FM audio record reproducing apparatus having circuitry for preve

Details FM audio record reproducing apparatus having circuitry for preve FM audio record reproducing apparatus having circuitry for preve

1989-07-18

1992-05-05

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 30, 360 191, G11B 1514, G11B 502, G11B 2006

Patent

active

051113465

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.

REFERENCES:
patent: 4669002 (1987-05-01), Nishioka et al.
patent: 4692914 (1987-09-01), Yasumura et al.

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