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. 18, 1979
Filed:
Dec. 01, 1977
William C Gilbert, Greenfield, IN (US);
Other;
Abstract
An audio signal to color pattern display signal converter-modulator includes an input audio signal section, four frequency band filters, horizontal sync and sweep circuitry, vertical sync and sweep circuitry, a pulse width modulator section, a level converter-modulator matrix, a chroma encoder circuit section and a chroma and luminance modulator and video output circuit section. The pulse width modulator section includes a CMOS NAND gate associated with each of the four frequency band filters, each NAND gate and each filter combination corresponding to a different primary display color. Each NAND gate has one input coupled to an output voltage signal from its corresponding filter section and the other NAND gate input is coupled to a sine wave signal. There are four such sine wave signals each sequentially phase shifted by 90.degree. from the preceding adjacent sine wave. The resulting pattern, which is displayed on a television receiver, is a vertical stack of four elliptical areas (when all four NAND gates are turned on) each area being of a different color. As the particular audio signal within each frequency band increases and decreases in amplitude, the corresponding elliptical area increases and decreases about a center point causing adjacent elliptical areas to overlap thereby creating color blending.