| 摘要 |
<p>A method and signal processing apparatus for reducing the number of bits of a digital input signal (M<SUB>i</SUB>), includes adding a pseudo-random noise signal (N<SUB>a</SUB>) to the digital input signal (M<SUB>i</SUB>) to obtain an intermediate signal (D<SUB>i</SUB>), the pseudo-random noise signal (N<SUB>a</SUB>) being defined by noise parameters (N<SUB>p</SUB>), and quantizing the intermediate signal (D<SUB>i</SUB>), having a word length of n bits, to a reduced word-length signal (M<SUB>e</SUB>) having a word length of m bits, n being larger than or equal to m. The method further includes quantizing the intermediate signal (D<SUB>i</SUB>) using a first transfer function which is non-linear, the first transfer function being defined by non-linear device parameters (NLD<SUB>p</SUB>).</p> |
