Microphone test procedure

摘要

In one embodiment, the invention is a microphone system with an internal test circuit. The system includes a microphone having a housing with an acoustic port, a first transducer, a second transducer, a controller, and a current source. The system also includes an acoustic assembly with a cover and an acoustic pressure source positioned in the cover. When the acoustic assembly is positioned over the acoustic port, an acoustic chamber is formed, and a signal can be applied to the acoustic pressure source such that a first set of measurements can be taken. The acoustic assembly can be removed and replaced with an acoustic cover to take a second set of measurements. Based on the first and second measurements, sensitivities of the first and second transducers can be determined. In another embodiment, the invention provides a method for calibrating the sensitivity of a microphone.

主权项

1. A microphone test arrangement, comprising:
a microphone having
a housing having an acoustic port,an acoustic pressure source positioned in a cover, such that the acoustic pressure source and the cover comprise an acoustic pressure source assembly,a first transducer,a second transducer,a controller, anda current source;an acoustic port cover; wherein the acoustic pressure source assembly is positioned over the acoustic port forming an acoustic chamber and a first signal is applied to the acoustic pressure source and a first set of measurements are taken, the acoustic pressure source assembly is removed and the acoustic port cover is positioned over the acoustic port and a second signal is applied to the one of the first transducer and the second transducer and a second set of measurements are taken; and wherein a first sensitivity of the first transducer and a second sensitivity of the second transducer are determined from the first and second set of measurements.