H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/88, 352/18.4
H04N 5/04 (2006.01) H03K 4/50 (2006.01) H04N 5/12 (2006.01)
Patent
CA 1068813
HORIZONTAL AFC CIRCUIT ABSTRACT OF THE DISCLOSURE A horizontal AFC circuit comprising a phase detector circuit supplied with a horizontal synchronizing signal separated from a television video signal and with a comparison signal and carrying out phase comparison, a filter circuit for filtering the output of the phase detector circuit, a horizontal oscillator circuit supplied with the output of the filter circuit and oscillating with an oscillation frequency controlled thereby, a horizontal deflection circuit for forming the output signal of the horizontal oscillator circuit into a horizontal deflection pulse, a wave shaping circuit operating upon being supplied with the output pulse of the horizontal deflection circuit to wave shape this output pulse and to supply the resulting output signal thereof as said comparison signal to the phase detector circuit, means for supplying a control pulse of a pulse width corresponding to a vertical blanking period of the television video signal, and loop gain control means supplied with the control pulse and operating to cause the loop gain of the horizontal AFC circuit to be relatively large in the pulse width duration and to cause the loop gain to be relatively small in a period other than said pulse width duration.
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