Apparatus and method for counting tape running time of video tape recorders

摘要

A tape running time counting apparatus for video tape recorder includes a detecting device for detecting the existence or absence of playback control signals on a video tape, a pulse generating device for generating pulses proportionate to the rotational speed of one of a supply and a takeup reel and a counting device for counting real time of running of the video tape based on the playback control signals, when present, and for calculating the real time of running of the video tape after converting the number of pulses from pulse generating device in the absence of the playback control signals. If playback control signals are recorded the video tape, the tape running time is counted in real time based on the control signals. If the control signals are not recorded, the number of pulses which correspond to the rotational speed of the supply and/or take-up reel is converted into real time, thereby computing the tape running time. A method for count real time running of a tape is also disclosed.