| 摘要 |
PROBLEM TO BE SOLVED: To localize a sound image at a prescribed position without any sound image surrounding the prescribed position by applying convolutional operation to a sound source by the use of a coefficient calculated based upon a virtual impulse response obtained by adding a reflected sound preceding a direct sound for a specific time. SOLUTION: Digital and analog audio signals are switched by a switch SW, the selected signal is converted into a parallel signal by a serial-parallel converter 5 and the parallel signal is supplied to right and left channel convolvers 6, 7 and 8, 9. Convolutional operation is applied to the sound source data on a time base by the use of a coefficient corresponding to a prescribed sound image localization position supplied from a controlling sub-CPU 11 to a ROM 10. The processed signals are added by respective adders 12, 13 as right and left channel signals and the added signals are outputted to speakers. The coefficient stored in the ROM 10 is calculated based upon a virtual impulse response obtained by adding a reflected sound of -10 to -13dB preceding the direct sound for 9.1 to 11.3 ms. Since the sound image is localized in the prescribed position by the method, a reproduced sound can be listened as a natural sound. |
