DEVICE FOR MEASURING SOUND LEVEL

• US 20150139432A1
• Filed: 10/21/2014
• Published: 05/21/2015
• Est. Priority Date: 10/30/2013
• Status: Active Grant

• Current Assignee: SVANTEK Sp. z o.o.
• Original Assignee: SVANTEK Sp. z o.o.
• Inventors: BARWICZ, Wieslaw, LEONIAK, Ryszard, LUKASZEWSKI, Lukasz, KUZMISZYN, Grzegorz
• Granted Patent: US 9,510,117 B2
• Time in Patent Office: Days
• US Class Current: 381/56
• CPC Class Codes: H04R 1/20 Arrangements for obtaining desired frequency or directional characteristics for stereophonic purpose H04R5/00
• CPC Class Codes: H04R 1/22 for obtaining desired frequency characteristic only circuit for combining transducers having different responses H04R3/00; for hearing aids H04R25/407
• CPC Class Codes: H04R 1/222 for microphones H04R1/24, H04R1/26 take precedence
• CPC Class Codes: H04R 19/005 using semiconductor materials
• CPC Class Codes: H04R 19/04 Microphones H04R19/01 takes precedence
• CPC Class Codes: H04R 2201/003 Mems transducers or their use of the electrostatic type H04R19/005
• CPC Class Codes: H04R 29/00 Monitoring arrangements; Testing arrangements for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308
• CPC Class Codes: H04R 29/004 for microphones H04R29/007 takes precedence

Abstract

A device for measuring sound level, comprising: an inlet opening; a MEMS microphone for measuring sound level; and an external acoustic attenuator with a pressure divider comprising: a first branch between the inlet opening and the membrane of the MEMS microphone via an inlet channel and a resonant cavity; and a second branch between the resonant cavity and a vent chamber via a vent channel.

Claims

1. A device for measuring sound level, comprising:

an inlet opening;

a MEMS microphone for measuring sound level; and

an external acoustic attenuator with a pressure divider comprising;

a first branch between the inlet opening and the membrane of the MEMS microphone via an inlet channel and a resonant cavity; and

a second branch between the resonant cavity and a vent chamber via a vent channel.

2. The device according to claim 1, wherein the pressure divider comprises a double-sectional channel, having a first inlet section which constitutes a portion of the inlet channel between the inlet opening of the external acoustic attenuator and the resonant cavity, and a second vent section which constitutes a branch of the first inlet section and is connected with a vent chamber.

3. The device according to claim 2, wherein the vent channel has acoustic impedance smaller than acoustic impedance of the inlet channel.

4. The device according to claim 1, wherein the pressure divider comprises a dumping material layer mounted between the inlet opening of the external acoustic attenuator and the resonant cavity, wherein the resonant cavity splits to the inlet channel and a vent channel coupled with a vent chamber.

5. The device according to claim 1, wherein the resonant cavity is filled with a material absorbing acoustic energy.

6. The device according to claim 1, wherein it further comprises a TEDS memory storing information on the individual frequency characteristic of the device.

7. The device according to claim 1, wherein its components are positioned in a tight housing in the following order:

an inlet opening of the inlet channel, a sealing set, the pressure divider, the resonant cavity, a PCB with the MEMS microphone, the vent chamber and a PCB with connector for coupling the device with external devices.

8. A device for measuring sound level by a MEMS microphone, wherein the MEMS microphone is coupled with an external acoustic attenuator comprising a pressure divider configured to limit the acoustic pressure which reaches a membrane of the microphone from an inlet opening, wherein the pressure divider connects the inlet opening via an inlet channel and a resonant cavity to the membrane of the microphone and connects the resonant cavity via a vent channel to a vent chamber.