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    • 9. 发明授权
    • ΔΣ modulation digital-analog converter, digital signal processing method, and AV device
    • &Dgr;&Sgr 调制数字模拟转换器,数字信号处理方法和AV设备
    • US07889109B2
    • 2011-02-15
    • US12521441
    • 2007-12-27
    • Yoshimitsu Murahashi
    • Yoshimitsu Murahashi
    • H03M3/00
    • H03F3/2173H03F2200/03H03F2200/331H03M3/388H03M3/50H03M7/3028H03M7/3033
    • 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 (6) 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 (1) 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 (2) 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 (6). 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.
    • A&Dgr&& 本发明的调制数模转换器包括:查找表,其中外部提供的输入信号的多个可能输入值中的每一个与分别与可能输入值相关联的每个补偿值之间的对应关系, 存储; 以及用于补偿外部输入信号的非线性补偿电路(6),其基于与所述补偿值中的输入信号相关联的补偿值,并且提供“ 调制部分(1)这样补偿的输入信号。 使用正弦波作为输入信号。 补偿值基于频率为正弦波的频率(A为奇数)的A倍的奇次谐波的频谱的大小设定,以使得D的输出 - 放大器(2)或输出&Dgr& 通过非线性补偿电路(6)对调制数模转换器进行相对于正弦波的补偿的频率分析。 因此,可以提供一个&Dgr& 调制数模转换器(i)以简单的电路布置抑制奇次谐波的产生,因此(ii)SNR和THD + N优异。