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. 14, 2019
Filed:
Dec. 29, 2015
China Academy of Telecommunications Technology, Beijing, CN;
CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing, CN;
Abstract
Disclosed are a determination method and apparatus for pre-set set parameters of an audio equalizer (AEQ), which are used for reducing an overflow phenomenon of fixed-point arithmetic output of all levels of second-order infinite impulse response (IIR) filters while frequency response amplitude curves of an AEQ remain unchanged, and reducing non-linear distortion, thus reducing total harmonic distortion (THD) of an AEQ system. The determination method for pre-set set parameters of an AEQ comprises: determining a first frequency point set by utilizing frequency response amplitude curves of an AEQ; adjusting the frequency response of frequency response amplitude curves of all levels of second-order IIR filters at a frequency point in the first frequency point set, so that the frequency response of the frequency response amplitude curves of all the levels of second-order IIR filters at the frequency point in the first frequency point set satisfies a pre-set condition; and adjusting a first parameter set and a second parameter set according to the adjusting variable of the frequency response amplitude curves of all the levels of second-order IIR filters, and determining the adjusted first parameter set and the adjusted second parameter set as pre-set set parameters of the AEQ.