Abstract
A carrier microphone system has been developed for measuring very low sound pressure levels over a bandwidth from static pressure to 100 000 cps. The system is suitable for use with conventional condenser microphones and other types of capacitive transducers. This paper discusses (1) the problems of carrier systems vs direct bias systems in achieving low noise in the low- and high-frequency region, (2) a method of using tuned circuits at the carrier frequency without restricting the input bandwidth to the Q of the individual tuned circuits, and (3) the use of electrostatic methods of actuation to obtain equivalent pressure calibration in a carrier system. An equivalent acoustic noise floor less than Fletcher's minimum audible field curve over the entire audio bandwidth has been achieved. Pressure calibration of condenser microphones to 100 kc has been accomplished with the system described. (This work was supported in part by a U. S. Air Force contract.)
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