An automatic corrector for free-field microphone measurements which is devoid of errors inherent in the -feedback-type- field correction schemes has been developed. Using a standard microphone the field pressure-vs-frequency characteristic at a region is recorded together with a triggering tone for starting the oscillator. The standard microphone then is replaced with the unknown microphone. The triggering tone starts the recorder in precise frequency coincidence with the oscillator producing a graph of the true response-frequency characteristic of the unknown microphone.
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