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acoustic overload point (AOP)

The Acoustic Overload Point (AOP) is an important characteristic value of microphones. It refers to the sound pressure level (SPL) and stands for the acoustic overload point.

The AOP overload defines a sound pressure level at which the resulting distortion factor reaches a value of 10%. This measurement is used for evaluating microphone performance at high sound pressure levels and when background noise is a strong influence.

At the acoustic clipping point, the sound sensors of the microphones can no longer separate the sound signal from interfering signals such as noise and operate relatively inefficiently. To improve the ratio between sound signal and interfering background noise, microphones in smartphones, hearing aids, studios, digital voice assistants, or in voice user interfaces (VUI) use different microphone technologies, such as MEMS microphones that have good AOP values, different audio reception techniques such as beamforming, circuit techniques with noise filters, and signal processing techniques with AOP algorithms and noise reduction.

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Englisch: acoustic overload point - AOP
Updated at: 29.09.2020
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