Patent ID: 9277330
Filing Date: 2016-03-01
CPC Classification: H04R

Claim Text:
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; and a 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.