Abstract: The specification discloses means for correcting timing variations present in a data stream emanating from a data storage device such as a magnetic tape drive or the like before the data stream is applied to the data separator or other such input device of a computer. This is accomplished by remodulating the time-varying bits in the data stream in a manner which reduces or eliminates the undesired timing variations. Basically, the system utilizes frequency-modulation techniques to in effect remodulate the raw data stream. The application discloses, as one preferred embodiment, a pulse-width modulator which receives the error signal output of a phase-locked loop network, the input of the pulse-width modulator being coupled to the incoming raw data stream.

Abstract: A magnetic core structure for a "read-write" transducer head of the type known as a "wide-write, narrow-read" head, having at least one magnetic gap, wherein the magnetic pole structure performing one of the transducing functions (e.g. the "write" function) is in effect wider than that performing the other (e.g. the "read") function. At least one such magnetic pole has a laminar structure comprising at least one medial layer or strata and at least one flanking layer or strata which is disposed adjacent to and overlying at least portions of the medial strata, to thereby define an included area of overlap therebetween. The thickness of the medial strata, measured along the length of the gap, is less than that of the magnetic core structure on the opposing side of the gap.

Abstract: A magnetic core structure for a "read-write" transducer head of the type known as a "wide-write, narrow-read" head, having at least one magnetic gap, wherein the magnetic pole structure performing one of the transducing functions (e.g. the "write"function) is in effect wider than that performing the other (e.g. the "read") function. At least one such magnetic pole has a laminar structure comprising at least one medial layer or strata and at least one flanking layer or strata which is disposed adjacent to and overlying at least portions of the medial strata, to thereby define an included area of overlap therebetween. The thickness of the medial strata, measured along the length of the gap, is less than that of the magnetic core structure on the opposing side of the gap.

Abstract: A miniaturized tape cartridge drive for data processors in accordance with the invention has as peripherally-enclosing main frame providing an access opening for insertion to a tape cartridge and structurally mounting flat, pancake-type drive motors for tape transport and head-positioning translation laterally with respect to the tape, for accessing any of a plurality of adjacent recording tracks on the tape, such motors being disposed in tandem with respect to the cartridge-admitting opening and having their output shafts pointing in opposite directions. The head-positioning motor drives a directly-coupled rotary cam, and a positioning arm extends between the cam and the transducer head to move the head in response to movement of the cam. The positioning arm is pivotally journaled in opposite sides of the main frame upon a transverse pivot axis disposed medially of the arm, such that the arm operates as a fulcrumed lever.