Optical communications – Hybrid communication system
Reexamination Certificate
2006-08-29
2006-08-29
Payne, David C. (Department: 2613)
Optical communications
Hybrid communication system
C398S116000, C398S202000, C398S203000, C398S204000
Reexamination Certificate
active
07099588
ABSTRACT:
The present invention provides several embodiments of a video carrier signal detection circuit included in an optical transmitter for either disabling an oscillator that provides dithering tones or attenuating the power level of the dither tones. A first detection circuit detects the presence of a video carrier signal by analyzing a known video channel. The power level of a video sync pulse included in the known video channel is then compared to a reference power level. A second detection circuit compares the composite power level of the RF signals in a predetenmined frequency spectrum with a reference power level to determine either the presence of a video carrier signal or an increase in the channel loading. Upon detection of a video carrier signal or an increase in composite power, an enable signal is provided to either the oscillator or an attenuating device depending upon the detection circuit.
REFERENCES:
patent: 5331453 (1994-07-01), Lipsky
Al-Araji Saleh R.
Skrobko John
Payne David C.
Scientific-Atlanta, Inc.
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