| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a speech enhancing device which is capable of real-time processing and is free of deterioration in sound quality. <P>SOLUTION: The device includes a delay circuit 21 which delays an input signal x(n) being a noise added audio signal by one sampling time, a finite-length filter circuit 11 connected to the delay circuit 21, aγnormalization LMS coefficient adjusting unit 12b which adjusts aλnormalization LMS coefficient of the finite-length filter circuit 11, a subtracting circuit 13 which subtracts the output signal y(n) of the finite-length filter circuit 11 from the input signal x(n) and feeds the subtraction result back to theγnormalization LMS coefficient adjusting unit 12b, and a noise estimating unit 14 which estimates variance of white noise from the input signal x(n) and outputs the variance of white noise to theγnormalization LMS coefficient adjusting unit 12b. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
