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:
Aug. 07, 1979
Filed:
Dec. 07, 1977
David W Wax, Seattle, WA (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
Apparatus and a method are disclosed for detecting a tone pulse of known carrier frequency having a carrier phase reversal at a predetermined time by correlating a clipped version of the tone pulse signal with each of quadrature related components of a rectangular wave reference signal. Correlation is accomplished by multiplying the clipped signal with the reference signal components and sampling the two resultant product signals. Samples of each product signal are shifted through a delay register having sufficient capacity to contain samples corresponding to a complete pulse, and having an intermediate tap arranged to correspond with the timing of the phase reversal. Concurrent input and output samples of each delay register and an inverted and doubled version of the signal at its intermediate tap are combined and integrated to provide a pair of correlation signals which are rectified and summed to produce an autocorrelation signal.