Patent
1973-06-11
1976-06-08
Griffin, Robert L.
325427, H04B 700
Patent
active
039626393
ABSTRACT:
A modulated communication system having radio frequency bandwidth reduction in which level sensing circuits at the transmitter control the modulations such that information signals up to a predetermined and selected percent of the modulation level commonly used are transmitted as before, and information signals above that percentage are reduced so that they also begin at the zero amplitude level. That is, once the preselected threshold percentage is reached the signal level is reduced by that threshold amount so that, although all the information in the signal is retained, the signal level is prevented from being greater than the predetermined and selected threshold percentage. At the receiver, the rapid transistions of the transmitted signal between maximum and zero are responded to by a circuit which switches between its low level and high level to reverse the reduction of the high level signals at the transmitter. The present invention is applicable to both amplitude and frequency modulation systems.
REFERENCES:
patent: 3339142 (1967-08-01), Varsos
patent: 3378770 (1968-04-01), Daguet
patent: 3538246 (1968-05-01), Macovski et al.
"Communication Systems, An Introduction to Signals and Noise in Electrical ommunications", Carlson, McGraw-Hill, c 1968, pp. 239-242.
Adams Robert W.
Griffin Robert L.
Miller Roy
Psitos Aristotelis M.
Sciascia R. S.
LandOfFree
System for reducing radio communication frequency bandwidth and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for reducing radio communication frequency bandwidth and , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for reducing radio communication frequency bandwidth and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1102591