A method for adding alloying material to a molten metal media, such as molten aluminum, is disclosed. The method includes converting the alloying material into a spray of superheated alloy material and directing the spray into the molten metal media at a depth below the media's surface to enhance dissolution and dispersion of the alloying material in the molten media.

The disclosed information signal recording and/or reproducing apparatus records or reproduces an information signal by shifting two electric-to-mechanical conversion elements which respectively have heads mounted thereon. Each electric-to-mechanical conversion element has a residual displacement characteristic. The shift direction of one conversion element is arranged to be the same as that of the other immediately before switchover from a first mode to a second mode. In the first mode, the diff...

A video signal reproducing apparatus for high-speed playback comprises a fixed head mounted on a rotary head drum, and a movable head supported on the head drum so as to lag the fixed head by a predetermined phase, and mounted on a bimorph plate so that the position of the movable head can be controlled transversely of a skew track on a magnetic tape. A delay circuit matches the phases of the signals reproduced by the fixed and movable heads, and in dependence on the levels of the reproduced sig...

A tracking-error correcting system in a rotary head magnetic recording and reproducing apparatus in which the reproducing magnetic heads can move in the direction of their axis of rotation by using a bi-morph leaf having piezoelectric elements. This system can automatically detect the tracking-error between the reproducing head and a recorded track, and move the reproducing head in a direction to attain better tracking position while the head is not in contact with the magnetic tape, so that eit...

Rotatable head support (6) carries at least one magnetic head (7) which scans the tracks of a magnetic tape (1) guided across an arcuate guide surface (5) over an angle smaller than 180.degree.. The angle of inclination (.alpha.) of a head relative to a reference plane (100) is adjustable by a rack (13) and a pinion (15) to enable the tracks (26) to be followed at tape speeds (n.multidot.V.sub.0) which vary relative to a nominal tape speed (V.sub.0). Tape speed detection means (22) derive a cont...

The present invention provides a simple apparatus for modifying at will the trajectory of heads in a rotating head magnetic recorder (for example, when the playback speed is changed) without introducing any active elements in the moving parts. Fixed electromagnets, controlled by a position sensor, control pendulum movements of the heads oscillating under centrifugal force due to their rotation.

A still/slow circuit for use in a two-head type VCR includes a digital counter for counting slow indication signals, a pulse oscillator for outputting slow drive control signals in response to outputs of the digital counter, an envelope detector for integrating playback video signals to detect envelopes therefrom, a differentiator for differentiating head-switching signals to output only positive pulse signals, a sample/hold unit for sampling and holding the output signals of the envelope detect...

A tracking-error correcting system in a rotary head magnetic recording and reproducing apparatus in which reproducing magnetic heads are mounted on a respective bimorph leaf having piezoelectric elements so as to be movable in the direction of the axis of rotation. The piezoelectric elements are controlled by a control voltage which is produced by adding a signal from an auto-tracking circuit and a signal from a triangular wave generating circuit. In a reproducing mode at a tape speed which is d...

A servo loop for an automatic scan tracking arrangement for a helical-scan videotape playback machine includes a wideband relatively low-gain portion for fast acquisition and correction of mistracking errors. In order to provide high gain for reducing mistracking which recurs from scan to scan, a second path in the servo loop in parallel with the wideband path includes a commutating filter which accumulates the average error signal generated by the wideband system in a commutating filter and rei...

A dither-controlled automatic scan tracking system for television signal playback includes a field-store memory for storing a scan track control signal related to the average amplitude-tune "shape" of the transducer deflection control signal. The memorized scan track signal is added to a wideband scan track feedback signal to produce a composite signal which improves tracking error. Anomalous errors can result from memorizing signals which are systematic but unrelated to transducer or head defle...