Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-06-29
1991-11-12
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358177, 358160, H04N 5213
Patent
active
050652427
ABSTRACT:
Deghosting apparatus for eliminating multipath signal components in a received transmitted television signal incorporates a training signal which is a finite duration sequence of repetitions of a 2.sup.n -1 psuedorandom sequence. The 2.sup.n -1 pseudorandom sequences are mapped into 2.sup.r sample intervals at either the transmitter or the receiver to facilitate fast Fourier transform processing. Power spectra of the received and mapped training signal and a stored version of the training signal are deconvolved with the deconvolution coefficients produced in logarithmic form. The logarithms are inverse Fourier transformed to produce delay coefficients related to the time of occurrence of the multipath signals, which coefficients are utilized to program variable delay circuitry in an adaptive filter to cancel the multipath components.
REFERENCES:
patent: 4374400 (1983-02-01), Holmes
patent: 4476491 (1984-10-01), Murata et al.
patent: 4502077 (1985-02-01), Morotomi et al.
patent: 4578544 (1986-03-01), de Verdiere et al.
patent: 4594479 (1986-06-01), Farrow et al.
patent: 4686570 (1987-08-01), Lewis, Jr. et al.
patent: 4727424 (1988-02-01), Chao
patent: 4864403 (1989-09-01), Chao et al.
patent: 4896213 (1990-01-01), Kobo et al.
patent: 4897725 (1990-01-01), Tanaka et al.
patent: 4914507 (1990-04-01), Smith et al.
"A Tutorial on Ghost Cancelling in Television Systems", by W. Ciciora et al., IEEE Transactions on Consumer Electronics, vol. CE-25, Feb. 1979, pp. 9-44.
"Digital Signal Processing", by A. V. Oppenheim et al., Prentice-Hall, Inc., pp. 491-529.
Dieterich Charles B.
Greenberg Arthur L.
Chin Tommy P.
General Electric Company
Hayes James B.
Herrmann Eric P.
Ho Tuan V.
LandOfFree
Deghosting apparatus using pseudorandom sequences does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Deghosting apparatus using pseudorandom sequences, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deghosting apparatus using pseudorandom sequences will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1016390