US Patent 7912233 Speaker system for musical instruments

Patent 7912233 was granted and assigned to Roland Corporation on March, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Roland Corporation

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

79122330

Patent Inventor Names

Masayuki Takagi0

Kosuke Takata0

Date of Patent

March 22, 2011

Patent Application Number

115233030

Date Filed

September 19, 2006

Patent Primary Examiner

‌

Curtis Kuntz

Patent abstract

A speaker system for a musical instrument that detects the displacement of a voice coil of a speaker and provides feedback processing. The speaker system has a preamp that alters the frequency characteristics of the an electrical signal that has been input to an input terminal, and a power amplifier that amplifies the electrical signal. A speaker is driven by the power amplifier and a feedback unit detects the displacement of the speaker and provides a feedback signal to the power amplifier. The power amplifier amplifies the electrical signal in conformance with the output of the preamp and the feedback signal.