| 摘要 |
A network is described for use in a VIR (Vertical Interval Reference) correction system to correct the phase and amplitude, respectively, of the color bursts and chrominance associated with a color television signal. The network includes a phase shifting network receiving the uncorrected color signal for developing a phase-shifted color signal. The uncorrected color signal, the phase-shifted color signal, and a phase-error signal are applied to a phase control circuit which develops color burst outputs which are in phase with the color bursts in the uncorrected color signal when no phase correction is required. When the phase error signal indicates that correction is required, the phase of its color burst output is varied over a range between the phases of the uncorrected color signal and the phase-shifted color signal. To process the chrominance portion of the color signal, a gain control circuit receives the uncorrected color signal and adjusts its amplitude in response to an amplitude error signal. The phase-corrected bursts are combined with the amplitude-corrected chrominance to provide a composite corrected color signal.
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