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:
Nov. 28, 1978
Filed:
Jul. 21, 1977
James A Stewart, Menlo Park, CA (US);
GTE Automatic Electric Laboratories, Incorporated, Northlake, IL (US);
Abstract
In the transmit circuits of one terminal, a high frequency (HF) sinusoidal carrier signal of frequency f.sub.c is combined with a low frequency (LF) pulse signal having a PRF f.sub.p to produce a pulsed carrier signal having a plurality of component frequencies af.sub.c .+-. bf.sub.p. The pulsed carrier is modulated in each voice channel by an associated voice signal to produce sidebands of the HF component frequencies there. A different sideband is selected at HF for each channel by polylithic crystal bandpass filter. The selected HF sidebands are then combined with the carrier signal to translate them to low frequencies for subsequent transmission.