| 摘要 |
A timing recovery system for the lower density longitudinal record channels utilizing capstan velocity or feed forward rate in a magnetic tape recording/reproducing system in which the capstan feed forward velocity, derived from an encoder (20, provides a signal whose frequency is proportional to the speed of the tape (10) driven by the capstan (14). A scaling circuit is provided by means of a frequency-to-voltage converter (40) followed by a voltage-to-frequency converter (44), the output signal providing a demodulation clock having a multiplied frequency proportional to the data rate reproduced from the tape. The demodulation clock, fed to timing window generation circuitry (50), provides an input to data detection circuitry to provide a clocked data output, regardless of the reproduce speed within a very large range of speeds. <IMAGE> |
