Patent ID: 6771883
Filing Date: 2004-08-03
Classification: G11B,H04N

Abstract:
A tape travelling speed control device equipped with a supply reel pedestal for driving a supply reel and a winding reel pedestal for driving a winding reel, of a videotape, said device comprising:rotation detection elements for outputting reel pulses when the supply reel pedestal and the winding reel pedestal are rotated at a predetermined angle respectively, RAM for storing a ratio of intervals of the reel pulses outputted by the respective rotation detection elements, and a CPU for controlling the tape travelling speed by calculating the ratio between the intervals, controlling to store the ratio to the RAM, comparing the ratio detected before the tape is stopped with the ratio detected after the tape is traveled, and determining that the ratio is correct when an error of the ratios is smaller than a threshold value.