G - Physics – 11 – B
Patent
G - Physics
11
B
341/48, 352/21.2
G11B 17/00 (2006.01) G11B 19/24 (2006.01) G11B 19/28 (2006.01) H04N 5/93 (2006.01)
Patent
CA 1059616
ABSTRACT OF THE DISCLOSURE A servo system for use in a video signal recording and playback apparatus to control rotation of an electric motor which drives a recording medium containing the composite video signal is provide. Means are provided for generating a reference signal with a time period equal to a multiple of the horizontal synchron- izing period of the composite video signal. The signal generating means comprises an oscillator circuit which produces a reference signal having a frequency in the range from 1/260 to 1/270 of the horizontal synchronizing frequency. A servo control circuit controls the speed of rotation of the electric motor in response to any phase difference between the reference signal and the rotational signal indicative of the rotational speed of the electric motor.
193010
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