| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound field full of presence without placing a rear speaker in the acoustic device that reproduces an acoustic signal where front/ rear virtual sound sources are in existence. SOLUTION: A sound source 1 generates 4-channel acoustic signals. A signal RL in the acoustic signals is delayed by a delay circuit 8 and a prescribed frequency characteristic is given to the delayed signal by a filter circuit 9, and a signal RR in the acoustic signals is given to an attenuator 15, where the level of the signal RR is attenuated, the attenuated signal is delayed by a delay circuit 16 and a filter circuit 17 gives a prescribed frequency characteristic to the delayed signal. Then an adder 18 sums the signal RL passing through the filter circuit 9 and the signal RR passing through the filter circuit 17, the sum signal is amplified by an amplifier 19 and sounded by a left speaker of an open headphone 22. |
