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:
Sep. 12, 1989
Filed:
Jan. 20, 1987
Walter F Bain, Lovettsville, VA (US);
The Analytic Sciences Corporation, McLean, VA (US);
Abstract
Periodic components of a data signal are generated from a periodic original signal in a manner to cause the periodic components to represent not only the data but also information about characteristics of the original signal; subsequently both the data and the information about the original signal characteristics are derived from the periodic components. The periodic components of a data signal are generated at frequencies within a frequency band and in a manner such that the components precisely define a fixed frequency outside the spectral band. Unauthorized access to a device (of the kind that receives data in the form of a data signal having periodic components) is detected by generating the periodic components using a modulation scheme, involving no encryption, whereby the data may be recovered from the data signal directly by demodulation even by an unauthorized party; imparting inherent authentication information to the periodic components; and permitting authorized access and detecting unauthorized access on the basis of the inherent authentication information.