A system and method for directional sound sensing directs an optical sensing beam to an object of interest having a rough surface that vibrates acoustically. The light is reflected thereby and scattered as a speckle pattern that includes multiple speckles having a random distribution of phase offset
A system and method for directional sound sensing directs an optical sensing beam to an object of interest having a rough surface that vibrates acoustically. The light is reflected thereby and scattered as a speckle pattern that includes multiple speckles having a random distribution of phase offsets. A detector array having multiple detector elements receives and detects the speckle pattern and produces signals that are linearly proportional to phase modulation of the speckles. A summer receives signals from at least two of the detector elements that are offset at different phases and sums the received signals to generate a non-vanishing signal representative of an acoustic signal.
대표청구항▼
1. An optical pin-point microphone comprising: a light source, the light source directs a sensing light beam to an object of interest, the object of interest being a person generating a sound and having a rough surface, wherein the rough surface vibrates acoustically and is the person's skin, the ro
1. An optical pin-point microphone comprising: a light source, the light source directs a sensing light beam to an object of interest, the object of interest being a person generating a sound and having a rough surface, wherein the rough surface vibrates acoustically and is the person's skin, the rough surface reflects and scatters the sensing light, the scattered, reflected sensing light has a speckle pattern comprising multiple speckles, the multiple speckles have a random distribution of phase offsets;a first detector array comprised of multiple detector elements, the first detector array receives and detects the speckle pattern, and each of the multiple detector elements produces a first signal that is linearly proportional to phase modulation of the multiple speckles; anda summer that: (a) receives the first signal from at least two of the multiple detector elements of the first detector array and each first signal is offset at different phases, and (b) sums the received first signals, and (c) generates a non-vanishing signal that represents an acoustic signal. 2. The optical pin-point microphone of claim 1, wherein the summer receives the first signal from at least four of the multiple detector elements of the first detector array. 3. The optical pin-point microphone of claim 1, wherein the scattered, reflected sensing light comprises two polarization states and there is further included a polarization splitter, the polarization splitter: (a) receives the speckles from the scattered, reflected sensing light and (b) directs the speckles of the scattered, reflected sensing light to a second detector array according to the speckle's polarization state, said second detector array comprised of multiple detector elements. 4. The optical pin-point microphone of claim 3, wherein the summer receives the signals in each of the polarization states from at least four detector elements in each of the first and second detector arrays. 5. The optical pin-point microphone of claim 1, wherein the speckle pattern comprises at least two wavelengths, each incident on a respective detector array for each of which the signals of at least two detector elements are detected, amplified and summed to generate the non-vanishing signal. 6. The optical pin-point microphone of claim 5, wherein the summer receives respective signals at each wavelength from at least four detector elements on each of the respective detector arrays. 7. A high-fidelity acoustic system comprising: the optical pin-point microphone of claim 1,at least one acoustic microphone, andmeans for fusing respective signals output by the optical pin-point microphone and the at least one acoustic microphone so as to generate a high-fidelity sound with strong background noise suppression. 8. A wearable hearing aid device comprising the optical pin-point microphone according to claim 1 that, detects voice vibrations off a person's head, converts the voice vibrations into a voice signal and transmits the sound, after amplification to the user's ear. 9. The device of claim 8, wherein the sensing beam of the optical pin-point microphone is in the visible spectrum. 10. The device of claim 8, wherein the sensing beam of the optical pin-point microphone is outside the visible spectrum, and the device includes a mechanical aiming component. 11. The device of claim 8, wherein the sensing beam is outside the visible spectrum, and the device includes an optical aiming component. 12. The device of claim 8, wherein the sensing beam is outside the visible spectrum, and the light source produces a weak visible aiming beam. 13. A method for detecting vibrations off non-specular surfaces, the method comprising the steps of: directing a sensing light beam to an object of interest, the object of interest being a person generating a sound and having a rough surface, wherein the rough surface vibrates acoustically and is the person's skin,the rough surface reflects and scatters the sensing light, the scattered, reflected sensing light has a speckle pattern comprising multiple speckles, the multiple speckles have a random distribution of phase offsets;intercepting the speckle pattern by a first detector array comprising multiple detector elements, each of the multiple detector elements produces a first signal that is linearly proportional to phase modulation of speckles in the speckle pattern;selecting at least two of said first signals that are offset at different phases; anddetecting, amplifying and summing said at least two first signals that are offset at different phases, and generating a non-vanishing signal that represents an acoustic signal. 14. The method of claim 13, when used to suppress background airborne sound. 15. The method of claim 13, further comprising the step of fusing the non-vanishing signal that represents an acoustic signal with a signal obtained from an acoustic microphone, and further generating a signal representative of a high-fidelity sound with strong background noise suppression. 16. The optical pin-point microphone of claim 1, wherein the object of interest is a person speaking and the rough surface is the person's skin. 17. The method of claim 13, wherein the object of interest is a person speaking and the rough surface is the person's skin.
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이 특허에 인용된 특허 (4)
Kenjyo Hideyuki (Koganei JPX), Digital microphone.
Shah, Aalap Rajendra, Apparatuses and methods for sound recording, manipulation, distribution and pressure wave creation through energy transfer between photons and media particles.
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