Noise immunity in N signals

Details Noise immunity in N signals Noise immunity in N signals

1990-06-01

1992-09-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, 358136, 358141, H04N 5213

Patent

active

051444356

ABSTRACT:
An arrangement for a television receiver to attenuate correlated noise injected by the transmission medium. Recognizing that there is substantial line to line correlation of the transmission noise injected by interfering television stations, this arrangement enhances noise immunity by inserting in the receiver a de-emphasis stage that includes a circuit for removing the correlated noise. To account for the modifications to the desired signal that are introduced by the de-emphasis circuit, a pre-emphasis circuit is included in the transmitter. In accordance with one embodiment, the receiver's circuit comprises a feed-forward arrangement where the received signal of a scan line is subtracted from a fraction of the received signal of the previous scan line. At the transmitter, a feedback loop develop a scan line to be transmitted that corresponds to a video scan line subtracted from a fraction of the previous scan line to be transmitted. This arrangement also removes some of the correlation in the signal of the video scan lines, which results in the developed scan lines having lower amplitudes. The latter permits insertion of a gain stage, which increases the signal power relative to the noise and thereby improves the signal to noise ratio at the receiver.

REFERENCES:
patent: 4684983 (1987-08-01), Acampora
patent: 4703350 (1987-10-01), Hinman
patent: 4837611 (1989-06-01), Faroudja
patent: 4851906 (1989-07-01), Koga
patent: 4918515 (1990-04-01), Faroudja
patent: 4926261 (1990-05-01), Matsumoto
patent: 4931743 (1990-06-01), Fukuda

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