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. 15, 1978
Filed:
Mar. 22, 1977
Joseph Reed, Stamford, CT (US);
International Telephone & Telegraph Corp., Nutley, NJ (US);
Abstract
An FDM communication system is disclosed wherein two separate intermediate frequencies are utilized in such manner that the difference between transmitting and receiving frequencies thus generated is the difference between the two separate intermediate frequencies, thereby providing the capability of using independent sideband transmission instead of single sideband transmission, thus providing additional channel capacity. A single synthesizer is utilized and a single bandpass filter selects the appropriate upper or lower sidebands of transmission for full duplex operation. One of the two available sidebands is then used for communication, with the other sideband available for signalling, monitoring, break-in or other telecommunication functions.