½-inch Diffuse-field Microphone, Externally Polarized

USE SCENARIOS

• Diffuse-field measurements
• In-car measurement
• High humidity environments

USE OF DIFFUSE-FIELD MICROPHONES

A diffuse-field microphone, also called a random-incidence microphone, is designed to have a uniform response when signals arrive simultaneously from all angles. They should therefore not only be used for measurement in reverberation chambers, but in all situations where the sound field is diffuse, or where several sources are contributing to the sound pressure at the measurement position. Practical examples are indoor situations, where the sound is reflected by walls, ceilings, and objects in the room, or measurements inside a car.

ROBUSTNESS

The microphone is capable of withstanding the IEC 68-2-32 1 metre drop test. 

CALIBRATION

The sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4228 with ½-inch Adaptor DP 0776, or at 1 kHz using Sound Level Calibrator Type 4231. For calibration at other frequencies use Multifunction Acoustic Calibrator Type 4226. The actuator response can be measured using Actuator UA 0033. The random-incidence response can be obtained by adding the type-specific, random-incidence correction to the actuator response.