In the ear hearing aid having extraction tube which reduces acoustic feedback
First Claim
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1. A hearing aid intended for placement within an ear canal, comprising:
- a microphone, an amplifier and an electromechanical transducer coupled together in cascade and accommodated within a housing, and an extraction means for extracting the hearing aid from the ear canal, the input to the microphone being acoustically coupled to a sound entrance in the housing, wherein the extraction means comprises a hollow acoustic tube having one end located at the sound entrance of the housing and mechanically coupled to the housing so that the sound entrance is acoustically coupled to a channel in the acoustic tube.
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Abstract
An in-the-ear canal hearing aid comprises a housing which accommodates a microphone, an amplifier and an electromechanical transducer (for example, of a telephone) which are electrically coupled together in cascade. The hearing aid further includes an extraction element for extracting the hearing aid from the ear canal. The extraction element is in the form of a hollow tube having one end mechanically attached to the housing of the hearing aid at such a position that the channel in the tube is acoustically coupled to the sound entrance of the hearing aid. As a result, a second function of the extraction element is the suppression of acoustic feedback.
71 Citations
19 Claims
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1. A hearing aid intended for placement within an ear canal, comprising:
- a microphone, an amplifier and an electromechanical transducer coupled together in cascade and accommodated within a housing, and an extraction means for extracting the hearing aid from the ear canal, the input to the microphone being acoustically coupled to a sound entrance in the housing, wherein the extraction means comprises a hollow acoustic tube having one end located at the sound entrance of the housing and mechanically coupled to the housing so that the sound entrance is acoustically coupled to a channel in the acoustic tube.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An in-the-ear hearing aid comprising:
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a housing having a sound entrance, a microphone, an amplifier and an electromagnetic transducer electrically coupled together in cascade and mounted within said housing and with an input of the microphone acoustically coupled to the sound entrance of the housing, and means for extracting the hearing aid from an ear canal, wherein said extracting means comprises a hollow tube forming an acoustic channel and with one end of the hollow tube mechanically coupled to the housing at the sound entrance so that the sound entrance is acoustically coupled to the acoustic channel in the hollow tube and is sealed off from sound waves other than those received by the acoustic channel in the hollow tube. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification