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:
Aug. 27, 2019
Filed:
Apr. 17, 2018
Zoom Corporation, Tokyo, JP;
Michihito Nozokido, Tokyo, JP;
ZOOM CORPORATION, Tokyo, JP;
Abstract
A preamplifier for musical instruments includes: an operational amplifierto amplify an inputted analog audio signal; a dual-unit variable resistorto change an amplification factor of the operational amplifierby manually operating an operation unit; an A/D converterto convert the amplified analog audio signal to a digital audio signal; and a digital signal processorto digital-signal process the digital audio signal, wherein the dual-unit variable resistorincludes a second variable resistorto output a detection signal in accordance with an amount of operation of the operation unit, and the digital signal processoris capable of implementing, based on a value of the detection signal, a first digital gain process to amplify the digital audio signal and/or a second digital gain process to attenuate the digital audio signal.