Headset porting

Patent metadata

Field	Value
Publication number	US-10009681-B2
Application number	US-201715700306-A
Country	US
Kind code	B2
Filing date	Sep 11, 2017
Priority date	Mar 26, 2013
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A headset cup having a front cavity and a rear cavity separated by a driver, with a mass port tube connected to the rear port to present a reactive acoustic impedance to the rear cavity, in parallel with a resistive port, the total acoustic response of the rear cavity remaining linear at high power levels. In some embodiments, the mass port tube is made of metal, while the headset cup is otherwise made of plastic.

First claim

What is claimed is:

1. An around-the-ear headset cup comprising:
a front cavity;
a rear cavity;
a driver disposed between the front cavity and the rear cavity, the driver configured to radiate sound pressure levels larger than 120 dB; and
a first port connected to the rear cavity, the first port being configured such that a resistive component of an acoustic impedance of the first port is larger than a reactive component of the acoustic impedance of the first port; and
a second port connected to the rear cavity such that an acoustic impedance of the second port is parallel to the acoustic impedance of the first port, the second port being configured such that a reactive component of the acoustic impedance of the second port is larger than a resistive component of the acoustic impedance of the second port, and a frequency response of the rear cavity at frequencies less than 100 Hz is substantially invariant with respect to input power levels for the driver less than or substantially equal to 100 mW.

2. The headset cup of claim 1 , wherein the driver is configured to radiate sound pressure levels larger than 135 dB.

3. The headset cup of claim 1 , wherein the second port comprises a tube about 37 mm long.

4. The headset cup of claim 3 , wherein the tube has a cross-sectional area of about 9 mm 2 .

5. The headset cup of claim 1 , wherein the second port comprises a tube having a length-to-inside diameter ratio of about 10:1.

6. The headset cup of claim 1 , wherein the rear cavity is constructed from plastic and the second port comprises a metal tube.

7. The headset cup of claim 6 , wherein the metal tube is a stainless steel tube.

8. The headset cup of claim 1 , wherein the first port includes a resistive screen.

9. The headset cup of claim 1 , wherein the second port extends outside the rear cavity.

10. The headset cup of claim 1 , wherein the second port comprises a metal tube seated inside a wall of the rear cavity.

11. The headset cup of claim 1 , wherein a ratio of a volume enclosed by the rear cavity to a volume enclosed by the second port is in the range 27:1-40:1, the volume enclosed by the rear cavity not including the volume enclosed by the second port.

12. The headset cup of claim 1 , further comprising an active noise reduction circuit coupled to the driver.

13. A headset comprising,
at least one around-the-ear cup having a front cavity and rear cavity;
a driver configured to radiate sound pressure levels larger than 120 dB, the driver disposed between said front and rear cavities,
wherein the ear cup comprises:
a first port connected to the rear cavity, the first port being configured such that a resistive component of an acoustic impedance of the first port is larger than a reactive component of the acoustic impedance of the first port, and
a second port comprising a tube having an inside surface that is substantially smooth, the second port connected to the rear cavity such that an acoustic impedance of the second port is parallel to the acoustic impedance of the first port, the second port being configured such that a reactive component of the acoustic impedance of the second port is larger than a resistive component of the acoustic impedance of the second port, and a frequency response of the rear cavity at frequencies less than 100 Hz is substantially invariant with respect to input power levels for the driver less than or substantially equal to 100 mW; and
an active noise reduction system coupled to the driver.

14. The headset of claim 13 , wherein the tube has a length-to-inside diameter ratio of about 10:1.

15. The headset of claim 13 , wherein the rear cavity is constructed from plastic and the tube is a metal tube.

16. The headset of claim 13 , wherein a ratio of a volume enclosed by the rear cavity to a volume enclosed by the second port is in the range 27:1-40:1, the volume enclosed by the rear cavity not including the volume enclosed by the second port.

17. An apparatus comprising:
a first around-the-ear cup shell of a headphone;
a second around-the-ear cup shell of the headphone;
an electroacoustic driver configured to radiate sound pressure levels larger than 120 dB, the electroacoustic driver disposed between the first and second around-the-ear cup shells, such that the first around-the-ear cup shell and a first face of the driver define a front cavity, and the second around-the-ear cup shell and a second face of the driver define a rear cavity;
a metal tube having an internal bore with substantially uniform cross section, the metal tube seated in the second ear cup shell and coupling the rear cavity to space around the apparatus, the metal tube configured such that a reactive component of the acoustic impedance of the metal tube is larger than a resistive component of the acoustic impedance of the metal tube, and a frequency response of the rear cavity at frequencies less than 100 Hz is substantially invariant with respect to input power levels for the electroacoustic driver less than or substantially equal to 100 mW,
wherein the second around-the-ear cup shell comprises plastic, and the metal tube comprises a rough exterior surface at one end, the rough exterior surface being anchored in the plastic of the second around-the-ear cup shell.

18. The apparatus of claim 17 , wherein the metal tube has a length-to-inside diameter ratio of about 10:1.

19. The apparatus of claim 17 , wherein a ratio of a volume enclosed by the rear cavity to a volume enclosed by the metal tube is in the range 27:1-40:1, the volume enclosed by the rear cavity not including the volume enclosed by the metal tube.

20. The apparatus of claim 17 , wherein the metal tube is a stainless steel tube.

Assignees

• Bose Corp

Inventors

• Sapiejewski Roman
• Belanger Robert
• Taylor Tristan Edward

Classifications

• G10K2210/3214

  Architectures, e.g. special constructional features or arrangements of features · CPC title

• H04R2201/105

  Manufacture of mono- or stereophonic headphone components · CPC title

• H04R1/1083

  Reduction of ambient noise (active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06) · CPC title

• H04R1/1008

  Earpieces of the supra-aural or circum-aural type · CPC title

• H04R1/2823

  Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material · CPC title