Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1984-02-15
1985-04-02
LaRoche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329107, 329110, 329123, 329137, 375 80, 375 83, 375 94, 375 97, 455214, 455209, H03D 300, H04L 2722
Patent
active
045090173
ABSTRACT:
A method and apparatus for phase modulating a carrier signal to convey an information signal (12) such that the carrier signal has a constant amplitude envelope. A Hilbert transform signal (14) of the information signal (12) is produced. The signals (12, 14) are sampled to produce signals (16, 18), which represent cartesian coordinate values. The cartesian coordinate values are then converted into equivalent polar vectors (20-36) which have both an amplitude (R) and an angle (.theta.). The polar vector quantity (R, .theta.) is converted into two unity amplitude vectors (A, B). The unity amplitude vectors (A, B) are offset from the polar vector quantity by an angle the cosine of which is proportional to the amplitude of the polar vector (R). The carrier signal is sequentially phase modulated phase angles of the unity amplitude vectors (A, B) for each sample period of the information signal. This modulation procedure maintains a constant amplitude envelope for the carrier signal and makes possible simultaneous demodulation of a plurality of carrier signals in a single demodulation channel.
REFERENCES:
patent: 3971999 (1976-07-01), Bilsens et al.
patent: 4320499 (1982-03-01), Muilwijk et al.
patent: 4324952 (1982-04-01), Smiley
patent: 4354277 (1982-10-01), Crackel et al.
patent: 4361728 (1982-11-01), Tanabe
patent: 4367542 (1983-01-01), DuBroff
Andren Carl F.
Mosley, Jr. William H.
Sanders David E.
Crowder, Jr. Albert M.
E-Systems Inc.
LaRoche Eugene R.
Paxman W. R.
LandOfFree
Method and apparatus for pulse angle modulation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for pulse angle modulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for pulse angle modulation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1092992