Apparatus for detecting the stop of a magnetic tape traveling in a magnetic recording and reproducing device

An apparatus for detecting the stop of a magnetic tape traveling in a magnetic recording and reproducing device which includes a rotary drive means for causing a magnetic tape to travel in the recording and reproducing device at a given speed selected from a plurality of speeds, each speed corresponding to at least one of a plurality of functional modes of the recording and reproducing device, the tape stop detecting apparatus comprising:

• first pulse generating means coupled to said tape drive means for generating a given number of pulses per rotation of the rotary drive means;
• reference pulse generating means for producing reference pulses having a reference frequency;
• time measuring means coupled to said first pulse generating means and to said reference pulse generating means for measuring a time interval between the respective pulses generated by said first pulse generating means by counting a number of reference pulses which are generated between respective successive pulses of said first pulse generating means in accordance with the traveling speed of the magnetic tape;
• functional mode selecting means for selecting one of said plurality of functional modes of the magnetic recording and reproducing device;
• means coupled to said functional mode selecting means for presetting a length of time required to detect the stop of the magnetic tape running at a speed corresponding to a selected functional mode;
• and
• detection signal generating means coupled to said time measuring means for detecting that said time interval between respective successive pulses issued from said first pulse generating means, measured by counting of the reference pulses by said time measuring means, exceeds said preset tape stop detection time which corresponds to the selected functional mode, and for then generating a detection signal indicating that the magnetic tape has stopped traveling.