Abstract:
A signal address system is adapted for use with apparatus for magnetically recording and reproducing a signal on a rotary member. At least one magnetic head is provided for recording and reproducing a video signal on a rotating magnetic member. The head is moved by drive pulses associated with field signals or frame signals of the video signal. Thus, the number of drive pulses may be used to provide an output signal representing the total number of drive pulses, which is substantially equivalent to an address signal. Thus, an address may be called out without requiring the recording and reproduction of a specific address signal on the magnetic medium.
Abstract:
A recording and reproducing time indicator in a magnetic recording and reproducing apparatus which makes magnetic recording and reproduction by linear movement of magnetic heads in contact with a rotary magnetic medium. The indicator comprises a time indication part having a scale showing the position of magnetic heads into time, a pointer for indicating a scale on said time indication part, and a pointer driving means for moving said pointer in response to the position of magnetic heads moved by the head moving means.
Abstract:
A digital rotation or stepping motor contains oil of suitable viscosity which fills the space between a rotor and a stator. The motor is digitally and intermittently stepped in response to input pulses. The viscosity of the oil is selected to prevent a hunting which might otherwise be produced when the rotor stops its intermittent rotation.
Abstract:
A system for detecting an error in the step-by-step movements of magnetic heads for a recording and reproducing apparatus using a rotary magnetic medium. A plurality of magnetic heads are alternately moved intermittently in a predetermined cycle over the rotary magnetic medium, from its marginal portion to its central portion and return, for example. The recording or reproducing is a continuous video signal recorded on a number of concentric circular tracks. The magnetic heads are moved in stepby-step motion. The recording magnetic head remains stationary over the rotating medium, each field or each frame of the video signal being recorded in one of the circular tracks. The inventive system enables a ready detection, and it indicates and corrects an error in the step-by-step movements of the magnetic heads.
Abstract:
This is a system for magnetically recording and playing back video signals on a rotating disc-shaped or drum-shaped magnetic medium. A plurality of magnetic heads move alternately and intermittently in a predetermined cycle. The invention permits detection of feed initiation positions, feed completion positions, feed burst positions and feed reset positions of the magnetic heads.