摘要:
The amplitude of high level high frequency components of a signal to be recorded on a magnetic recording medium is suppressed in the vicinity of a saturation level of the magnetic recording medium prior to its recording in order to obviate high frequency distortion due to magnetic losses. High fidelity recording of a high level signal containing high frequency components is enabled with little distortion and improved signalto-noise ratio.
摘要:
A magnetic head has a front head portion which is adapted to engage with a rear head portion. The rear head portion consists of a plurality of U-shaped core portions, a shield plate and a holder therefor. The front head portion comprises a stacked arrangement which includes a plurality of core tips and a shield plate therebetween. The stacked arrangement is surrounded by transparent or semitransparent wear resistant members. When the front head portion is engaged to the rear head portion by a rectangular shaped frame through which the front head portion passes, a plurality of closed magnetic paths will be formed by the abutting of each of the U-shaped core portions with a given one of the core tips.
摘要:
Semi-hard magnetic Fe-Mn system alloys, prepared by powder metallurgical methods, are subjected to cold working and subsequent heat treatment to obtain a product of superior magnetic properties and relatively constant magnetic characteristics, as compared to those products prepared by conventional casting methods. The properties of these magnetic alloys render them suitable for use in hysteresis motors, mechanical channel elements employed in electrical communication systems and the like.
摘要:
The speed controller includes a first pulse generator which operates in response to a motor revolution pickup head to produce a sawtooth pulse with the pulse interval being proportional to the speed of the motor and a second pulse generator for producing a series of pulses having a constant time lag relative to a certain preceding one of said sawtooth pulses. The combined pulses produce a control signal pulse series for control of the motor current.
摘要:
The invention relates to a tape reeling mechanism of a video tape recorder, having a rotatable, tape delivery reel support and a rotatable tape wind-up support. The improvements comprises a positioner slide having a substantially triangular opening and arranged between two operation control push buttons, on the one hand, and a drive wheel and idle roller assembly on the other hand, which is pivotably mounted on the panel of the recorder between the reel supports, and a lever pivotably mounted on the panel and having a pin engageable with the opening, the lever being positively held in its neutral position by engagement of the pin with the central apex of the triangular opening.
摘要:
Apparatus for direct-recording and direct-reproducing television video signals in longitudinal tracks on magnetic tape by reversing the polarity of the video signals at intervals at least as long as the horizontal period of the video signal. Gating pulses are generated responsive to the blanking signals for alternately gating the inverted and noninverted video signals.