公开(公告)号：US20180048958A1

公开(公告)日：2018-02-15

申请号：US15550358

申请日：2015-12-29

Applicant: China Academy of Telecommunications Technology

Inventor： Min Liang ,  Bo Han ,  Ying Zou

IPC: H04R3/04 ,  H04B3/30 ,  H03G5/00 ,  H04L25/03 ,  H04R1/20 ,  H04B3/04

CPC classification number: H04R29/00 ,  H03G5/005 ,  H03G5/165 ,  H03H17/04 ,  H04R3/04 ,  H04R29/007

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.

公开(公告)号：US10291994B2

公开(公告)日：2019-05-14

申请号：US15550358

申请日：2015-12-29

Applicant: China Academy of Telecommunications Technology

Inventor： Min Liang ,  Bo Han ,  Ying Zou

IPC: H03G5/00 ,  H04R29/00 ,  H04R3/04 ,  H03G5/16 ,  H03H17/04

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.