Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-09-30
1988-05-17
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358329, 358 11, 358328, 360 331, 360 362, 360 39, 360 48, H04N 5782
Patent
active
047454920
ABSTRACT:
A video signal digital processing system comprises an A/D converter for converting an input analog video signal employing the NTSC or PAL system into a digital video signal, a first frequency converter for generating a signal sampled at a frequency f.sub.s which is a predetermined integer times a horizontal synchronizing signal frequency f.sub.H of the input analog video signal by frequency-converting the digital video signal so that the chrominance subcarrier frequency is converted into a frequency f.sub.s /4, a decimation circuit for performing a 1/3 decimation process with respect to the output signal of the first frequency converter by extracting samples with an interval of two samples, a processing circuit for subjecting an output signal of the decimation circuit to a predetermined signal processing, an interpolation circuit for performing an interpolation process complementary to the decimation process with respect to an output signal of the processing circuit, a second frequency converter for subjecting an output signal of the interpolation circuit to a frequency conversion complementary to the frequency conversion performed in the first frequency converter, and a D/A converter for converting an output signal of the second frequency converter into a an analog video signal.
REFERENCES:
patent: 4500912 (1985-02-01), Bolger
Kobayashi Kaoru
Ozaki Hidetoshi
Meller Michael N.
Richardson Robert L.
Victor Company of Japan Ltd.
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