Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1987-01-30
1989-05-16
Hix, L. T.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358 31, 358330, H04N 979
Patent
active
048314633
ABSTRACT:
Apparatus is disclosed for processing incoming scanning lines of video information having a nominal bandwidth for use with a bandwidth degrading path, such as magnetic tape.
A preprocessor includes a preprocessor comb filter for comb filter processing of the incoming scanning lines to assure the presence of spectral gaps between energy groups in the spectrum of the video information. A fold over circuit folds over high frequency video components of the video information about a predetermined folding frequency to provided folded video. A low pass filter filters the resultant folded video to limit the spectrum thereof to be not greatly in excess of one half of the folding frequency.
A postprocessor includes an unfolding circuit for unfolding the signal from the path about the predetermined folding frequency. A postprocessor comb filter processes the unfolded signal to eliminate unwanted alias components therein resulting during the unfolding process and provides a resultant video signal closely approximating the bandwidth and content of the original video information.
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Television Engineering Handbook, K. Blair Benson, McGraw-Hill Book Company, p. 1.9 "1.2.3 Luminance".
IEEE Transaction on Consumer Electronics, Nov. 1986, vol. CE-32, No. 4, Development of HDTV Receiving Equipment Based on Band Compression Technique, Nakagawa, Kojima, Noda, Shinkawa, Furuhata.
Reprinted from IEEE Communications Society "IEEE Global Telecommunications Conference", Dec. 2-5, 1985, NTSC Full Compatible Extended Definition TV Proto Model and Motion Adaptive Processing, Fukinuki, Hirano, Yoshigi Fully Compatible EDTV* (edtv: Extended Definition Television)--Central Research Laboratory, Hitachi, Ltd.
Reprinted for Philips Technical Review, vol. 43, No. 8, 1987, HD-MAC: A Step Forward in the Evolution of Television Technology, Annegarn, Arragon, de Haan, van Heuven, Jackson.
Harrison David B.
Hix L. T,.
Rutledge D.
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