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:
Feb. 23, 1982
Filed:
Oct. 27, 1980
William R Wray, Sudbury, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A recorder for the recording and the playback of analog information on a movable magnetic medium, e.g. a magnetic tape, has a limiter for reducing the gain of the record section in response to excessive input amplitudes, has a playback section that cancels noise which the transducer unit picks up, and has a muting circuit that diminishes playback gain during certain operations. The recorder applies the limiting function to the compressor portion of a dynamic compandor and applies the muting control to the expandor portion of the compandor. The noise cancellation introduces a relative phase reversal to noise present with different playback signals, and sums selected portions of those signals to cancel the noise.