H - Electricity – 03 – L
Patent
H - Electricity
03
L
331/58
H03L 7/06 (2006.01) H03L 7/099 (2006.01) H04N 9/44 (2006.01) H04N 9/45 (2006.01)
Patent
CA 1196067
Abstract Color reference oscillator comprises a non-inverting amplifier, with positive feedback via a crystal filter linking its output and input. A quadrature phase shift network, coupled to the filter output, delivers phase shifted signals to a pair of independently controlled amplifiers. One of the controlled amplifiers is responsive to control voltage outputs of a burst-responsive phase detector so as to inject phase shifted signals into the oscillator loop, as and when required, to effect synchroniza- tion of oscillator with burst component of incoming color television signal. The second of the controlled amplifiers is responsive to a reference DC voltage and to a manually adjustable DC control voltage, and develops a phase shifted signal output, of a magnitude and polarity dependent upon the magnitude and sense of the difference, if any, between the respective DC voltages, for combination with the non-inverting amplifier's output. Variation of the manually adjustable control voltage provides an adjustment of the free-running frequency of the oscillator.
427769
Harwood Leopold A.
Shanley Robert L. II
Morneau Roland L.
Rca Corporation
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