| 摘要 |
PURPOSE:To obtain an inexpensive speaker with high performance by combining a single speaker having duplex voice coils whose phases are opposite to each other and a frequency band dividing filter, and separately reproducing the signals in the bands allocated to plural speakers. CONSTITUTION:To a first voice coil C1 of the duplex voice coils C1 and C2 opposite in phase each other of the single speaker 23, a drive signal to the speaker system is directly inputted, and to the second voice coil C2, a drive signal Ei is so inputted through the frequency band dividing filter 11 that it is subtracted from the input to the voice coil C1. The drive signal is separated into those in the frequency bands allocated to respective single speakers, and drives each speaker. |
