抄録
This paper describes the design method and the conditions for miniaturizing the diaphragm area of a DC biased and electret directional condenser microphone, that is, the most important things in order to miniaturize the microphone. First, the relation between the diaphragm area and the major characteristics of the microphone, that is, the frequency range, stability, inherent noise, nonlinear distortion and dynamic range is theoretically analyzed. On the basis of the results obtained, the design formulas are derived, by which the minimum effective area of the diaphragm to satisfy the desired fundamental characteristics mentioned above.
