Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-08-27
1988-03-01
McElheny, Jr., Donald
Facsimile and static presentation processing
Facsimile
Recording apparatus
358343, H04N 594
Patent
active
047290420
ABSTRACT:
A clock signal generating circuit for a data reproducing device, such as a device in which an audio signal is digitized and recorded in multiplex form together with other signals such as video signals, on a magnetic recording medium, wherein the stability of the frequency of the clock signal is maintained even in the presence of drop-out of the audio, video or other signals. The clock signal generating circuit includes a voltage-controlled oscillator receiving as a frequency-control input signal the output of a phase comparator comparing the output of the voltage-controlled oscillator with a pulse train signal extracted from the RF signal read from the recording medium. The voltage-controlled oscillator receives a second control signal which causes it to maintain its present frequency. The second control signal is produced by ORing drop-out signals generated when FM signals obtained by subjecting the video and audio signals to frequency modulation are no longer present in the RF signal.
REFERENCES:
patent: 4403262 (1983-09-01), Ito et al.
patent: 4555734 (1985-11-01), Fukui
patent: 4604659 (1986-08-01), Itoh et al.
patent: 4628371 (1986-12-01), Kuroda
McElheny Jr. Donald
Pioneer Electronic Corporation
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