Telecommunications – Receiver or analog modulated signal frequency converter – Suppressed carrier
Patent
1978-06-26
1980-12-23
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Suppressed carrier
329145, 455 46, H04B 126
Patent
active
042414512
ABSTRACT:
A single sideband signal can be demodulated by using sampled data techniques. An intermediate frequency (IF) radio signal is split into two branches and is sampled by two sample and hold devices; each sample and hold device operates at a rate that is not only a submultiple of the carrier frequency, but is also at least twice the information bandwidth. Prior to, or during sampling of one branch (the quadrature branch), a Hilbert's transform is performed upon the IF signal which results in the output of the two sample and hold devices being in phase quadrature. A phase shift of 90.degree., using a baseband finite impulse response Hilbert's transform filter, is performed upon the output signal of the quadrature branch's sample and hold device. The sum of the inphase sampled signal and the filtered quadrature phase sampled signal produces the demodulated lower sideband while the difference between the two produces the demodulated upper sideband. There are two basic examples shown of single sideband demodulation through the use of sampled data techniques; in addition, there are several examples of implementing the Hilbert's Transformer.
REFERENCES:
patent: 3863174 (1975-01-01), Klinger
patent: 4035732 (1977-07-01), Lohrmann
patent: 4057762 (1979-11-01), Namiki
Pappenfus et al., "SSB Principles and Circuits"; McGraw-Hill Co. 1964, pp. 305-307.
Turin, "An Introduction to Digital Filters"; Proc; of IEEE, vol. 64, No. 7, Jul. 1976, pp. 1092-1097.
McBride, "On Optimum Sampled Data FM Demodulation"; IEEE; Transactions on Communications, vol. Com-21 No. 1, Jan. 1973, pp. 40-50.
Taub et al., "Principles of Communication Systems", McGraw-Hill Co. 1971, p. 161.
Bjerede et al., "Digital Processing Receiver", bulletin AD-A008 522-National-Technical Information Service, Dept. of Commerce.
Maixner Richard C.
Marston Robert K.
Massad Khalil E.
Bookbinder Marc E.
Greenberg Howard R.
Hamann H. Frederick
Robinson Richard K.
Rockwell International Corporation
LandOfFree
Single sideband signal demodulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Single sideband signal demodulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single sideband signal demodulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2246615