| http://www.w3.org/ns/prov#value | - The digital amplifier according to claim 1, further comprising: a memory for storing an input-output conversion table corresponding to the input-output relationship defined by an expression y=a {1???1(1???[x])n}, where x is the input digital signal, y is an output signal, [x] is the absolute value of x, n is an exponent representing the compression characteristics, and a is 1 for x???0 or ???1 for
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