| 摘要 |
<P>PROBLEM TO BE SOLVED: To reliably remove influences by noise elements and to perform accurate weight estimation in a technology for estimating article weight on the basis of probability density function of amplitude of a measurement signal. <P>SOLUTION: The signal processor has: a plurality of N filters CH<SB POS="POST">1</SB>to CH<SB POS="POST">N</SB>for extracting from a measurement signal, signal components S<SB POS="POST">1</SB>to S<SB POS="POST">N</SB>in a plurality of N partial bands different within a frequency range except that of DC and its vicinity among bands to be processed of a measurement signal s(t); a whole band data processing part 25 for calculating amplitude probability density function PDF<SB POS="POST">0</SB>of an output signal S<SB POS="POST">0</SB>of the whole band to be processed during a prescribed period when article is loaded on a load sensor; a plurality of N partial band data processing parts 30(1) to 30(N) for calculating probability density functions PDF<SB POS="POST">1</SB>to PDF<SB POS="POST">N</SB>during the prescribed period of the amplitude of the signal components S<SB POS="POST">1</SB>to S<SB POS="POST">N</SB>in the plurality of N partial bands respectively; and a weight estimation part 40 for estimating weight of the article on the basis of the probability density functions PDF<SB POS="POST">0</SB>to PDF<SB POS="POST">N</SB>obtained. <P>COPYRIGHT: (C)2013,JPO&INPIT |
