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:
Jan. 15, 1991
Filed:
Sep. 12, 1989
Michael E Long, Oak Brook, IL (US);
Peter Stramello, Arlington Heights, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A TV decoder low loss switching system includes relay operated switch contacts for directly connecting an input signal without loss to a decoder tuner in the normal or enabled mode or bypassing the input signal to a TV in the bypass mode. The switch is parallelled by an impedance to permit a small amount signal singal to be applied to the tuner (in the bypass mode) for data purposes. In one embodiment, a second set of simultaneously actuated contacts connects the output of the decoder to the output terminal. In another embodiment, a channel 3/4 modulator is supplied by the decoder and its output connected via a PIN diode to the output terminal. The PIN diode is biased into conduction by actuation of a transistor switch responsive to the microprocessor enabling the decoder. The conduction of the PIN diode permits the channel 3/4 modulator signal to pass to the output terminal.