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:
Sep. 10, 1985
Filed:
Mar. 11, 1983
Michael L Collette, San Francisco, CA (US);
Otari Electric Co., Ltd., Tokyo, JP;
Abstract
Apparatus for adjusting the speed of an audio tape capstan to a speed such that an audio tone prerecorded on the tape corresponds to a reference frequency, the apparatus thereafter phase locking the frequency of the audio tone to the reference frequency. The apparatus stores a signal corresponding to the last tape speed utilized even after the tape has stopped, allowing for faster phase lock after the tape has started again. Logic circuitry determines the presence of a valid tape audio tone, and means are included for adjusting the system gain to substantially reduce any wow or flutter which normally would result from damaged or spliced tape. A phase adjust knob is provided to allow for offset of the phase locked condition if necessary. The apparatus includes a pair of frequency-to-voltage converters which provide an essentially ripple-free DC voltage output while permitting a response time of only a few cycles of a relatively low (typically 60 Hertz) input frequency.