Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Broadband time-reversing array retrofocusing in noisy environments.

Karim G Sabra1, Sunny R Khosla, David R Dowling

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor 48109-2121, USA.

The Journal of the Acoustical Society of America
|February 28, 2002
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Impact localization on a finite metal plate using matched field processing and a microphone arraya).

The Journal of the Acoustical Society of America·2025
Same author

Influence of lee waves on ocean acoustic simulations near Atlantis II Seamount.

The Journal of the Acoustical Society of America·2025
Same author

Spatial observations of low-frequency acoustic propagation near isolated seamounts using an autonomous surface vehicle.

JASA express letters·2025
Same author

Leveraging sound speed dynamics and generative deep learning for ray-based ocean acoustic tomography.

JASA express letters·2025
Same author

Impact of vertical resolution in a regional ocean circulation model of the northern Gulf of Mexico for acoustic predictions in the upper ocean.

The Journal of the Acoustical Society of America·2025
Same author

Impact localization on a metal plate using matched field processing and a microphone arraya).

The Journal of the Acoustical Society of America·2025
Same journal

High-resolution depth estimation for multiple wideband sources in deep sea via sparse Bayesian learninga).

The Journal of the Acoustical Society of America·2026
Same journal

Depression markers in speech: An approach based on tract variables dynamics.

The Journal of the Acoustical Society of America·2026
Same journal

The oyster toadfish (Opsanus tau) alters active and diurnal calling amid vessel noise in New York City.

The Journal of the Acoustical Society of America·2026
Same journal

Experimental noise characterisation of phase-locked tandem-rotor in edgewise flight.

The Journal of the Acoustical Society of America·2026
Same journal

The tune-text-temporal synergy: Prosodic effects of final segmental weakening in Neapolitan.

The Journal of the Acoustical Society of America·2026
Same journal

Monitoring vessel movement above critical offshore infrastructure using distributed acoustic sensing.

The Journal of the Acoustical Society of America·2026
See all related articles

Acoustic time reversal arrays (TRA) focus sound in noisy environments. Their signal-to-noise ratio (SNRf) improves with bandwidth and signal duration, outperforming free-space in shallow water by exploiting multipath propagation.

Area of Science:

  • Acoustics
  • Signal Processing
  • Underwater Acoustics

Background:

  • Acoustic time reversal (TRA) offers spatial and temporal sound focusing in unknown environments.
  • TRAs listen to a source and transmit a time-reversed signal.
  • Noise degrades TRA performance by masking signals and introducing interference.

Purpose of the Study:

  • To present formal results for the signal-to-noise ratio at the focus (SNRf) for TRAs in noisy environments.
  • To develop a simplified formula for SNRf under specific noise conditions.
  • To illustrate SNRf using simulations in a shallow water environment.

Main Methods:

  • Derivation of formal results for SNRf for broadband signals.
  • Simplification of SNRf formula for homogeneous, uncorrelated noise with power limitations.

Related Experiment Videos

  • Parabolic-equation propagation simulations in shallow water.

    • Main Results:

    • SNRf is proportional to signal bandwidth and pulse duration.
    • A simplified algebraic formula for SNRf is derived.
    • Simulations show SNRf behavior for ranges up to 40 km and bandwidths up to 500 Hz.

    Conclusions:

    • TRA performance is dependent on signal characteristics, source, array, and environment.
    • Shallow-water TRAs demonstrate superior noise rejection compared to free space.
    • TRAs effectively utilize multipath propagation for enhanced performance.