The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1978
Filed:
Sep. 01, 1976
Clement W Munninghoff, Cincinnati, OH (US);
Cincinnati Electronics Corporation, Cincinnati, OH (US);
Abstract
Clock and binary NRZ signals are derived from a data track of a magnetic tape. The data track includes a pattern having a substantially constant wave length of magnetic flux variations along its length. The variations are in the form of a carrier wave having only three predetermined envelope levels. One of the levels is provided for clock pulses and the other two levels are provided for the magnitudes of the binary NRZ signals. A replica of the variations is transduced by a head into an electrical signal. First and second signals are derived in response to the electric signal to respectively indicate the carrier wave having amplitudes above first and second values of the levels. The first level is greater than the level of one of the binary signals, while the second level is greater than the first level and the level of the clock pulses. In response to the first and second signals, flip-flop circuitry derives an NRZ signal, and the clock signal is derived in response to a predetermined common level for the first and second signals. The medium is susceptible to being driven at different speed ranges, and to this end, a signal indicative of a tape speed range is derived. Retriggerable one shots are selectively enabled, depending upon the speed range. The one shots which are enabled have time periods such that they are retriggered by the first and second signals while the medium is moving in a speed range associated with enablement of the particular retriggerable one shots.