The novel role of arctangent phase algorithm and voice enhancement techniques in laser hearing

At present, laser hearing has played more and more important role in the field of anti-terrorism and security defense all around the world. In order to acquire remote voice, a Laser Doppler Vibrometer (LDV) is established, the voice signal demodulation method is based on the arctangent phase algorithm. On the basis of the system, a kind of speech enhancement technology is used to improve the intelligibility of the noisy voice signals detected by the LDV system. First, based on the heterodyne detection theory, the detection principle and method which acquire voice by detecting throat vibration is introduced. Then a kind of speech enhancement technology is used to improve the intelligibility of the noisy voice signals detected by the LDV system. Finally, to validate this system and speech enhancement technology, some experiments are performed and the results indicated that the comprehensible speech signals within the range of 75 m can be obtained by self-made LDV. On the other hand, the speech enhancement technology can improve the intelligibility of the noisy voice signals detected by the LDV system effectively.