| http://www.w3.org/ns/prov#value | - That is, NSR for the m'th band is given by the formula (7). ##EQU5## If the NSR value is larger than a predetermined threshold of e.g. 0.3, that is, if the error is larger, it may be concluded that approximation of |S(j)| by |Am | |E(j)| for the band is not good, that is, the excitation signal |E(j)| is inappropriate as the base, so that the band is determined to be UV (unvoiced).
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