| 摘要 |
<P>PROBLEM TO BE SOLVED: To output the measurement results of acceleration from which the noise due to singing of a loudspeaker mounted in the same housing is removed. <P>SOLUTION: In an acceleration sensor IC 7 mounted on a portable apparatus, a 3-axis acceleration sensor 71 outputs the measurement results of acceleration for orthogonal X axis, Y axis and Z axis, and an A/D converter 73 converts an analog signal of the measurement results of acceleration input from the 3-axis acceleration sensor 71 into a digital signal. An adaptive filter 74 receives an externally input digital signal representing an acoustic signal being output to a loudspeaker mounted on the portable apparatus, and removes the noise component of acceleration obtained from the externally input digital signal from the measurement results of acceleration that is input from the A/D converter 73. An interface circuit 77 outputs the signal of acceleration from which the noise component is removed by the adaptive filter 74 to the control unit of the portable apparatus. <P>COPYRIGHT: (C)2013,JPO&INPIT |
