Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-04-26
1987-10-06
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358343, 360 191, H04N 5782
Patent
active
046986936
ABSTRACT:
A rotary head type magnetic recording and reproducing apparatus comprises a circuit for recording and reproducing a signal on and from a magnetic recording medium by rotary heads, a circuit for obtaining a frequency modulated (FM) audio signal by frequency-modulating a carrier by an audio signal which is to be recorded, a circuit for generating a frequency drift detection signal having a constant frequency which does not exist within a frequency range occupied by the FM audio signal, a circuit for obtaining a frequency multiplexed signal by frequency-multiplexing the FM audio signal and the detection signal, a circuit for separating the FM audio signal and the detection signal from the signal reproduced by the rotary heads, a demodulating circuit for obtaining an audio signal by frequency-demodulating the separated FM audio signal, a detecting circuit for frequency-demodulating the separated detection signal and for detecting a frequency drift component, a circuit for forming a frequency drift correction signal responsive to the output of the detecting circuit, and a circuit for correcting a frequency drift component in the output audio signal of the demodulating circuit by the correction signal.
REFERENCES:
patent: 4490753 (1984-12-01), Ito et al.
Fujiwara Hisashige
Hirohashi Kazutoshi
Ishigaki Yukinobu
Namiki Yasuomi
Meller Michael N.
Richardson Robert L.
Victor Company of Japan Ltd.
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