| 摘要 |
<p>A band expanding device (1) is provided with a first generating means (111, 121) for generating a base band signal (x<SUB>B</SUB>(n)) by up-sampling an input signal (x(n)) and then making the up-sampled input signal pass through a low pass filter, a second generating means (21) for generating a high frequency band signal (x<SUB>H</SUB>(n)) by squaring a band limited signal (x<SUB>b</SUB>(n)) that is a prescribed band component signal out of the base band signal to obtain a signal (x<SUB>b</SUB></p> |
