Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Optical voice recorder by off-axis digital holography

Not Accessible

Your library or personal account may give you access

Abstract

An optical voice recorder capable of recording and reproducing propagating sound waves by using off-axis digital holography, as well as quantitative visualization, is presented. Propagating sound waves temporally modulate the phase distribution of an impinging light wave via refractive index changes. This temporally modulated phase distribution is recorded in the form of digital holograms by a high-speed image sensor. After inverse propagation using Fresnel diffraction of a series of the recorded holograms, the temporal phase profile of the reconstructed object wave at each three-dimensional position can be used to reproduce the original sound wave. Experimental results using a tuning fork vibrating at 440 Hz and a human voice are presented to show the feasibility of the proposed method.

© 2014 Optical Society of America

Full Article  |  PDF Article
More Like This
Optical voice encryption based on digital holography

Sudheesh K. Rajput and Osamu Matoba
Opt. Lett. 42(22) 4619-4622 (2017)

Security-enhanced optical voice encryption in various domains and comparative analysis

Sudheesh K. Rajput and Osamu Matoba
Appl. Opt. 58(11) 3013-3022 (2019)

Single-shot common-path off-axis digital holography: applications in bioimaging and optical metrology [Invited]

Manoj Kumar, Osamu Matoba, Xiangyu Quan, Sudheesh K. Rajput, Yasuhiro Awatsuji, and Yosuke Tamada
Appl. Opt. 60(4) A195-A204 (2021)

Supplementary Material (4)

Media 1: MP4 (23 KB)     
Media 2: MP4 (11 KB)     
Media 3: MP4 (11 KB)     
Media 4: MP4 (11 KB)     

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved