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. 25, 2020
Filed:
Sep. 19, 2019
Sound Solutions International Co., Ltd., Beijing, CN;
Friedrich Reining, Vienna, AT;
Sound Solutions International Company, Ltd., Beijing, CN;
Abstract
A measuring apparatus for measuring the force factor of a dynamic loudspeaker driver comprises first and second terminals for connecting a dynamic loudspeaker driver to the measuring apparatus, an amplifier configured to generate a voltage, a voltage measuring device configured to measure the voltage present at the first terminal, a displacement measuring device configured to measure the displacement of the membrane of the dynamic loudspeaker driver with respect to the magnet, and an electric/electronic device connected between the amplifier and the first terminal. The measuring apparatus is configured to operate in a first mode of operation the amplifier to generate a voltage and to operate the electric/electronic device to have a low impedance during the first mode of operation, such that the voltage is substantially present at the first terminal in order to displace the membrane with respect to the magnet. The measuring apparatus is configured to operate the electric/electronic device to have a high impedance during a second mode of operation, such that the dynamic loudspeaker connected to the measuring apparatus moves its displaced membrane, resulting in an induced voltage generated by the dynamic loudspeaker driver and being present at the first terminal. The measuring apparatus comprises an evaluation device configured to determine the force factor of the dynamic loudspeaker driver connected to the measuring apparatus in response to the measured displacement of the membrane and the induced voltage measured by the voltage measuring device during the second mode of operation.