| 摘要 |
PROBLEM TO BE SOLVED: To provide the spreading feeling of a sound field with simple constitution without the need of special circuits such as an adder and a subtractor, etc., by respectively providing plural voice coils in speaker units for left side and a right side and supplying prescribed signals for the right side and for the left side to the respective voice coils. SOLUTION: Left side, right side and center speakers 11-13 are respectively full range speakers and provided with double voice coils 11a-13a and 11b-13b capable of simultaneously adding the input of 2 systems. In this case, the voice coil 11b of the speaker 11 is wound in an opposite direction to the voice coil 11a and the voice coil 12b of the speaker 12 is wound in the opposite direction to the voice coil 12a. Then, the signals of a×L and -b×R are inputted to the left side voice coil and the signals of c×R and -d×L are inputted to the right side voice coil. In this case, L is a left side signal, R is a right side signal and (a)-(d) are optional coefficients and provided with the relation of (a)>=(b) and (c)>=(d). Thus, the spreading feeling of the sound field and a reverberation feeling are obtained just by a speaker side. |
