| 摘要 |
<p>PURPOSE: To enable function as an efficient DSP filter with few circuit elements by increasing the number of acoustic signals to be samples in a low-frequency band and reducing that number to be sampled in a high-frequency band. CONSTITUTION: An audible frequency band, sampled at a prescribed frequency, is divided into a large rubber of bands by band filters 11-13. Band-divided acoustic data are extracted at ratios which are mutually different for hands by extracters 14-16. The distortion in extracted acoustic data is corrected by bands by FIR filters 17-19. The distortion-corrected acoustic data are synchronized and synthesized out by synthesizing parts 20-22, so as to be the same order as acoustic data at the time of inputting them to the frequency band dividing means. Band filters 23-25 remove the noise of data which are outputted from the synchronizing parts 20-22. An adder 26 adds out the data, from which the noises are removed by the band filters to the outputs of synchronizing parts 20-22.</p> |
