| 摘要 |
Magnetic recording and playback means employing cassette tape in which signals representative of the rotation period of a tape reel stand are supplied to a flip-flop ring counter which also receives reference input signals from another pulse emitter and which can actuate a linear array of externally viewable display means, the number of display means actuated in this array being dependent on the rotation period of the reel stand, whereby, since this rotation period is proportional to the amount of tape on a reel supported by the stand, there is given an immediately appreciable indication of the amount of tape remaining available for recording or playback. |
