| 摘要 |
<p>PURPOSE:To record much audio information by switching duty ratio at a successive recording time and an intermittent recording time with the aid of changing the position of a magnetization inversion part in a control signal. CONSTITUTION:A positive integer multiple video in one frame is intermittently recorded. Simultaneously, in a magnetic recording and reproducing device which executes the successive recording in a prescribed time in the case that an instruction signal is inputted at the intermittent recording time, an output signal is switched to an 'H' level and supplied to a control signal generation circuit 32 by a timing circuit 31 when an alarm signal is inputted to the circuit 31 from an alarm sensor. By changing the position of the magnetization inversion part which is not used for controlling the feeding of a tape at a reproducing time, the duty ratio of the generated control signal is changed to 20% from 60% by the circuit 32. Therefore, only by adding a duty ratio detection circuit 44 to the control signal generation circuit 32 system, alarm recording/ reproducing can be executed. Besides, more audio information is recorded without sacrificing the audio information.</p> |
