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:
May. 25, 1982
Filed:
Oct. 10, 1980
Ollie J Allen, Ellicott City, MD (US);
Other;
Abstract
There is disclosed a new and improved device which facilitates the tuning of musical instruments to a standard frequency with speed and accuracy. The device includes an indicating means comprising a plurality of light emitting diodes. The cathode of each diode is coupled to a saturated audio amplifier which is adapted to be coupled either directly to or by a microphone to a musical instrument to be tuned. The anodes of the diodes are coupled to an oscilator which provides any one of a plurality of selectable output frequencies which are harmonically related to a corresponding plurality of standard frequencies. The number of diodes, and the relation between the harmonic oscilator output frequency to the standard frequencies are such that when the instrument is in tune, one half of the diodes appear to be continuously and simultaneously lit. If the instrument is high or low in pitch relative to the selective standard frequency, the diode display will appear to move in first or second respective directions to thereby provide an easily discernable indication as to how the instrument must be adjusted to be brought into tune.