| 摘要 |
PURPOSE:To obtain a jitter correcting means leading to low cost and high performance by using an oscillated frequency of a VCO so as to modulate a high frequency portion of a reproduced luminance signal and providing nearly same jitter component as that of the reproduced luminance signal to the oscillated frequency of the VCO. CONSTITUTION:An FM luminance signal reproduced from a head 3 is amplified by a preamplifier 4 and the frequency is corrected by a peaking circuit 5. After the high frequency of an output of the peaking circuit 5 is converted at a high frequency converting circuit 11, one frequency is extracted by a BPF12 and demodulated by a demodulation circuit 6. On the other hand, a horizontal synchronizing signal (h) separated from the luminance signal by a synchronizing separator circuit 9 is compared for the phase with a reference signal hr at a phase comparator 15 and its output (v) is fed to the VCO17 via an LPF16. As a result, an output of the VCO17 has nearly the same jitter component as the reproduced luminance signal and the reproduced luminance signal is subject to high frequency conversion by a high frequency converting circuit 11 based on the signal, then the luminance signal suppressed with jitter component is obtained. |
