Audio signal reproducing apparatus

Details Audio signal reproducing apparatus Audio signal reproducing apparatus

1996-12-03

1998-06-09

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Recording for changing duration, frequency or redundant...

360 65, G11B 5035

Patent

active

057644284

ABSTRACT:
An audio signal reproducing apparatus which can remove, upon variable speed reproduction, only noise such as noise caused by a bias frequency without sacrificing sound is disclosed. An audio signal recorded on a magnetic tape is reproduced by a magnetic head, amplified by an amplifier and supplied to a voltage controlled filter. Meanwhile, the feeding speed of the magnetic tape is detected by a tape speed detector and converted into a corresponding voltage by a tape speed to voltage converter, and the voltage is further converted into a control voltage by a control voltage generation circuit. The control voltage is supplied to the voltage controlled filter so that the cutoff frequency of the filter is varied in accordance with the control voltage. The cutoff frequency decreases as the feeding speed of the magnetic tape decreases. Signals of frequencies of the audio signal inputted to the filter which are lower than the cutoff frequency are maintained while noise components including a signal of a bias frequency are cut by the filter.

REFERENCES:
patent: 4442464 (1984-04-01), Ito
patent: 5247401 (1993-09-01), Umemoto et al.
patent: 5270875 (1993-12-01), Shah et al.
patent: 5392163 (1995-02-01), Higuchi et al.
patent: 5414568 (1995-05-01), Taki

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