Attenuator, data signal processor, method for acquiring attenuation of attenuator, recording medium, and computer data signal

摘要

An address generator is supplied with a designated gain GT, and generates exponent data n and an address of mantissa A. The address of mantissa A is set based on an accuracy of the designated gain GT. A mantissa-coefficient acquiring unit is so structured as to acquire a mantissa-coefficient k based on an equation acquired in accordance with a relationship between the exponent data n and mantissa data for each address of mantissa A. A coefficient data acquiring section and a mantissa data acquiring section both included in the mantissa-coefficient acquiring unit generate a coefficient a and mantissa data d 1 , respectively, based on the address of mantissa A, whereby the mantissa-coefficient k can be acquired for the exponent data n with a high accuracy for each address of mantissa A.