VELOCITY MICROPHONES 



193 



3 4 S 5 78 9 



3 4 5 6 789 



X 



3 4 5 6 7 8 9 



Fig. 9.11. Computed open circuit voltage response frequency characteristic of a pressure 

 gradient, mass controlled, electrodynamic microphone. 



Fig. 9.12. Directional characteristics of a pressure gradient microphone as a function of the 

 dimensions and the wavelength. The polar graph depicts the output, in volts, as a function 

 of the angle, in degrees. The maximum response is arbitrarily chosen as unity. 



