| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize an acoustic reproducer in which acoustic information in a low range is not deteriorated even when a speaker of small diameter is used. <P>SOLUTION: Low range acoustic information deteriorated by a speaker 9 is separated and extracted by a band pass filter 2 from input acoustic information. Double and three-time double multiplication waveform and three-time multiplication waveform of the fundamental frequency of this low range acoustic information are formed by a beat generating circuit 20. And, addition or subtraction is performed and beats of the frequencies coincident with the basic frequency are generated, and outputted to the speaker 9 as the low range output acoustic information. Accordingly, without deteriorating the low range acoustic information by the speaker 9 and consciousness equivalent to the pitch and the strength of the low range acoustic information which becomes a basis is realized to be generated in human being. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
