| 摘要 |
<p>PURPOSE:To make it possible to accomplish prompt shift to reproduction by supplying an automatic changing device with pulses of such a frequency as is substantially equal to that of the CTL pulses to be reproduced in case a temporary stop or a high speed condition effected during the reproduction. CONSTITUTION:There is provided an automatic tape speed changing device of the type, in which the pitch of the CTL pulses recorded in a tape during reproduction is detected by a CTL head 12 and fed to an automatic change-over circuit 13 to discriminate the tape speed during the recording operation so that the tape speed during the reproduction may be automatically concident with that during the recording operation. In the tape speed changing device, in case the temprorary stop or the high speed condition is effected during reproduction, the CTL pulses to be fed from a CTL head 12 are blocked at the time of the stop or high speed condition and the rise time of a servo circuit 14 after the conditions are released, and the pulses of 30 Hz, which are to be reproduced during the normal running condition and which are substantially equal to the CTL pulses, are fed from an oscillator 1 to the automatic change-over circuit 13 and are stored so that they are detected again upon shift to the reproduction.</p> |
