FM audio record reproducing apparatus having circuitry for preventing discontinuities during channel switching or switching of read heads
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United States of America Patent
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May 5, 1992
Grant Date -
N/A
app pub date -
Jul 18, 1989
filing date -
Jul 20, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reproducing apparatus which is provided with: frequency converting means for performing frequency conversion of the FM regenerative signals respectively from the read heads, on the basis of frequency conversion signals each having a frequency different from the frequency of the carrier; voltage-controlled oscillators for generating the frequency conversion signals, respectively; phase comparators for comparing phases of two FM regenerative signals frequency-converted by the frequency converting means in the overlap period so as to produce a difference signal corresponding to the difference between the phases; switching circuits for feeding the difference signal generated by the phase comparators, into one of the voltage-controlled oscillators generating the frequency conversion signal for frequency conversion of succeedingly reproduced one of the FM regenerative signals in the overlap period; and loop filters for stabilizing a loop system constituted by the aforementioned parts; whereby the phases of two frequency-changed FM regenerative signals are made to coincide with each other before the switching of the output in the overlap period.
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