Signal demodulating apparatus capable of effectively suppressing

Details Signal demodulating apparatus capable of effectively suppressing Signal demodulating apparatus capable of effectively suppressing

1993-06-29

1996-02-20

Kostak, Victor R.

Television

Receiver circuitry

Demodulator

358323, 360 27, H04N 5455, H04N 989, G11B 502

Patent

active

054933463

ABSTRACT:
A signal demodulating apparatus for demodulating FM video signals on which a pilot signal is mixed. The apparatus comprises an input circuit, a first deriving circuit, a pilot canceling signal generating circuit, a mixing circuit, a limiter and a demodulator. The input circuit admits the pilot signal-mixed frequency-modulated video signals. The first deriving circuit connected to the input circuit derives the pilot signal from the pilot signal-mixed frequency-modulated video signals. The pilot canceling signal generating circuit connected to the first deriving circuit generates a pilot canceling signal based on the derived pilot signal. The mixing circuit connected to the input circuit and the pilot canceling signal generating circuit mixes the pilot signal-mixed frequency-modulated video signals and the pilot canceling signal. The limiter connected to the mixing circuit limits the pilot-canceled frequency-modulated video signals to a predetermined level. The demodulator connected to the limiter demodulates the frequency-modulated video signals.

REFERENCES:
patent: 3571526 (1971-03-01), Stockwell et al.
patent: 4680792 (1987-07-01), Tanaka et al.
patent: 4815141 (1989-03-01), Carver et al.
patent: 5032925 (1991-07-01), Ganse et al.
patent: 5062005 (1991-10-01), Kitaura et al.
Patent Abstracts Of Japan vol. 8, No. 55 (P-260) 13 Mar. 1984 & JP-A-58 203 605 (PAIONIA) 28 Nov. 1983.
Patent Abstracts Of Japan vol. 11, No. 254 (E-533) 18 Aug. 1987 & JP-A-60 064 178 (Hitachi) 23 Mar. 1987.

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