Microphone With Electronic Noise Filter

• US 20160133271A1
• Filed: 10/29/2015
• Published: 05/12/2016
• Est. Priority Date: 11/11/2014
• Status: Abandoned Application

• Current Assignee: Knowles Electronics Llc (Knowles Corporation)
• Original Assignee: Knowles Electronics Llc (Knowles Corporation)
• Inventors: Kuntzman, Michael
• Application Number:
  US14/926,703
• Publication Number:
  US 20160133271A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H03F 2200/03 the amplifier being designed for audio applications
• CPC Class Codes: H03F 2200/165 A filter circuit coupled to the input of an amplifier
• CPC Class Codes: H03F 2200/372 Noise reduction and elimination in amplifier
• CPC Class Codes: H03F 3/183 with semiconductor devices only
• CPC Class Codes: H03F 3/187 in integrated circuits
• CPC Class Codes: H04R 19/005 using semiconductor materials
• CPC Class Codes: H04R 19/04 Microphones H04R19/01 takes precedence
• CPC Class Codes: H04R 3/06 of electrostatic transducers

Abstract

An acoustic apparatus includes a microelectromechanical system (MEMS) device, a controlled filter coupled to the MEMS device, and an amplifier. The controllable filter and the amplifier are coupled together at a node. A cut-off frequency of the filter is selectable based upon reception or non-reception of a low frequency audio signal by the acoustic apparatus.

Claims

1. An acoustic apparatus, comprising:

a microelectromechanical system (MEMS) device;

a controlled filter coupled to the MEMS device;

an amplifier;

wherein the controllable filter and the amplifier are coupled together at a node;

wherein a cut-off frequency of the filter is selectable based upon reception or non-reception of a low frequency audio signal by the acoustic apparatus.

2. The acoustic apparatus of claim 1, wherein the low frequency audio signal has a frequency of less than 1000 HZ.

3. The acoustic apparatus of claim 1, wherein the controllable filter comprises a high pass filter.

4. The acoustic apparatus of claim 1, wherein the controllable filter is controlled by a switch, the switch selectively activating the controllable filter.

5. The acoustic apparatus of claim 4, wherein the switch is controlled by a processor.

6. The acoustic apparatus of claim 5, wherein the processor is coupled to a sensor, and wherein the sensor selectively receives the low frequency audio signal.

7. The acoustic apparatus of claim 6, wherein the low frequency audio signal is wind.

8. The acoustic apparatus of claim 1, wherein the controllable filter comprising at least one resistor and at least one capacitor.