Digital multiband filter and method thereof

Details Digital multiband filter and method thereof Digital multiband filter and method thereof

1993-08-23

1994-09-06

Malzahn, David H.

Boots, shoes, and leggings

348663, H04N 978

Patent

active

053454073

ABSTRACT:
A digital multiband filter separates luma data and chroma data from a digitized composite video signal. A multiband filter receives a digital composite video input signal and provides a low-pass response at a first predetermined frequency containing the luma data, a band-pass response between second and third predetermined frequencies containing the chroma data, and a high-pass response. A notch filter rejects the band-pass response from the multiband filter while passing the luma data. A delay circuit delays the multiband output signal to match the delay through the notch filter. A junction circuit subtracts the low-pass response provided from the delayed multiband signal to isolate the chroma data. An alternate embodiment replaces the notch filter with a band-pass filter to provide a band-pass response with the chroma data at its output. The band-pass response is subtracted from the delayed multiband signal for providing the luma data.

REFERENCES:
patent: 5119179 (1992-06-01), Hagino
patent: 5161006 (1992-11-01), Monta et al.
patent: 5194942 (1993-03-01), Sim et al.
patent: 5231478 (1993-07-01), Fairhurst
patent: 5249040 (1993-09-01), Sugiyama

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