资料来源 : Free On-Line Dictionary of Computing

non-uniform quantising logarithmic compression
     
        The kind of {compression} often applied to a sound waveform.
        {Logarithmic compression} is a good match for the human ear's
        sensitivity but cannot handle zero amplitude (for which the
        logarithm is negative infinity).  There are two {standard}
        compression functions which give a smooth transition between
        the logarithmic function and a linear segment passing through
        the origin: {mu-law} (North America) and {A-law} ({ITU-T}).
     
        (1995-02-21)