| 摘要 |
<p>PURPOSE:To make a servo circuit for recording and reproducing common, to simplify a circuit constitution and to reduce cost by feeding a tape quantitively with synchronizing with the rotation of a drum and changing the feeding quantity of the tape stepwise in accordance with tracking error informa tion so as to correct tracking at the time of reproducing. CONSTITUTION:The pulse setting circuit 2 of a reproduction circuit sets how many pulses a pulse generation circuit 3 generates in per rotation by the drum, and a tracking error signal is added from a terminal 1 to the generation circuit 2. A PG pulse is inputted from a pulse generator PG to the pulse generation circuit 3. The setting circuit 2 changes the number of pulses which are set in the circuit 3 in accordance with the error signal from the terminal 1, increases or reduces it from a constant state if tracking deviation occurs, and adds plural driving pulses to a stepping motor 6 through an amplifier 5. The common servo mechanism is used at the time of recording and reproducing, and the circuit constitution is simplified.</p> |
