Ear defender with concha simulator
A hearing protection system with talk-through having a pair of rigid earcups enclosing a microphone, amplifier and speaker. A concha simulator, having a volume simulating that of the concha of a human ear, is acoustically coupled to the microphone, and also to the outside through an opening in the earcup. By coupling the microphone to the concha simulator, instead of directly to the outside, the acoustic response of the talk-through more accurately represents the hearing of a user.
1. A hearing protection system with talk-through, comprising a pair of earcups, each earcup comprising:
a) a rigid earcup shell;
b) a concha simulator within the earcup shell, comprising a volume between 2.32 cc and 6.17 cc simulating a volume of a concha of a human ear, coupled to an opening in the rigid earcup shell;
c) a microphone acoustically coupled to the concha simulator;
d) an amplifier coupled to the microphone; and
e) an audio transducer coupled to the amplifier to generate sound in a user's ear canal.
2. The hearing protection system of claim 1 , in which the microphone is inside the concha simulator.
3. The hearing protection system of claim 1 , in which the microphone is outside the concha simulator, acoustically coupled to the concha simulator through a tube.
4. The hearing protection system of claim 3 , in which the tube is flexible.
5. The hearing protection system of claim 3 , in which the tube is horn-shaped.
6. The hearing protection system of claim 1 , further comprising a screen on an outside of the concha simulator, over the opening in the earcup shell.
7. The hearing protection system of claim 1 , further comprising a gas-permeable membrane inside the opening of the earcup shell.
8. The hearing protection system of claim 7 , in which the membrane is made of a material selected from a group consisting of expanded PTFE material, PET-nonwoven material, polyester, cellulose, nylon and cloth.
9. The hearing protection system of claim 1 , in which the concha simulator contains acoustic foam.
10. The hearing protection system of claim 1 , in which the volume of the concha simulator is approximately 4.30 cc.