| http://www.w3.org/ns/prov#value | - A sound signal equalizer for adjusting gain in each of first to n.sup.th (where n is an integer of 2 or higher) frequency bands of an initial sound signal, the circuitcomprising: first to n.sup.th extraction circuits that are provided in corresponding fashion to the first to n.sup.th frequency bands and that extract and output a corresponding frequency band component of the initial sound signal, f
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