| 摘要 |
PURPOSE:To obtain a stereophonic effect even when a listener is not at a center between two speakers by deciding the position of the listener with measuring the impedance variation of the speaker and reproducing a sound volume and a phase corresponded with the position. CONSTITUTION:The impedance of a speaker 7 is measured to decide the position of the listener. With setting a switch 3 and 6a to an A side and by adding an impedance measuring signal 1 to a speaker 7a, the impedance at that time is measured by an impedance measuring circuit 8. The impedance of the speaker is varied by a reflection by the providing position of the speaker and a person etc. A value measured by the impedance measuring circuit 8 is transferred to and stored at a storing means 10. Also at the storing means 10, the impedance values of the speakers 7a and 7b are already stored. Following that, by measuring the impedance of the speaker 7b and by adjusting the sound volume level according to the position of the listener, the listener, even when he/she is not at the center between the two speakers 7a and 7b, can listen the sound at the same level of the sound volume snabling a listening with a sterephonic feeling. |
