ΔΣ modulation digital-analog converter, digital signal processing method, and av device

Abstract

A ΔΣ modulation digital-analogue converter of the present invention includes: a look-up table in which a correspondence relationship between each of a plurality of possible input values of an input signal externally supplied, and each of compensation values individually associated with the possible input values, are stored; and a nonlinear compensation circuit () for compensating the input signal externally supplied, based on a compensation value associated with the input signal among the compensation values, and supplying a ΔΣ modulation section () the input signal thus compensated. A sine wave is used as the input signal. The compensation value is set based on magnitudes of a spectrum of odd-order harmonics whose frequencies are A times more than a frequency of the sine wave (A is an odd number), the spectrum obtained in such a manner that an output of a D-Class amplifier () or an output of the ΔΣ modulation digital-analogue converter is subjected to a frequency analysis without a compensation with respect to the sine wave by the nonlinear compensation circuit (). Therefore, it is possible to provide a ΔΣ modulation digital-analogue converter which (i) suppresses generation of odd-order harmonics with a simple circuit arrangement, and therefore (ii) is excellent in SNR and THD+N.