Title:
オーディオ音伝達系の同定方式およびオーディオ用フィルタの特性設定方式
Document Type and Number:
Japanese Patent JP3581775
Kind Code:
B2
Abstract:
A designing system for adaptively characterizing an audio transmitting system has a white noise generating unit for generating a white noise signal. A speaker radiates the white noise generated by the white noise generating unit into an acoustic space. A microphone is placed at a predetermined position in the acoustic space and collects sound radiated from the speaker. A FIR adaptive filter receives the above white noise signal. An LMS algorithm processing unit updates each tap coefficient of the adaptive filter by using the LMS algorithm. A computation unit calculates the difference between a detection signal output from the microphone and an output of the adaptive filter and outputs the difference as an error signal epsilon. By using a white noise signal having an average power of one, the range of the step size parameter of the LMS algorithm required for stably operating the adaptive filter is fixed. According to the method for characterizing the audio transmitting system and the method for setting an audio filter, the stable operation of the adaptive filters is ensured without increasing the complexity of the overall system.
Inventors:
Nozomi Saito
Tomohiko Ise
Tomohiko Ise
Application Number:
JP14729297A
Publication Date:
October 27, 2004
Filing Date:
May 21, 1997
Export Citation:
Assignee:
Alpine Electronics Co., Ltd.
International Classes:
G10K15/00; H03H17/00; H03H21/00; H04R3/00; (IPC1-7): H03H21/00; G10K15/00
Domestic Patent References:
| JP7066647A | ||||
| JP4053996A | ||||
| JP7219564A |
Other References:
サイモン ヘイキン 著,武部 幹 訳,適応フィルタ入門(第2版),日本,現代工学社,1990年10月 1日,第108頁~第117頁
Stephen J.E.,Ian M.S.,Philip A.N. ,A multiple error LMS algorithm and its application to the active control of sound and vibration,IEEE Transactions on Acoustics, Speech, and Signal Processing ,米国,IEEE,1987年10月31日,Vol.ASSP-35,No.10,pp.1423-1434
Stephen J.E.,Ian M.S.,Philip A.N. ,A multiple error LMS algorithm and its application to the active control of sound and vibration,IEEE Transactions on Acoustics, Speech, and Signal Processing ,米国,IEEE,1987年10月31日,Vol.ASSP-35,No.10,pp.1423-1434