| 摘要 |
PURPOSE:To allow person being hard of hearing to listen to clear sound while a fitting frequency characteristic is kept independently of the setting state of a sound collecting microphone device by collecting sound with a microphone device where microphone elements are arranged on the circumference of flat plate different from the center position of the flat plate having a prescribed area. CONSTITUTION:A flat plate of a prescribed form hving a prescribed area as a rigid body plane, e.g., a disc form flat plate 5 having a radius of (a), is provided and a microphone element 6 is arranged at a position on the circumference of the flat plate different from the center position (c) of the flat plate 5, e.g., a position apart from the center position (c) by 3/4a. As the flat plate 5, square, rectangular form or the other forms can be used as the disc. Further, a sound source 7 is provided to an upper part to the microphone element 6 on the flat plate 5 spacing by a prescribed distance. Sound is collected by this microphone device and the other parts are formed similarly as those of a conventional hearing aid. Thus, the fitted frequency characteristic is kept independently of the setting state of the sound collecting microphone and clear voice is listened to by a person being hard of hearing. |
