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. 02, 1987
Filed:
Apr. 26, 1984
Charles E Ricciardi, Swampscott, MA (US);
QSI Systems, Inc., Woburn, MA (US);
Abstract
Several cameras (12, 14, 16) have their composite-video outputs sent to a common switcher (24), which picks one of the outputs and sends it to a modulator (26) to be placed on a carrier and sent by antenna (28) to a central broadcast station. A central timing circuit or driver (30) sends master signals to signal-generating circuits (34, 36, 38), which receive the outputs of the cameras (12, 14, 16) and automatically adjust their output timing so that their synchronization signals are received in synchronism at the switcher (24). Timing comparators (62, 88) compare the timing of sync and subcarrier signals in the camera output with similar signals from the driver and in response control voltage-controlled oscillators (78, 104) that provide timing for the sync signals and color-burst signals that are sent to the cameras. By advancing or retarding the timing of the voltage-controlled oscillators in accordance with the relative leads or lags between the driver signals and the camera signals, the signal-generator circuits (34, 36, 38) keep the camera outputs at the switcher input ports in synchronism.