Apparatus for deriving a compatible low-definition interlaced te

Details Apparatus for deriving a compatible low-definition interlaced te Apparatus for deriving a compatible low-definition interlaced te

1991-06-12

1993-01-26

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358138, H04N 704, H04N 712, H04N 700

Patent

active

051826453

ABSTRACT:
Apparatus for deriving a compatible low-definition interlaced television signal and other components for restructuring the original signal from an interlaced high-definition television signal. The HDTV signal is divided into four component signals by horizontal and vertical low-pass and high-pass QMF filtering. For the vertical filtering, one field of a frame is filtered by an odd-length filter, the other field by an even-length filter. A time delay of one sample is introduced before the high-pass odd-length QMF filter. The component signals are each subsampled by a factor of two after filtering. The component signal covering the low-frequency horizontal and low-frequency vertical range is a reduced definition interlaced TV signal. To reconstruct the original HDTV signal, all four component signals are upsampled and filtered and a one sample delay is introduced following the low-frequency odd-length filter.

REFERENCES:
patent: 4766494 (1988-08-01), Doyle
patent: 4815023 (1989-03-01), Arbeiter
patent: 4817182 (1989-03-01), Adelson et al.
patent: 4829378 (1989-05-01), LeGall
patent: 4918524 (1990-04-01), Ansari et al.
patent: 5021882 (1991-06-01), Schreiber

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