spectral locations;
- a source of oscillations
- means for varying the frequency of the oscillations provided by said source about a nominal value in synchronism with said spurious variations during abnormal operation of said composite signal providing means;
- means for heterodyning oscillations provided by said source with at least the portion of said composite signal occupying said given frequency band;
- means for deriving an output from said heterodyning means inclusive of a frequency shifted chrominance signal occupying a frequency band different from said given frequency band, and a frequency shifted luminance signal portion corresponding to said first luminance signal portion and sharing said different frequency band;
- and a comb filter responsive to said output derived from said heterodyning means for passing said frequency shifted chrominance signal to the substantial exclusion of said frequency shifted luminance signal portion.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 10 U.S. patent(s) that reference this one
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