| 摘要 |
PROBLEM TO BE SOLVED: To make an acoustic signal have high sound quality and to make the acoustic signal have multiple functions by introducing the acoustic signal while calculatingly processing the acoustic signal from an acoustic source with a small calculation amount in a first mode and while converting the acoustic signal into an acoustic signal having a second sampling frequency and calculatingly processing it with a larger calculation amount in a second mode. SOLUTION: When an acoustic signal having a first sampling frequency f1 from an acoustic source 2 is reproduced in a first mode, the reproducing of the signal is performed while attaching importance to sound quality by making the calculation amount of a filter 9 small and by using a processing circuit as it is. When a second mode is selected by an input means 13, a second sampling frequency f2 is set. Therefor, a second sampling frequency converting circuit 4 is operated and the acoustical signal from the source 2 is converted into an acoustic signal having the second sampling frequency f2 by the circuit 4. Then, the characteristic of a filter 9 is made to be executed with high accuracy by setting the calculation amount of the filter 9 so as to become larger as compared with that in the first mode. |
