Apparatus and method for correcting capstan load in slow speed reproduction mode
AssigneeGoldstar Co., Ltd.
InventorYong Jae Kim
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Abstract
An apparatus and a method are provided for rapidly determining, without iteration, a desired value of a time interval between a head switching signal and the next capstan motor stop signal for a slow speed reproduction mode which intermittently stops a capstan motor of a video cassette recorder during a slow speed reproduction mode of a video cassette recorder. The invention allows stop points during a slow speed reproduction mode to be made independent of capstan load.
Claims19
A method for correcting a capstan load in a slow speed reproduction mode, comprising the steps of:
- outputting initial values of first, second, third, fourth, and fifth operational time intervals for a capstan motor;
- obtaining a sixth operational time interval for the capstan motor by summing the first through fifth operational time intervals;
- detecting the number of capstan frequency generating signals generated from the capstan motor during the obtained sixth operational time interval;
- comparing the detected number of the capstan frequency generating signals with a predetermined number for each speed mode;
- calculating a new sixth operational time interval for the capstan motor based on the comparison result;
- and
- correcting the capstan load based on the calculation result.
An apparatus for correcting a capstan load in a slow speed reproduction mode of a video cassette recorder having a capstan motor for outputting capstan frequency generating signals, the apparatus comprising;
- wave shaping means for shaping the capstan frequency generating signals generated by the capstan motor into wave shaped capstan frequency generating signals;
- detection means for detecting the number of the wave shaped capstan frequency generating signals for a predetermined period, the detection means outputting initial values of first through fifth operational time intervals for the capstan motor, obtaining a sixth operational time interval for the capstan motor by summing the first through fifth operational time intervals, and detecting the number of the capstan frequency generating signals during the obtained sixth operational time interval;
- comparison means for comparing the detected number of the wave shaped capstan frequency generating signals with a predetermined number;
- and
- control means for calculating operational time intervals for the capstan motor based on the comparison result and compensating the calculated operational time intervals to correct the capstan load.
Dependencies are inferred from the claim text.