H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/62
H04N 9/12 (2006.01) H04N 7/045 (2006.01) H04N 9/64 (2006.01) H04N 11/08 (2006.01) H04N 11/14 (2006.01)
Patent
CA 1248219
- 15 - SIGNAL TO NOISE RATIO ENHANCEMENT USING BASEBAND SIGNALS IN AN FM TELEVISION SYSTEM ABSTRACT In an FM television signal angle modulated with luminance and chrominance information, there exists a high degree of correlation between picture elements occurring one line period apart. In an effort to steer the pass band of a tunable bandpass filter to the instantaneous frequency of the incoming television signal, a steering signal is developed which utilizes this high degree of correlation. For NTSC systems, luminance information is delayed by one-line period (63.5 us in the U.S.A.) and combined with suitably delayed chrominance information to form the filter's steering signal. For MAC systems, one-line delayed luminance and two-line delayed chrominance informa- tion are alternately applied to the filter as its steering signal. By steering the pass band of the filter to the incoming signal, maximum signal will be captured with minimum noise, enhancing the signal-to- noise ratio of a color television system.
497314
Gowling Lafleur Henderson Llp
Scientific Atlanta Inc.
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