| 摘要 |
PURPOSE:To absrob mechanical fluctuation of magnetic tape running system, by so constituting as to process wow and flutter electrically. CONSTITUTION:The signal of a magnetic reading out head 1 is amplified at a preamplifier 4 and input to a sample holding circuit 6, but it includes wow and flutter due to the tape running system of the magnetic tape 13. The slip of the capstan 16 and the magnetic roller 14 is avoided by the constitution that the slack of magnetic tape 13 is omitted between the capstan 16 and the magnetic head 1. Since the capstan 16 and the magnetic roller 14 are directly coupled, the roller 14 including fluctuation signal is rotated. Since a number of magnetic poles are constituted on the roller 14 and the revolving-speed of the capstan 16 is output at the detection head 15 located closely, the fluctuation component of wow and flutter is output to the speed detector in the form of conversion. With the constitution, mechanical fluctuation can be absorbed. |
