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:
Apr. 28, 1987
Filed:
Mar. 29, 1985
Arthur C Phelps, Hollywood, CA (US);
High Resolution Television, Inc., Los Angeles, CA (US);
Abstract
An improved color television transmission compatible with NTSC standards produces a controlled horizontal scan rate at about 15,734 Hz with 227.5 cycles of color subcarrier per line, and a controlled vertical scan rate at about 59.940 Hz to produce frames of two interlaced fields each at a rate of about 29.970 Hz with 59,718.5 cycles of the color subcarrier per field, instead of 59,718.75, thereby eliminating 'chroma crawl.' The vertical scan rate is controlled by dividing a clock frequency of four times the color subcarrier by four to produce the color subcarrier, and dividing the clock frequency by some set of multiples to produce the horizontal and vertical scan rates with 227.5 cycles of color subcarrier per line and 59,718.75 cycles per field, and once every field, at the end thereof, skipping one cycle of the clock frequency in the generation of the horizontal and field sync pulses for the next field, thereby causing each field to have 59.718.5 cycles of the color subcarrier instead of the 59,718.75 cycles otherwise provided.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile