发明名称 |
ADAPTIVE SIGNAL PROCESSING UNIT |
摘要 |
PURPOSE:To improve the specific filter effect and noise or the like by inputting two signals being digital data inputted and outputted to/from a speaker to an adaptive filter circuit as control information and minimizing the mean square error of input series of the two signals. CONSTITUTION:An adder circuit 5 takes a difference between an original audio data inputted through a data bus 1 and an audio data inputted through a data bus 12 through an acoustic space and the difference is used as an error signal and given to a data bus 13. A filter coefficient of an adaptive filter circuit 8 is decided so as to minimize the mean square of the error signal. Then weight information of the filter coefficient is latched by a slave filter circuit 1 and the weight of the filter coefficient is copied. Filter processing of the digital audio data using the optimum filter coefficient is applied in the said circuit 1 and its output is converted into an analog data and outputted from speaker with an amplifier. |
申请公布号 |
JPH03220812(A) |
申请公布日期 |
1991.09.30 |
申请号 |
JP19900016859 |
申请日期 |
1990.01.25 |
申请人 |
NEC CORP |
发明人 |
IWANAGA KENICHI;KIUCHI TOYOO |
分类号 |
H04R3/00;G10K15/00;H03H17/00;H03H17/02;H03H21/00;H04B3/04 |
主分类号 |
H04R3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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