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SMPTE Journal ( Volume: 86, Issue: 1, January 1977)
[ACTIVE]

Comb Filter Improvement with Spurious Chroma Deletion

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPTE
Volume
86, No. 1, pp. 1–5
Abstract
The problem of uncancelled or spurious chroma in a luminance signal can now be effectively eliminated. This common problem arises when (1) delay-line comb filters are used to separate the luminance and chrominance from an NTSC-encoded color television signal and (2) video changes over three successive TV lines at frequencies above about 2.5 MHz are not negligible. The most noticeable effect is the appearance of scintillating serrations along horizontal edges where vertical hue or saturation changes have occurred. To delete spurious chroma from the luminance signal, a detection circuit has been devised which can determine when chrominance transitions are occurring in the vertical direction. When such transitions are detected, a gate is generated which causes the luminance signal to be suitably filtered, thereby eliminating the spurious chroma that otherwise would have appeared. The gated filtering of chroma is controlled by a manually adjustable threshold so that chroma deletion can be utilized at as low a chrominance differential level as is permitted by the existing signal-to-noise ratio. Experience with this device in actual operations has been most satisfactory.
Publication Date
1977-01-01
DOI
10.5594/J06784
ISSN
Print: 0036-1682
Link
https://doi.org/10.5594/J06784
Author(s)
Arthur KaiserCBS Technology Center, 227 High Ridge Rd., Stamford, CT 06905
Copyright
© 1977 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • Color Decoding a PCM NTSC Television Signal [Active]
  • Combed Aperture Equalization for Color Television Cameras [Active]
  • 1. Kallman H. E. , “Transversal Filters,” Proc. IRE 302 310 , July 1940 . EXTERNAL
  • 11. Rossi J. P. , “Adaptive Digital Comb Filter,” Paper presented at IERE Conference on Video and Data Recording, Birmingham, England, 20–22, July 1976 . EXTERNAL
  • 2. Stateman M. J. , “Theoretical Improvement in Signal-to-Noise Ratio of Television Signals by Equivalent Comb Filter Techniques,” IRE Natl. Conc. Rec. , 2 : Pt, 4, 13 – 17 , 1954 . EXTERNAL
  • 3. George S. F. , “Comb Filters for Pulsed Radar Use,” Proc. IRE : 1159 – 1165 , July 1954 . EXTERNAL
  • 4. White W. D. , “Recent Advances in the Synthesis of Comb Filters,” IRE Natl. Conv. Rec. , 5 : Pt 2, 186 – 199 , 1957 . EXTERNAL
  • 5. Flesher G. T. , “The General Theory of Comb Filters,” Proc. N.E.C. , 14 : 282 – 295 , 1958 . EXTERNAL
  • 6. Sendberg I. W. , “The Analysis of Networks Containing Periodically Variable Piecewise-Constant Elements,” Proc. N.E.C. , 17 : 81 94 , 1961 . EXTERNAL
  • 7. Rudin Harry Jr. , “Automatic Equalization Using Transversal Filters,” IEEE Spectrum : 53 – 59 , Jan. 1967 . EXTERNAL
  • 9. Golding L. S. , “Frequency Interleaved Sampling of a Color Television Signal,” IEEE Trans, on Comm. Technology , Com-19: No. 6 , 972 – 979 , Dec. 1971 . EXTERNAL
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Arthur Kaiser; Comb Filter Improvement with Spurious Chroma Deletion, SMPTE Journal ( Volume: 86, Issue: 1, January 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J06784
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Arthur Kaiser; Comb Filter Improvement with Spurious Chroma Deletion, SMPTE Journal ( Volume: 86, Issue: 1, January 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J06784

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Arthur Kaiser; Comb Filter Improvement with Spurious Chroma Deletion, SMPTE Journal ( Volume: 86, Issue: 1, January 1977); SMPTE, 1977. Available at https://doi.org/10.5594/J06784
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<span class="citation">Arthur Kaiser; <cite>Comb Filter Improvement with Spurious Chroma Deletion</cite>, SMPTE Journal ( Volume: 86, Issue: 1, January 1977); SMPTE, 1977. Available at <a href="https://doi.org/10.5594/J06784" target="_blank" rel="noopener">https://doi.org/10.5594/J06784</a></span>

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Preview:
Arthur Kaiser; Comb Filter Improvement with Spurious Chroma Deletion, SMPTE Journal ( Volume: 86, Issue: 1, January 1977); SMPTE, 1977
doi: 10.5594/J06784
url: https://doi.org/10.5594/J06784
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Arthur Kaiser; <cite id="bib-10-5594-j06784">Comb Filter Improvement with Spurious Chroma Deletion</cite>, SMPTE Journal ( Volume: 86, Issue: 1, January 1977); SMPTE, 1977
<span class="doi">10.5594/J06784</span>
</li>

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