Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-12-24
1987-10-27
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358187, 375 15, H04N 514, H04N 538
Patent
active
047033576
ABSTRACT:
An adaptive television deghosting system operates on modulated video signals including a direct signal component and one or more ghost signal components. The system uses synchronously demodulated in-phase and quadrature-phase baseband video signals as the respective real and imaginary input signals to a complex IIR filter. The filter coefficients are developed adaptively from preset initial values using the signals provided by the filter during a training interval. The training interval includes the interval between the leading edge of the vertical sync pulse and the first serration pulse of each field. The filtered training signals are subtracted from a sync-tip reference value to develop a signal which is proportional to the error in the filter coefficient values. The error signal values corresponding to ghost signals are multiplied by the complex conjugate of the training signal values which represent the analogous sampling points of the direct signal. The values produced by this multiplication operation are scaled by an adaptation constant and accumulated to produce the filter coefficients which are used to cancel the ghost signals.
REFERENCES:
patent: 3914691 (1975-10-01), Meadors, Jr.
patent: 4021738 (1977-05-01), Gitlin et al.
patent: 4089061 (1978-05-01), Milewski
patent: 4127874 (1978-11-01), Iwasawa et al.
patent: 4191853 (1980-03-01), Piesinger
patent: 4285006 (1981-08-01), Kurahashi et al.
patent: 4330861 (1982-05-01), Impallomeni et al.
patent: 4359778 (1982-11-01), Lee
patent: 4374400 (1983-02-01), Holmes
patent: 4389623 (1983-06-01), Onishi et al.
patent: 4542408 (1985-09-01), Lewis, Jr.
patent: 4571720 (1986-02-01), Chevreau et al.
patent: 4584583 (1986-02-01), Dennis, Jr. et al.
Shimbo, H. et al., Automatic Ghost Equalizer with Digital Signal Processing Proc., IEEE Spring Conf. of Cons. Elect., Jun. 1983, pp. 180-183.
Thedick, H. Adaptive Multipath Equalization for T.V. Broadcasting, IEEE Trans. on Cons. Elect., 5/77, pp. 175-181.
Orfanidis, S. J. Optimum Signal Processing, An Introduction, pp. 278-289.
Lewis, Jr. Henry G.
Ng Sheau-Bao
Britton Howard W.
Herrmann Eric P.
Nigon Kenneth N.
Pong John K.
Rasmussen Paul J.
LandOfFree
Adaptive television deghosting system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive television deghosting system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive television deghosting system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1274983