Invention Grant
- Patent Title: Cardioid microphone adaptive filter
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Application No.: US16542654Application Date: 2019-08-16
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Publication No.: US10679640B2Publication Date: 2020-06-09
- Inventor: Kevin Shank
- Applicant: HARMAN INTERNATIONAL INDUSTRIES, INCORPORATED
- Applicant Address: US CT Stamford
- Assignee: Harman International Industries, Incorporated
- Current Assignee: Harman International Industries, Incorporated
- Current Assignee Address: US CT Stamford
- Agency: Brooks Kushman P.C.
- Main IPC: G10L21/0232
- IPC: G10L21/0232 ; H04R3/00 ; H04R1/08 ; H04R1/24 ; H04R1/40 ; G10L21/0216

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.
Public/Granted literature
- US20200058315A1 CARDIOID MICROPHONE ADAPTIVE FILTER Public/Granted day:2020-02-20
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