System and method for detection of speech related acoustic signals by using a laser microphone

摘要

A system for detection of speech related acoustic signals by using laser based detection that includes a mask configured for being worn over a face part of a speaker covering the speaker's mouth, where the mask includes at least one reflective coating covering at least one area of the mask that reflects collimated electromagnetic signals; and a laser microphone configured for detecting vibrations of the reflective coating area for detection of acoustic signals associated with speech of the speaker by using collimated electromagnetic signals. The mask the reflective coating area thereof allow enhancing detection of vibrations resulting from speech carried out by the speaker wearing said mask.

主权项

1. A system comprising:
a coherent electromagnetic wave beam receiver to receive a coherent electromagnetic wave beam reflected from a mouth-covering mask which covers a mouth of a human speaker, wherein the mouth-covering mask (i) blocks air exhaled by said human speaker during speech, and (ii) enhances speech-related vibrations during speech, and thereby (iii) enhances quality of remote detection of vibrations resulting from speech carried out by said human speaker wearing said mouth-covering mask; wherein the coherent electromagnetic wave beam receiver comprises a self-mixing diode that both (a) generates an outgoing coherent electromagnetic wave beam and (b) receives the coherent electromagnetic wave beam reflected from said mouth-covering mask, wherein said mouth-covering mask has a reflective coating on at least a portion of an outer surface of said mouth-covering mask, wherein the reflective coating of said mouth-covering mask is reflective in a signal range corresponding to the signal range of said outgoing coherent electromagnetic wave beam; a processing unit to reconstruct a sound signal that corresponds to a sound generated by said human speaker wearing said mouth-covering mask, based on analysis of instabilities in said self-mixing diode caused by the coherent electromagnetic wave beam reflected from said mouth-covering mask, wherein said coherent electromagnetic wave beam receiver is separately located from said mouth-covering mask.