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:
Dec. 08, 1987
Filed:
Mar. 26, 1986
Thomas G Schnerk, Rancho Palos Verdes, CA (US);
TRW Inc., Redondo Beach, CA (US);
Abstract
A method and apparatus for modulating and demodulating a digitized stereo audio signal with a 3-level, partial response waveform. The 3-level, partial response waveform utilizes 3-level coded pulses rather than conventional on-off or 2-level coded pulses. This results in a bandwidth reduction of approximately 50% over the conventional 2-level coded pulses and allows the stereo audio signal to be transmitted within the bandwidth limitations of conventional television transmission systems, without first compressing or reducing the sampling rate of the stereo audio signal. For transmission over statellite-based systems, the modulated stereo audio signal is digitally up-converted to a 6.6 MHz quadrature subcarrier. For transmission over ground-based systems, the modulated audio signal is multiplexed into the video signal during the video horizontal blanking interval.