EYEGLASSES WITH A PLANAR ARRAY OF MICROPHONES FOR ASSISTING HEARING
An apparatus implements directional sound detection. The apparatus includes a portable hearing aid device, a plurality of sound detectors, and electronic circuitry. The sound detectors are coupled to the portable hearing aid device. The sound detectors are arranged in a substantially planar array which is located in approximately a two-dimensional plane which extends through both a listener position and a sound generator position. The electronic circuitry is electronically coupled to the plurality of sound detectors. The electronic circuitry generates a reproduced sound signal based on sound signals from at least a subset of the plurality of sound detectors. The subset includes at least two sound detectors in a one-dimensional line and at least one sound detector located within the two-dimensional plane other than along the one-dimensional line.
1 . An apparatus for directional sound detection, the apparatus comprising:
a portable hearing aid device;
a plurality of sound detectors coupled to the portable hearing aid device, wherein the sound detectors are arranged in a substantially planar array which is located in approximately a two-dimensional plane which extends through both a listener position and a sound generator position; and
electronic circuitry electronically coupled to the plurality of sound detectors, wherein the electronic circuitry is configured to generate a reproduced sound signal based on sound signals from at least a subset of the plurality of sound detectors, wherein the subset comprises at least two sound detectors in a one-dimensional line and at least one sound detector located within the two-dimensional plane other than along the one-dimensional line.
2 . The apparatus of claim 1 , wherein the subset of the sound detectors comprises at least three sound detectors, and the electronic circuitry is configured to combine the sound signals to generate the reproduced sound signal based on a first-order steerable superdirectional response using the sound signals from the at least three sound detectors.
3 . The apparatus of claim 1 , wherein the subset of the sound detectors comprises at least four sound detectors, and the electronic circuitry is configured to combine the sound signals to generate the reproduced sound signal based on a second-order steerable superdirectional response using the sound signals from the at least four sound detectors.
4 . The apparatus of claim 1 , wherein the electronic circuitry is configured to combine the sound signals from the subset of the sound detectors to generate substantially a unity response at a listening angle toward the sound generator position.
5 . The apparatus of claim 1 , wherein the electronic circuitry is configured to combine the sound signals from the subset of the sound detectors to generate substantially a null response at an interference angle toward an interference sound position.
6 . The apparatus of claim 1 , further comprising an audio speaker coupled to the electronic circuitry, wherein the audio speaker is configured to generate an audible sound representative of the reproduced sound signal.
7 . The apparatus of claim 1 , wherein the electronic circuitry comprises a digital signal processor (DSP).
8 . The apparatus of claim 7 , wherein the electronic circuitry further comprises:
an analog-to-digital converter (ADC) coupled to the digital signal processor, wherein the analog-to-digital converter is configured to generate digital representations of the sound signals from the sound detectors; and
a digital-to-analog converter (DAC) coupled to the digital signal processor, wherein the digital-to-analog converter is configured to generate an analog representation of the reproduced sound signal.
9 . The apparatus of claim 7 , wherein the electronic circuitry comprises a controller to control a directivity angle of a superdirectional response based on the sound signals from the sound detectors.
10 . A pair of hearing glasses comprising:
a pair of optical elements;
a frame comprising a front portion and two stems, wherein the front portion is configured to hold the pair of optical elements, and the stems are configured to hold the frame in a position relative to a user's head; and
a hearing aid device coupled to the frame, wherein the hearing aid device comprises:
a planar array of at least three sound detectors, wherein at least one sound detector is coupled to the front portion of the frame, and at least one sound detector is coupled to one of the stems; and
electronic circuitry electronically coupled to the planar array of sound detectors and configured to generate a reproduced sound signal based on sound signals from the planar array of sound detectors.
11 . The pair of hearing glasses of claim 10 , wherein the electronic circuitry is configured to combine the sound signals to generate the reproduced sound signal based on a first-order steerable superdirectional response using the at least three sound detectors.
12 . The pair of hearing glasses of claim 10 , wherein the planar array comprises at least four sound detectors, wherein the electronic circuitry is configured to combine the sound signals to generate the reproduced sound signal based on a second-order steerable superdirectional response using the at least four sound detectors.
13 . The pair of hearing glasses of claim 10 , wherein the electronic circuitry further comprises:
a digital signal processor (DSP) to digitally process the sound signals from the planar array of sound detectors to generate the reproduced sound signal; and
an audio speaker coupled to the digital signal processor, wherein the audio speaker is configured to generate an audible sound representative of the reproduced sound signal.
14 . The pair of hearing glasses of claim 13 , wherein the audio speaker comprises a personal audio speaker to generate the audible sound with sound wave characteristics that allow the audible sound to be heard primarily within the vicinity of a user's ear.
15 . The pair of hearing glasses of claim 10 , wherein the electronic circuitry further comprises a controller to control a directivity angle of a superdirectional response based on the sound signals from the sound detectors.
16 . The pair of hearing glasses of claim 10 , wherein the electronic circuitry further comprises a controller allow a user to select between one of a plurality of operating modes, wherein the operating modes comprise:
a planar array operating mode in which the electronic circuitry is configured to generate the reproduced sound signal based on sound signals from the planar array of sound detectors; and
a line array operating mode in which the electronic circuitry is configured to generate another reproduced sound signal based on sound signals from a line array of a plurality of sound detectors arranged in a line array configuration within the planar array.
17 . The pair of hearing glasses of claim 10 , wherein the electronic circuitry is configured to combine the sound signals from the planar array of sound detectors to generate substantially a unity response at a listening angle toward a position of a sound generator and to place substantially a null response at an interference angle toward a position of an interference sound source.
18 . A method for controlling directivity of a hearing aid device, the method comprising:
detecting sound waves at a plurality of sound detectors coupled to a portable hearing aid device, wherein the sound detectors are arranged in a substantially planar array which is located in approximately a two-dimensional plane which extends through both a listener position and a sound generator position;
generating a reproduced sound signal based on sound signals from at least a subset of the plurality of sound detectors, wherein the subset comprises at least two sound detectors in a one-dimensional line and at least one sound detector located within the two-dimensional plane other than along the one-dimensional line; and
generating an audible sound representative of the reproduced sound signal and communicating the audible sound to a user of the portable hearing aid device.
19 . The method of claim 18 , further comprising:
digitally combining the sound signals from at least four sound detectors; and
generating the reproduced sound signal based on a second-order steerable superdirectional response using the combined sound signals from the at least four sound detectors.
20 . The method of claim 19 , wherein digitally combining the sound signals from the sound detectors further comprises:
generating substantially a unity response at a listening angle toward the sound generator position; and
generating substantially a null response at an interference angle toward an interference sound position, wherein the interference angle is at approximately 45 degrees from the listening angle for a first-order response and approximately 30 degrees from the listening angle for a second-order response.