Antihowling hearing aid
First Claim
Patent Images
1. A hearing aid comprising;
- a microphone, an amplifier having a first input coupled to the microphone and an output coupled to a receiver, and means for suppressing unwanted feedback phenomena in the hearing aid including a second microphone which is only sensitive to sound close to it and is coupled to a second input of the amplifier, both said microphones being coupled to their respective inputs of the amplifier such that, when output signals of the two microphones are applied to the respective amplifier inputs, the amplifier substantially does not produce an output signal for components of said output signals produced by sound close to the second microphone.
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Accused Products
Abstract
In order to prevent howling in a hearing aid (10) having a microphone (1), an amplifier (3) and a receiver (4) the hearing aid is provided with a second microphone (2) which is only sensitive to sound near to it. The microphones (1, 2) are connected to the amplifier (3) in anti-phase relative to each other.
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Citations
18 Claims
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1. A hearing aid comprising;
- a microphone, an amplifier having a first input coupled to the microphone and an output coupled to a receiver, and means for suppressing unwanted feedback phenomena in the hearing aid including a second microphone which is only sensitive to sound close to it and is coupled to a second input of the amplifier, both said microphones being coupled to their respective inputs of the amplifier such that, when output signals of the two microphones are applied to the respective amplifier inputs, the amplifier substantially does not produce an output signal for components of said output signals produced by sound close to the second microphone.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A hearing aid comprising:
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a first microphone sensitive to sounds originating both from a remote point and from a nearby point, a second microphone, different from the first microphone, and sensitive only to sounds originating from the nearby point, amplifier means having first and second inputs coupled to respective outputs of the first and second microphones, and having an output coupled to an electro-acoustic transducer, said amplifier means being operative to combine in a mutually neutralizing relationship first and second output signals received from the respective outputs of the first and second microphones such that a component of the output signal of the first microphone due to sounds received from the nearby point are cancelled out by the output signal of the second microphone which is due only to sounds received from said nearby point, whereby the electro-acoustic transducer develops an acoustic output substantially devoid of signal components due to sounds received from the nearby point. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification