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. 12, 1991
Filed:
Nov. 15, 1989
Applicant:
Inventor:
Tzafrir Sheffer, Seattle, WA (US);
Assignee:
John Fluke Mfg. Co., Inc., Everett, WA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03C / ; H03B / ;
U.S. Cl.
CPC ...
328 14 ; 307529 ; 332149 ; 364718 ;
Abstract
Arrangements are provided for generation of dual-tone waveforms utilizing direct digital waveform synthesis techniques and architecture and retaining the advantageous characteristics of direct digital waveform synthesis. Preferred embodiments feature combination of generated waveforms at an analog adder, a digital adder using a single digital-to-analog converter and at a single wave table, respectively, each providing particular hardware economies and operational advantages with respect to other preferred embodiments.