Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1993-03-03
1994-08-02
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348476, H04N 5213, H04N 521
Patent
active
053350200
ABSTRACT:
A ghost cancelling system includes a ghost cancelling IIR filter and channel modelling circuitry for generating tap weighting coefficients for programming the ghost cancelling IIR filter. The channel modelling circuitry includes means for calculating the sum of all of the generated weighting coefficient values. If the sum exceeds a predetermined value indicative of the IIR filter becoming unstable, the weighting coefficients are conditionally scaled in a manner to reduce the sum, thus tending to reduce the possibility of filter instability.
REFERENCES:
patent: 4127874 (1978-11-01), Iwasawa
patent: 4344089 (1982-08-01), Utsunomiya
patent: 4583120 (1986-04-01), Murakami
patent: 4864403 (1989-09-01), Chao et al.
patent: 5065241 (1991-11-01), Iga
P. M. Ebert et al, "Overflow Oscillations in Digital Filters" Bell System Technical Journal, vol. 48, Nov. 1969 pp. 2999-3020.
Leland B Jackson "An Alysis of Limit Cycles Due to Multiplication Rounding in Recursive Digital Filters", Digital Signal Processing, edited by Rabiner and Rader, IEEE Press New York, 1972, pp. 439-447.
Grant Chris
Groody James J.
Herrmann Eric P.
Kurdyla Ronald H.
RCA Thomson Licensing Corporation
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