| 摘要 |
PURPOSE:To absorb and remove a reflected sound at a head part on the propagation path of the reflected sound at the head part or to absorb and reduce it and to obtain effective evaluation information on the goodness and the badness of a reproducing system by placing a sound absorption material or the like in the vicinity of the assumed position of the head of a listener. CONSTITUTION:A noise eliminating member 2 is placed between the assumed position 1 of the head of the listener and a speaker 4 connected by a straight line and constituted in the position near to the position 1 and fixed by a support member 9 nearly enough to contact the cheek of the listener 10. Similarly, a noise eliminator 3 is placed between the position 1 and a speaker 5 connected by a straight line and fixed to the member 9 in the equal contact state to the member 2. Thereby, an area near to the position 1 is different from a free space slow in a propagation speed and large in a propagation loss. Accordingly, the head reflected sound to which the listener can generally listen in the free space and is reflected in the head and reach an external auditory meatus is largely attenuated by the propagation loss, absorbed and reduced and the effective evaluation information on the goodness and the badness of the reproducing system can be obtained.
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