Time-base correction in a video recording/playback system

A video signal processing circuit, comprising:

• time base correction means having a first-in/first-out storage device, for performing time base correction on video signals regenerated by temporarily storing and then providing time-base corrected video signals in response to synchronizing signals;
• unfolding means for generating restored bandwidth luminance signals from said time-base corrected video signals provided by said time base correction means;
• luminance processor means for processing said restored bandwidth luminance signals;
• chroma/motion separator means for separating motion signals and chrominance signals from said time-base corrected video signals provided by said time base correction means;
• up-converting means for up converting said chrominance signals generated by said chroma/motion separator means in accordance with a sinusoidal clock;
• and
• sinusoidal generator means comprising an oscillator for generating stable sinusoidal signals, and an up-converting mixer for generating said sinusoidal clock by mixing said stable sinusoidal signals with predetermined counter signals.

A luminance processor, comprising:

• temporal filter means for generating first luminance signals by frame comb filtering video signals;
• spatial filter means for generating second luminance signals by line comb filtering said video signals;
• motion detector means for generating motion signals indicative of motion in said video signals;
• soft switching means for generating output luminance signals to be recorded by mixing said first luminance signals and said second luminance signals in response to said motion signals;
• non-standard input detector means for generating non-standard input signals indicative of time base error in said video signals;
• first multiplexer means for selectively setting said motion signals received by said soft switching means to a first fixed value in response to said non-standard input signals;
• motion processor means for modulating said motion signals to generate modulated motion signals;
• second multiplexer means for selectively setting said modulated motion signals to a second fixed value in response to said non-standard input signals;
• and
• means for generating identification signals, to be combined with said output luminance signals, indicative of said video signals having time base error greater than said threshold value.