The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 1998
Filed:
Dec. 03, 1996
Atsumu Soda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
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.