Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-12-16
1984-10-16
Murray, Richard
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 9491
Patent
active
044778376
ABSTRACT:
In a chrominance signal reproduction system for a colored image signal recording-reproducing apparatus in which two chrominance differential signals I and Q are frequency modulated and superimposed on each other to be recorded, and in the reproduction of the two modulated waves the carrier frequency f.sub.1 of the first modulated wave recorded in a low frequency band is converted to a higher carrier frequency f.sub.3 and demodulated, the higher carrier frequency f.sub.3 is selected so as to be separated from the sum frequency f.sub.1 +f.sub.2 component of the carrier frequency f.sub.2 component of the modulated wave recorded in the higher frequency band and the carrier frequency f.sub.1 component of the modulated wave recorded in the lower frequency by more than the frequency band of the demodulated signal. By setting the frequency f.sub.3 in this way, any beat interference can be eliminated from the reproduced signal of the signal recorded in the lower frequency band.
REFERENCES:
patent: 4045812 (1977-08-01), Verhoeven et al.
Matsushita Electric - Industrial Co., Ltd.
Murray Richard
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