Abstract: A magnetic data storage system includes a storage medium wherein bits of data are stored by perpendicular recording with a density sufficiently high to provide for the simultaneous presence of more than one data bit beneath the magnetic sensing element of a read head. A relative motion is imparted between the head and the medium during playback of data, and the sensed magnetic field changes produce sensor signals. The sensor signals are delayed by one or more delay elements providing delay times which differ from each other by one increment of delay, such delay increment being equal to the amount of time elapsed by a stored data bit passing a point on the pole piece of the read head. By summing together the respective delayed signals, cancellation of the spurious response is obtained so that the stored data can be retrieved.

Abstract: A hybrid read/write head for use with a perpendicular recording medium is a laminate of prefabricated members having thin film magnetic layers as the read/write and tunnel erase pole tips.

Abstract: A system for recording audio and video signals on magnetic and other media including a generator of a time-reference square-wave signal, a circuit for combining the dc level with an input audio or video signal, and a sampling circuit wherein the sum of the input signal and the dc level are sampled in synchronism with the square-wave signal. The time-reference signal and a second signal, delayed therefrom, are then recorded by saturation of the magnetic medium in both positive and negative directions. The amount of delay between the two recorded signals is proportional to the amplitudes of the successive samples of the sampling circuit. After playback, the original input signal is retrieved from the recorded signals by comparing successive samples with a succession of ramp waveforms and filtering out the sampling spectrum and the dc level.

Abstract: A layer of urethane or silicone elastomer is interposed between a plastic film undergoing sputter deposition and a support for the film to avoid thermal damage to the film.

Abstract: An arrangement for recording an analog signal onto magnetic tape in which the analog signal modulates a square wave bias field by moving the negative-going transition of the square wave so that the average of the positive portion and negative portion of the square wave, equals the instantaneous value of the analog signal. The period of the total square wave, is maintained constant. The analog signal is compared to a periodic triangular-shaped wave, in a comparator, and the output of the comparator becomes switched in polarity whenever the analog modulating signal is equal in value to the instantaneous value of the triangular wave. The point at which polarity is switched corresponds to an intersection of the analog signal superimposed on the triangular wave. The resultant modulated square wave is applied to a recording head.