| 摘要 |
1,029,833. Recording and playback. SEISMOGRAPH SERVICE (ENGLAND) Ltd. May 8, 1962 [May 8, 1961], No. 16687/61. Heading G5R. [Also in Division G1] A correlation detection system employs magnetic transducers of extended length with a sensitivity pattern along the length which represents one of the variables. One of the variables is recorded on to a magnetic tape which is moved past a head bearing a zig-zag conductive line, the line being formed in conformity with the other variable by, for example, printed circuit technique, with tapping points along its length, Fig. 2 (not shown). The tape may be driven by a servo controlled speed correction system with a time track recorded on the tape by conventional means. In one arrangement, Fig. 3 (not shown), the line is formed by moving a sheet of foil 23 beneath a pair of motor-driven styli 22 which are spaced apart by about ¢ mm. A high voltage applied between styli 22 and foil 23 vaporizes the metal along lines 26 leaving a strip 27. Alternatively, a wound head may be provided, Fig. 7 (not shown). |
