Cardioid microphone adaptive filter
Abstract:
Cardioid adaptive filtering includes receiving a first and second audio signals from first and second omnidirectional microphones; combining the audio input signals into a cardioid signal; filtering the cardioid signal to create a first filtered output using an adaptive low pass filter controlled by a frequency control, the adaptive low pass filter having a controllable corner frequency f1; filtering the first filtered output, using a high frequency gain filter with a corner frequency f2, to create an equalized cardioid output signal; performing feedforward processing of the audio input signals to provide a wind feedforward signal; using the equalized cardioid output and the first or second audio input signal, performing proximity feedback to generate a proximity feedback signal; adjusting the frequency f1 of the adaptive low pass filter using the wind feedforward signal and the proximity feedback signal; and providing the equalized cardioid output signal for use in receiving captured audio.
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