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:
Jun. 21, 1988
Filed:
Jul. 08, 1985
Bar-Giora Goldberg, San Diego, CA (US);
Sciteq Electronics, Inc., San Diego, CA (US);
Abstract
N stages of BCD adders receive as a first addend BCD encoded information representing a desired frequency. They receive as a second addend the outputs of N stages of four-bit registers. The summing outputs of the adders are input data for the registers. The data is clocked into the register by a stable frequency source. The outputs from a plurality of the most significant stages of the registers are used to address a ROM. Using the periodically changing BCD address, a sinusoidal function is retrieved in individual samples from the ROM. Digital data from the ROM is converted to analog. A low pass filter enhances the desired frequency and suitably attenuates higher frequencies. An equalizer compensates for power roll-off.