NTSC interference detector

Details NTSC interference detector NTSC interference detector

1994-12-07

1996-08-13

Metjahic, Safet

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348 21, 375346, 375350, 455 63, H04N 700

Patent

active

055461328

ABSTRACT:
An NTSC interference detector is disclosed which includes an NTSC extracting filter for extracting an NTSC signal component from a received I-channel signal; a comparing portion for integrating the NTSC signal output from the NTSC extracting filter for a predetermined period and deciding whether the NTSC signal component is above a first reference value or not; and a control signal generator for adding the signal output from the comparing portion for every horizontal sync, deciding the presence or absence of NTSC interference according to a second reference value, and outputting a control signal according to the presence or absence of NTSC interference, thereby accomplishing a precise detection of NTSC interference.

REFERENCES:
patent: 5087975 (1992-02-01), Citta et al.
patent: 5121203 (1992-06-01), Citta
patent: 5151785 (1992-09-01), Citta
patent: 5181112 (1993-01-01), Citta et al.
patent: 5260793 (1993-11-01), Citta et al.
patent: 5325204 (1994-06-01), Scarpa
patent: 5408262 (1995-04-01), Kim et al.
patent: 5410569 (1995-04-01), Halozan
patent: 5438369 (1995-08-01), Citta et al.

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