| 摘要 |
PURPOSE:To flatten a sound pressure frequency characteristic in the car room even in the kind of a car without having a hermetic space by setting the lowest frequency among the frequencies to which the imaginary part of a sound impedance in the car room goes to zero, and a low band resonance frequency of the single unit of a speaker system in a free space, to be approximately equal. CONSTITUTION:When the lowest frequency among the frequencies to which the imaginary part of the sound impedance towards the car room looked from the sound emitting plane of the speaker system goes to zero, is assumed as Fs, and on the other hand, the low band resonance frequency of the speaker system itself in the free space is assumed as F0, the F0 and the FS are set to be approximately equal. Accordingly, when the speaker system is installed at a rear tray at the inside of the car room, even if the sound pressure is raised in the frequency lower than the frequency FS, because the emitted sound output itself of the speaker system is low, the deterioration of a sound quality due to a distortion caused from a speaker unit does not appear. Thus, the sound pressure frequency characteristic below the frequency FS in the car room can be made to approach to flatness.
|
