| 摘要 |
954,942. Magnetic data storage apparatus. POTTER INSTRUMENT CO.Inc. Dec. 21,1961 [Feb. 1, 1961], No. 45865/61. Heading G4C. A method of and apparatus for recording binary digital data on a magnetic medium in which clock pulses determine cell boundaries and a first binary digit is represented by a reversal of the magnetisation state within a cell whereas the other binary digit is represented by no such reversal is characterized in that instead of the data representing reversal occurring when 50% of the cell interval has elapsed, Fig. 1A, the reversal occurs when 30% of the cell interval has elapsed, Fig. 1C. A gate for gating the 30% time pulse is opened from 10% time to 60% time, Fig. 1D. The method described is effective to reduce the probability of error signals due to fluctuation in the speed of the recording medium. Suitable reading and recording circuits are described (Figs. 2, 3, not shown). Reference has been directed by the Comptroller to Specification 792,294. |
