Invention Grant
- Patent Title: Microphone assembly with digital feedback loop
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Application No.: US17130535Application Date: 2020-12-22
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Publication No.: US11323805B2Publication Date: 2022-05-03
- Inventor: Mohammad Shajaan , Claus Erdmann Fürst , Per Flemming Høvesten , Kim Spetzler Berthelsen , Henrik Thomsen
- Applicant: Knowles Electronics, LLC
- Applicant Address: US IL Itasca
- Assignee: Knowles Electronics, LLC
- Current Assignee: Knowles Electronics, LLC
- Current Assignee Address: US IL Itasca
- Agency: Foley & Lardner LLP
- Main IPC: H04R3/02
- IPC: H04R3/02 ; H04R3/04 ; H03F3/70 ; H03F3/34 ; H03G3/30 ; H04R1/04 ; H03M3/00 ; H03M1/18

Abstract:
A microphone assembly includes a transducer element and a processing circuit. The processing circuit includes an analog-to-digital converter (ADC) configured to receive, sample and quantize a microphone signal generated by the transducer element to generate a corresponding digital microphone signal. The processing circuit includes a feedback path including a digital loop filter configured to receive and filter the digital microphone signal to provide a first digital feedback signal and a digital-to-analog converter (DAC) configured to convert the first digital feedback signal into a corresponding analog feedback signal. The processing circuit additionally includes a summing node at the transducer output configured to combine the microphone signal and the analog feedback signal.
Public/Granted literature
- US20210112337A1 MICROPHONE ASSEMBLY WITH DIGITAL FEEDBACK LOOP Public/Granted day:2021-04-15
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