Audio signal reproducing apparatus

Details Audio signal reproducing apparatus Audio signal reproducing apparatus

1990-08-01

1992-08-25

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Recording or reproducing an information signal and a control...

Reference carrier to control demodulator

G11B 562

Patent

active

051424193

ABSTRACT:
An apparatus for reproducing from a recording medium a frequency-modulated audio signal which has its carrier level in a specific period determined according to the kind of information and for producing the audio signal after processing the reproduced audio signal is arranged to control the signal processing action according to the output of a detecting circuit which detects the level of a difference between the carrier level of the frequency-modulated audio signal obtained in the specific period and the carrier level obtained in a period other than the specific period or detects changes taking place in the carrier level. This arrangement enables the apparatus to process the audio signal appositely to the kind of the frequency-modulated signal thereof without recourse to any additional reproducing circuit solely for this purpose. Further, the apparatus is arranged to prevent any faulty signal processing action by nullifying as necessary the output of the detecting circuit.

REFERENCES:
patent: 4786986 (1986-11-01), Yamanushi et al.
patent: 4991027 (1991-02-01), Enoki

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