音圧傾度形接話マイクロホンの設計

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書誌事項

タイトル別名
  • Design Method for the Close-talking Microphone of the Pressure Gradient Type
  • オンアツケイドケイセツワ マイクロホン ノ セッケイ

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抄録

Many of the close-talking microphones studied, are heavy and of large size and are usually held in the hand. Therefore the sound quality and the output level are unsteady because it is difficult to hold the microphone in the hand at a constant distance from the mouth. This paper describes the design method for the close-talking microphone for broadcasting use without the above defects. This close-talking microphone is the pressure gradient microphone of the moving coil type. In order to keep the microphone at a constant distance from the mouth, the microphone is attached on the cap. Two acoustic pipes that are lengthened to be close to the mouth are attached to both sides of the diaphragm. The relationship between the equivalent network elements of this microphone and the desired frequency response, sensitivity and noise canceling effect, were analized. Furthermore, a concrete method for the application of these values of the equivalent network elements to the membrane or acoustic circuit was considered. The characteristics of the trial products were as follows. 1. Axial sensitivity at 2cm distance from a simple sound source -86. 5db(1, 000c/s) 2. Axial response at 2cm distance from a simple sound source 50〜15, 000c/s ±5db 3. Directional response pattern bidirectional 4. Output impedance 600Ω(1, 000c/s) 5. Dimensions Microphone unit about 30φ×25mm^3 acoustic pipe length 170mm 6. Weight(without the cap) 100gr.

収録刊行物

  • 日本音響学会誌

    日本音響学会誌 20 (4), 249-260, 1964

    一般社団法人 日本音響学会

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