Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-07-08
1987-02-17
McElheny, Jr., Donald
Facsimile and static presentation processing
Facsimile
Recording apparatus
360 32, H04N 592
Patent
active
046444122
ABSTRACT:
A video signal recording and reproducing apparatus comprises a circuit for generating a first signal having a sampling frequency f.sub.s which is approximately a natural number multiple of a horizontal scanning frequency f.sub.H of an input composite video signal and satisfies f.sub.s .apprxeq.f.sub.L +f.sub.U and having a phase which differs by 180.degree. for every one field, where f.sub.L represents a constant frequency in the range of 0.5 to 1 MHz and f.sub.U represents an upper limit frequency of a band required for a reproduced composite video signal, a circuit for sampling a signal part of the input composite video signal at least excluding synchronizing signal intervals thereof by the first signal, a circuit for recording and reproducing the sampled signal on and from a recording medium, a circuit for obtaining from the reproduced signal first and second reproduced sampled signals having a mutual time difference of one field, a circuit for generating from the reproduced signal a second signal having the frequency f.sub.s and having a phase which differs by 180.degree. for every one field, and a circuit supplied with the second signal for alternately and selectively passing the first and second reproduced sampled signals for every 1/2 period of the second signal so as to obtain a reproduced composite video signal which has been re-sampled.
REFERENCES:
patent: 4291331 (1981-09-01), Devereux
patent: 4590522 (1986-05-01), Takemoto et al.
patent: 4604658 (1986-08-01), Hibino et al.
Goldberg, "Extending PCM Video Response Above the Nyquist Limit", International Broadcasting Convention (Conference; London, England, Sep. 20-24, 1976), pp. 89-91.
Hirota Akira
Kosaka Yoshiteru
Nishimoto Naomichi
McElheny Jr. Donald
Victor Company of Japan Ltd.
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