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. 15, 1987
Filed:
Oct. 17, 1986
Richard J Wiegand, Severna Park, MD (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A digital radio frequency memory (DRFM) system for storing and retrieving radio frequency signals in a digital memory. The system includes a digital memory, digital converters at the input and output of the digital memory, and input and output mixers. The RF signal to be stored is applied to the input mixer along with a modulated local oscillator signal to produce an IF signal which is converted into digital values for storage in the digital memory. When the stored digital values are retrieved from the memory to reproduce the RF signal, they are converted back into an analog IF signal which passes through a low-pass filter before being applied to the output mixer. The local oscillator signal, modulated with the same waveform used in storing the digital values, is also applied to the output mixer to provide the reconstructed RF signal. A pseudo random, discrete digital valued waveform is used to phase modulate the local oscillator signal in the preferred embodiment of the invention. This arrangement permits spur free, image free reproduction of RF signals over a large bandwidth.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile