Insert earphone assembly for audiometric testing and method for making same
An improved insert earphone for audiometric testing is provided, having a housing, a receiver located within the housing, a flexible eartip located externally to the housing, and a tube nipple acoustically coupled between the receiver and the flexible eartip. The flexible eartip has a flexible tube portion that is coupled to an output end of the tube nipple, which may be rigid. The housing and tube nipple are configured and arranged such that the angle between a longitudinal axis of the tube nipple and the vertical axis is obtuse, minimizing the stress on the ear canal when the flexible eartip is inserted therein. An acoustic damper may be located at or near the input end of the tube nipple to prevent ear wax from clogging the damper and minimize the need for damper replacement.
1. An insert earphone comprising:
a housing;
a receiver located in the housing and having an output port, the receiver for electrically coupling with an audio signal source;
a flexible eartip for acoustic sealing with an ear canal of a user, the flexible eartip having a foam eartip portion and a flexible tube portion; and
a tube nipple providing an acoustic pathway through at least one wall of the housing and having a first end and a second end, the first end of the tube nipple being located within the housing and being acoustically coupled to the output port of the receiver and the second end of the tube nipple being located externally to the housing and being acoustically coupled to the flexible tube portion of the flexible eartip,
wherein the earphone providing a response that is approximately 0 dB relative to a response of the TDH-39 standard at one or both of 6 kHz and 8 kHz.
2. The insert earphone of claim 1 wherein the second end of the tube nipple is positioned within the flexible tube portion of the flexible eartip.
3. The insert earphone of claim 1 , the tube nipple and the housing being configured and arranged to form an obtuse angle between a longitudinal axis of the tube nipple and a vertical axis of the housing, wherein the housing hangs approximately vertically along the side of a user's head when worn.
4. The insert earphone of claim 3 wherein the angle is approximately 118 degrees.
5. The insert earphone of claim 1 , comprising a flexible channel located between the output port of the receiver and the first end of the tube nipple.
6. The insert earphone of claim 5 wherein the flexible channel has a first end and a second end, and wherein the first end of the flexible channel is coupled to the output port of the receiver and the second end of the flexible channel is coupled to the first end of the tube nipple.
7. The insert earphone of claim 1 , comprising an acoustic damper located in the tube nipple proximate the first end of the tube nipple.
8. An insert earphone comprising:
a housing;
a receiver located in the housing and having an output port, the receiver for electrically coupling with an audio signal source;
a flexible eartip for acoustic sealing with ear canal of a user;
a tube nipple having a first end and a second end, the first end located within the housing and acoustically coupled to the output port of the receiver and the second end located externally to the housing and acoustically coupled to the flexible eartip; and
an acoustic damper located in the tube nipple proximate the first end of the tube nipple,
wherein the insert earphone is inserted at least partially into the ear canal and is supported entirely by the ear canal when worn by the user.
9. The insert earphone of claim 8 , the tube nipple and the housing being configured and arranged to form an obtuse angle between a longitudinal axis of the tube nipple and a vertical axis of the housing, wherein the housing hangs approximately vertically along the side of a user's head when worn.
10. The insert earphone of claim 9 wherein the angle is approximately 118 degrees.
11. The insert earphone of claim 8 wherein the flexible eartip comprises a flexible tube portion and a foam eartip portion, and wherein at least a portion of the flexible tube portion extends through the foam eartip portion.
12. The insert earphone of claim 11 wherein the tube nipple is rigid and wherein the second end of the tube nipple is positioned within the flexible tube portion of the flexible eartip.
13. The insert earphone of claim 8 , comprising a flexible channel located between the output port of the receiver and the first end of the tube nipple.
14. The insert earphone of claim 13 wherein the flexible channel has a first end and a second end, and wherein the first end of the flexible channel is coupled to the output port of the receiver and the second end of the flexible channel is coupled to the first end of the tube nipple.