System for the reproduction of signals stored on a magnetic tape

Claim 1

A system for the reproduction of signals stored on parallel tracks adjacent to one another and running diagonally to the longitudinal axis of the magnetic tape on which they are stored, with a drum-shaped scanning device round whose outer surface the magnetic tape is wound spirally within a predetermined angular range and which, for the purpose of scanning the tracks successively and reproducing the signals stored on them, comprises at least two magnetic heads which can be driven with a rotary movement, of which magnetic heads only one is at any time in scanning contact with the magnetic tape in cyclically successive first scanning intervals and both of whch are simultaneously in scanning contact with the magnetic tape in second scanning intervals and which are mounted on electromechanical adjustment devices with which, for their guidance over the tracks to be scanned, the magnetic heads are adjustable transversely in relation to the tracks in response to adjustment signals applied to the adjustment devices, for the generation of which signals an adjustment-signal generating circuit is provided, to which circuit, via a first switching device controlled by a control-signal generator, the signals reproduced by the magnetic heads and containing a measurement of the deviations of the magnetic heads from the track are to be applied alternately for the purpose of generating signals corresponding to the adjustment signals for the adjustment devices and which circuit incorporates the storage circuits connected at the inputs to the adjustment devices, to which storage circuits, via a second switching device controlled by the control-signal generator in a similar manner to the first switching device, the signals corresponding to the adjustment signals can be led alternately and which keep these signals for generation of the adjustment signals stored, the control-signal generator activating in the first scanning intervals the first switching device so as to pass th signals reproduced by the particular magnetic head in scanning contact on to the adjustment-signal generating circuit, and the second switching device so as to pass the signals corresponding to the adjustment signals for the adjustment device carrying the particular magnetic head in scanning contact on to th storage circuit connected at the input to this adjustment circuit, IN WHICH, during the second scanning intervals, the control-signal generator activates the first and second switching devices so as to pass at least once on an alternate time-division multiplex basis the signals reproduced by the two magnetic heads simultaneously in scanning contact on to the adjustment-signal generating circuit and the signals corresponding to the adjustment signals for the adjustment devices carrying the two magnetic heads simultaneously in scanning contact on to the storage circuits connected at the inputs to these adjustment devices.

Claim 2

A system for the reproduction of signals stored on parallel tracks adjacent to one another and running diagonally to the longitudinal axis of the magnetic tape on which they are stored, with a drum-shaped scanning device round whose outer surface the magnetic tape is wound spirally within a predetermined angular range and which, for the purpose of scanning the tracks successively and reproducing the signals stored on them, comprises at least two magnetic heads which can be driven with a rotary movement, of which magnetic heads only one is at any time in scanning contact with the magnetic tape in cyclically successive first scanning intervals and both of whch are simultaneously in scanning contact with the magnetic tape in second scanning intervals and which are mounted on electromechanical adjustment devices with which, for their guidance over the tracks to be scanned, the magnetic heads are adjustable transversely in relation to the tracks in response to adjustment signals applied to the adjustment devices, for the generation of which signals an adjustment-signal generating circuit is provided, to which circuit, via a first switching device controlled by a control-signal generator, the signals reproduced by the magnetic heads and containing a measurement of the deviations of the magnetic heads from the track are to be applied alternately for the purpose of generating signals corresponding to the adjustment signals for the adjustment devices and which circuit incorporates the storage circuits connected at the inputs to the adjustment devices, to which storage circuits, via a second switching device controlled by the control-signal generator in a similar manner to the first switching device, the signals corresponding to the adjustment signals can be led alternately and which keep these signals for generation of the adjustment signals stored, the control-signal generator activating in the first scanning intervals the first switching device so as to pass th signals reproduced by the particular magnetic head in scanning contact on to the adjustment-signal generating circuit, and the second switching device so as to pass the signals corresponding to the adjustment signals for the adjustment device carrying the particular magnetic head in scanning contact on to th storage circuit connected at the input to this adjustment circuit, IN WHICH, during the second scanning intervals, the control-signal generator activates the first and second switching devices so as to pass at least once on an alternate time-division multiplex basis the signals reproduced by the two magnetic heads simultaneously in scanning contact on to the adjustment-signal generating circuit and the signals corresponding to the adjustment signals for the adjustment devices carrying the two magnetic heads simultaneously in scanning contact on to the storage circuits connected at the inputs to these adjustment devices.