Controlling the phase of a frequency-modulated wave so as to be

Details Controlling the phase of a frequency-modulated wave so as to be Controlling the phase of a frequency-modulated wave so as to be

1990-03-23

1993-03-02

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358336, 358340, 358330, H04N 576

Patent

active

051914336

ABSTRACT:
A video tape recorder wherein when a video signal is frequency-modulated, the phase of a frequency-modulated wave is in a predetermined phase relationship with respect to the video signal. The frequency modulator is driven so that the video signal is time-base compressed to form a space of time. Then, a non-video signal is inserted into the space of time, and the frequency-modulated wave is brought into a predetermined phase having a synchronous relationship with the video signal. Furthermore, in another arrangement, during the reproducing operation, a regenerative demodulated signal is time-base expanded in order to avoid outputting noise due to the discontinuity in phase of the frequency-modulated wave which has arisen within the non-video signal contained space of the regenerated demodulated signal.

REFERENCES:
patent: 4245262 (1981-01-01), Ohtsu
patent: 4763206 (1988-08-01), Takahashi et al.

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