Most optical information processors deal with text or image data,and it is very difficult to deal experimentally with acoustic data.Therefore,optical advances that deal with acoustic data are highly desirable in this ...Most optical information processors deal with text or image data,and it is very difficult to deal experimentally with acoustic data.Therefore,optical advances that deal with acoustic data are highly desirable in this area.In particular,the development of a voice or acoustic-signal authentication technique using optical correlation can open a new line of research in the field of optical security and could also provide a tool for other applications where comparison of acoustic signals is required.Here,we report holographic acoustic-signal authentication by integrating the holographic microphone recording with optical correlation to meet some of the above requirements.The reported method avails the flexibility of 3D visualization of acoustic signals at sensitive locations and parallelism offered by an optical correlator/processor.We demonstrate text-dependent optical voice correlation that can determine the authenticity of acoustic signal by discarding or accepting it in accordance with the reference signal.The developed method has applications in security screening and industrial quality control.展开更多
In the last few decades,there have been several advances in ultrafast imaging of light propagation with light-in-flight recording by holography(LIF holography),which can capture light propagation as a motion picture w...In the last few decades,there have been several advances in ultrafast imaging of light propagation with light-in-flight recording by holography(LIF holography),which can capture light propagation as a motion picture with a single shot in principle.Here,we review the recent advances in LIF holography by considering the perspectives of various development of functional imaging techniques and evaluation of LIF holography with numerical simulation methods.The methods for recording multiple motion pictures such as a space-division multiplexing,a pixel-by-pixel-based space-division multiplexing,and an angular multiplexing technique are added extend the capability of LIF holography.The numerical simulation models used for investigating the image characteristics of LIF hologram are discussed.Finally,a summary and conclusion of recent advances in LIF holography is presented.展开更多
基金Japan Society for the Promotion of Science(20H05886,20H05887,22K18809,23K1912)Science and Engineering Research Board(CRG/2021/001763)Prime Minister Research Fellowship(2701807)。
文摘Most optical information processors deal with text or image data,and it is very difficult to deal experimentally with acoustic data.Therefore,optical advances that deal with acoustic data are highly desirable in this area.In particular,the development of a voice or acoustic-signal authentication technique using optical correlation can open a new line of research in the field of optical security and could also provide a tool for other applications where comparison of acoustic signals is required.Here,we report holographic acoustic-signal authentication by integrating the holographic microphone recording with optical correlation to meet some of the above requirements.The reported method avails the flexibility of 3D visualization of acoustic signals at sensitive locations and parallelism offered by an optical correlator/processor.We demonstrate text-dependent optical voice correlation that can determine the authenticity of acoustic signal by discarding or accepting it in accordance with the reference signal.The developed method has applications in security screening and industrial quality control.
基金Japan Society for the Promotion of Science(JSPS),KAKENHI Grantin-Aid for Scientific Research(A)(17H01062)KAKENHIGrantin-Aid for Transformative Research Areas(A)(20H05887 and 20H05886)KAKENHI Grant-in-Aid for JSPS Research Fellows(20J23542).
文摘In the last few decades,there have been several advances in ultrafast imaging of light propagation with light-in-flight recording by holography(LIF holography),which can capture light propagation as a motion picture with a single shot in principle.Here,we review the recent advances in LIF holography by considering the perspectives of various development of functional imaging techniques and evaluation of LIF holography with numerical simulation methods.The methods for recording multiple motion pictures such as a space-division multiplexing,a pixel-by-pixel-based space-division multiplexing,and an angular multiplexing technique are added extend the capability of LIF holography.The numerical simulation models used for investigating the image characteristics of LIF hologram are discussed.Finally,a summary and conclusion of recent advances in LIF holography is presented.
