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:
Oct. 17, 1989
Filed:
May. 17, 1988
Gerd Eisenberg, Rossdorf, DE;
BTS Broadcast Television Systems GmbH, Darmstadt, DE;
Abstract
To control a reversible element (E), such as a motor and especially a motor operating a tape recorder tape transport, actual operating level input signals in form of timed pulses, depending on speed, and operating sign input signals are applied to a controller (8) through a frequency measuring circuit (5). The controller (8) compares the command level input signal and the actual input signal and provides corresponding error or control output signals. In accordance with the invention, a switch or gate (6) is interposed between the actual operating level input and a frequency measuring circuit (5) which, in turn, controls the controller, the gate or switch being conductive if and only if the sign of the actual operating signal and the sign of the command signal agree, as determined by an antivalence or AND-function gate (7). Upon disagreement of the sign signals, the gate is opened. A transfer switch (10) controlled by the command sign input (3) selectively transfers the output from the controller (8) either directly or through an inverter (11) to the controlled element (E).