| 摘要 |
Method and signal processing apparatus for reducing the number of bits of a digital input signal (M>i<) comprising the steps of adding a pseudo-random noise signal (N>a<) to the digital input signal (M>i<) to obtain an intermediate signal (D>i<), the pseudo-random noise signal (N>a<) being defined by noise parameters (N>p<), and quantising the intermediate signal (D>i<) having a word length of n bits to a reduced word length signal (M>e<) having a word length of m bits, n being larger than or equal to m. The method further comprises the step of quantising the intermediate signal (D>i<) comprises a first transfer function which is non-linear, the first transfer function being defined by non-linear device parameters (NLD>p<). Also, the present invention relates to a method and signal decoding apparatus for recovering an output signal (M>o<) from a reduced word length signal (M>e<) provided by the method according to the invention.
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