Field/frame conversion circuit

Details Field/frame conversion circuit Field/frame conversion circuit

1987-05-07

1989-03-14

Perkey, W. B.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358335, 360 91, H04N 576, H04N 979

Patent

active

048129194

ABSTRACT:
A field/frame conversion circuit for use in a magnetic recording/reproducing apparatus which magnetically records and reproduces still images or the like.
In the field/frame conversion circuit, after the frequency of a field signal obtained from a magnetic recording medium such as a magnetic disc and composed of frequency-multiplexed brightness and chroma signals is converted into a higher frequency band than the frequency band of the brightness signal, the field signal is delayed in the frequency modulated state thereof 0.5 horizontal scan period necessary for the field/frame conversion by a signal delay line having a wide band frequency characteristic. The thus delayed field signal and an undelayed field signal are selected alternately at every one vertical scan period by signal switching means so as to perform the field/frame conversion.

REFERENCES:
patent: 3990107 (1976-11-01), Hanma et al.
patent: 4298896 (1981-11-01), Heitmann
patent: 4470076 (1984-09-01), Arai et al.

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