Chrominance signal recording apparatus utilizing digital samplin

Details Chrominance signal recording apparatus utilizing digital samplin Chrominance signal recording apparatus utilizing digital samplin

1984-11-19

1987-02-24

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358328, 360 362, H04N 9493

Patent

active

046461655

ABSTRACT:
A carrier chrominance signal recording apparatus comprises a first circuit for sampling a carrier chrominance signal at a sampling frequency which is four times a chrominance subcarrier frequency, and then quantizing the sampled signal so as to produce a first digital color signal, a second circuit for subjecting the first digital color signal to a phase shift process so as to produce a second digital color signal related to a carrier chrominance signal in which the phase of a chrominance subcarrier is equivalently and successively shifted by approximately 90.degree. in a predetermined direction for every one horizontal scanning period, a third circuit for converting the output second digital color signal of the second circuit into a frequency converted digital color signal which is in a low-frequency range, a circuit for obtaining an analog frequency converted carrier chrominance signal by subjecting the frequency converted digital color signal to a digital-to-analog conversion, and a circuit for recording the analog frequency converted carrier chrominance signal on a recording medium. A reproducing apparatus reproduces the signals recorded on the recording medium by the above recording apparatus.

REFERENCES:
patent: 4145704 (1979-03-01), Gallo

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