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:
Aug. 20, 1985
Filed:
Jun. 20, 1983
Applicant:
Inventors:
Sydney J Reid, Jr, Tempe, AZ (US);
Fredrick Zlotnick, Scottsdale, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
358197 ; 358 86 ; 3581941 ;
Abstract
A volume control circuit useful for remotely controlling volume through a CATV remote control unit uses a sound carrier demodulator to obtain an intercarrier sound signal. The intercarrier sound signal is further demodulated to obtain a detected audio signal whose amplitude can then be easily controlled by an amplifier. The gain of the amplifier can then be controlled from the remote unit. The detected audio is then remodulated with the RF video carrier. The remodulated audio is then summed with the video signal to provide an RF output signal having amplitude controlled audio.