Patent ID: 9344811
Filing Date: 2016-05-17
CPC Classification: A41D,H04R

Claim Text:
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.