Patent ID: 7889109

Claim:
A ΔΣ modulation digital-analogue converter comprising: ΔΣ modulation means including integrating means including at least one integrator for integrating a digital signal, and quantizing means for modulating an output of the integrating means into a quantized signal, the ΔΣ modulation means feeding back the quantized signal to an upstream of the integrating means; a switching amplifier for generating a switching pulse in accordance with the quantized signal; a low-pass filter for demodulating the switching pulse; storage means in which a first compensation function is stored in advance, the first compensation function indicating a correspondence relationship between each of a plurality of possible input values of an input signal which is externally supplied, and each of compensation values that are individually associated with the possible input values; and compensation means for compensating the input signal which is externally supplied, based on a compensation value associated with the input signal among the compensation values, and supplying to the ΔΣ modulation means the input signal thus compensated; the first compensation function being set based on a spectrum of odd-order harmonics whose frequencies are A times more than a frequency of the input signal (A is an odd number), the spectrum being obtained in such a manner that an output of the switching amplifier or an output of the ΔΣ modulation digital-analogue converter is subjected to a frequency-analysis without a compensation carried out with respect to the input signal by the compensation means.