Method for noise suppression and noise-suppression circuit for video recorders

Method for noise suppression and noise-suppression circuit for video recorders

PCT No. PCT/DE94/01456 Sec. 371 Date Mar. 8, 1996 Sec. 102(e) Date Mar. 8, 1996 PCT Filed Dec. 7, 1994 PCT Pub. No. WO95/16326 PCT Pub. Date Jun. 15, 1995A noise suppression apparatus and method for recorded luminance signals in which a level of an FM signal from the recording medium is detected, an...

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Bibliographische Detailangaben
Hauptverfasser: CHMIELEWSKI, INGO, ARNOLD, HANS-PETER, RAETH, DETLEF
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Zusammenfassung:PCT No. PCT/DE94/01456 Sec. 371 Date Mar. 8, 1996 Sec. 102(e) Date Mar. 8, 1996 PCT Filed Dec. 7, 1994 PCT Pub. No. WO95/16326 PCT Pub. Date Jun. 15, 1995A noise suppression apparatus and method for recorded luminance signals in which a level of an FM signal from the recording medium is detected, and the level of the recovered chroma signal is detected, the luminance signal is bandpass filtered and limited. A subtraction signal is generated based on the filtered and limited luminance signal and having magnitude based on the detected level of at least one of the chroma signal and the FM signal. The subtraction signal is subtracted from the luminance signal to generate a noise suppressed luminance signal. The passband of the bandpass filter may be varied based on at least one of the chroma signal and the FM signal.