Active noise cancelling earbud devices
Systems and methods for audio listening devices, comprise a speaker coupled to a first housing, a sound port having a first end and a second end, wherein the first end is coupled to the first housing, and the second end is configured to be inserted in an ear canal of a person such that sound waves emitted from the speaker propagates via a secondary path to the ear canal through the sound port, active noise cancellation (ANC) components configured to generate anti-noise signals through the micro-speakers to cancel external noise, and a first microphone disposed within the sound port at the second end of the sound port such that the first microphone is configured to detect the anti-noise signal that propagates through the sound port via the secondary path and the external noise that propagates via a primary path.
1. A device comprising:
a speaker coupled to a first housing;
a sound port having a first end and a second end, wherein:
the first end is coupled to the first housing,
the second end is configured to be inserted in an ear canal of a person such that sound waves emitted from the speaker propagate via a secondary path to the ear canal through the sound port, and
the sound port comprises a straight channel;
active noise cancellation (ANC) components configured to generate an anti-noise signal through the speaker to cancel an external noise; and
a first microphone disposed within the sound port at the second end of the sound port such that the first microphone is configured to detect the anti-noise signal that propagates through the sound port via the secondary path and the external noise that propagates via a primary path, where the first microphone is recessed within a notch in the straight channel of the sound port.
2. The device of claim 1 , further comprising a second housing coupled to the first housing, wherein the second housing comprises an acoustic chamber for a micro-speaker back-cavity.
3. The device of claim 2 , wherein the second housing further comprises a second microphone configured to detect the external noise.
4. The device of claim 2 , further comprising a third housing coupled to the second housing, wherein the third housing comprises a second microphone configured to detect the external noise.
5. The device of claim 1 , wherein the ANC components comprise analog ANC filters.
6. The device of claim 1 , wherein the ANC components comprise digital ANC filters.
7. The device of claim 1 , wherein the ANC components comprise feedforward ANC components.
8. The device of claim 1 , wherein the ANC components comprise feedback ANC components.
9. The device of claim 1 , wherein the ANC components comprise hybrid ANC components.
10. The device of claim 1 , wherein the first microphone comprises a tube having a first end disposed at or adjacent to an external end of the sound port.
11. The device of claim 1 , wherein the ANC components are further configured to define a virtual error microphone location and generate the anti-noise signal to cancel the external noise at the virtual error microphone location.
12. A method comprising:
coupling a speaker to a first housing;
attaching a sound port to the first housing, the sound port having a first end and a second end, wherein the first end is coupled to the first housing, and the second end is configured to be inserted in an ear canal of a person such that sound waves emitted from the speaker propagate via a secondary path to the ear canal through the sound port, and wherein the sound port comprises a straight channel;
generating an anti-noise signal through the speaker to cancel external noise; and
detecting, using an error microphone, the anti-noise signal that propagates through the sound port via the secondary path and the external noise that propagates via a primary path, the error microphone being recessed within a notch in the straight channel of the sound port.
13. The method of claim 12 , further comprising coupling a second housing to the first housing, wherein the second housing comprises an acoustic chamber for a micro-speaker back-cavity.
14. The method of claim 13 , further comprising disposing a second microphone in the second housing, the second microphone configured to detect external noise.
15. The method of claim 14 , further comprising a third housing coupled to the second housing, wherein the third housing comprises a second microphone configured to detect external noise.
16. The method of claim 12 , wherein the error microphone generates an error signal corresponding to the anti-noise signal and external noise, and processes the error signal through active noise cancellation (ANC) components comprising analog ANC filters and/or digital ANC filters.
17. The method of claim 16 , wherein the ANC components comprise feedforward ANC components, feedback ANC components and/or hybrid ANC components.
18. The method of claim 16 , wherein the ANC components are further configured to define a virtual error microphone location and generate the anti-noise signal to cancel the external noise at the virtual error microphone location.