Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-09-11
1987-07-14
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 22, 358183, 340727, 382 46, H04N 514, H04N 975
Patent
active
046806300
ABSTRACT:
An arrangement for rotating television pictures comprises a frame store into which a rotated input picture is written under the control of a write address generator which is in turn controlled by a rotation control and timing generator. A video input signal is applied at input and fed to a splitting circuit which produces streams of even and odd numbered samples, both at the sampling rate. These streams of samples are fed to an interpolator where they are used to generate samples to be written into the store. The store is split into four areas which are arranged to hold respectively field 1 odd samples, field 1 even samples, field 2 odd samples, and field 2 even samples. The write address generator is controlled so that samples from field 1 of the input signal are fed only into the areas of the store read by the read address generator during field 1 of the output signal and samples from field 2 of the input signal are fed only into the areas of the store read by the read address generator during field 2 of the output signal.
REFERENCES:
patent: 4485402 (1984-11-01), Searby
patent: 4533952 (1985-08-01), Norman, III
patent: 4563703 (1986-01-01), Taylor et al.
Briody Thomas A.
Gadson Gregory P.
Groody James J.
Parker Michael D.
Streeter William J.
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