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Program Generated Recording

IP.com Disclosure Number: IPCOM000075786D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Edstrom, GH: AUTHOR [+4]

Abstract

A microprogram alters or generates signals to be recorded for simulating dead-tracking, writing reference codes, modulating data signals, and the like. 1/0 channel 10 supplies data and control signals to both signal processing circuits 11 and microprocessor 12. Processor 12 controls the control unit aspects of the signal processing by circuits 11. The outputs of signal processing circuits 11 and microprocessor 12 are OR'd together in diode OR circuit 13, before being supplied to recording head 14 to record signals on media 15. In this manner, the microprocessor can generate a programmed mask or generate its own signals to be recorded and be merged with the signals produced by processing circuits 11.

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Program Generated Recording

A microprogram alters or generates signals to be recorded for simulating dead-tracking, writing reference codes, modulating data signals, and the like. 1/0 channel 10 supplies data and control signals to both signal processing circuits 11 and microprocessor 12. Processor 12 controls the control unit aspects of the signal processing by circuits 11. The outputs of signal processing circuits 11 and microprocessor 12 are OR'd together in diode OR circuit 13, before being supplied to recording head 14 to record signals on media 15. In this manner, the microprocessor can generate a programmed mask or generate its own signals to be recorded and be merged with the signals produced by processing circuits 11.

For understanding the masking operations, reference to OR circuit 13 is first made. Inputs A and B, respectively from circuits 11 and processor 12, are applied to diodes 20 and 21. The cathodes of these diodes are joined to OR circuit resistor 22 forming an output. If processor 12 is supplying a continuing positive voltage to diode 21, and with circuits 11 capable of only supplying the same maximum amplitude, diode 20 remains nonconductive to block all of the signals produced in circuits 11. In the alternative, processor 11 may be supplying a continuous relatively negative voltage thereby enabling diode 20 to pass circuits 11 signals.

Applications of this combination are manyfold. In diagnostic procedures, for example, dead-tracking capabilities can be tested. In a nine-track magnetic tape system, microprocessor 12 is programmed to select any one of the nine tracks, then supply a diode blocking signal for that trac...