Results 141 to 150 of about 1,345 (186)
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Biosonar of Bats and Toothed Whales: An Overview
2014The need for an updated review of echolocation is obvious in light of the rapid development in the field. Equipment has improved dramatically to allow unprecedented level of control also in field experiments. Also, the active acoustic orientation of bats and dolphins provide a unique window into adaptive perception processes, making echolocators ...
Surlykke, Annemarie, Nachtigall, Paul
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Functional Convergence in Bat and Toothed Whale Biosonars
Physiology, 2013Echolocating bats and toothed whales hunt and navigate by emission of sound pulses and analysis of returning echoes to form a self-generated auditory scene. Here, we demonstrate a striking functional convergence in the way these two groups of mammals independently evolved the capability to sense with sound in air and water.
Madsen, P T, Surlykke, Annemarie
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A comparison of biosonar beampatterns in bats.
The Journal of the Acoustical Society of America, 2010The beampattern associated with a diffracting baffle around a sound receiver can be predicted efficiently using numerical methods. Here, such methods have been used to derive estimates for a large number of reception beampatterns from high-resolution digital models of the shapes of pinnae (outer ears) of different bat species.
Rolf Müller, Zhen Yan
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Signal processing for target recognition in biosonar
Neural Networks, 1995Abstract Some properties of biological sonar systems are reviewed along with corresponding signal processing techniques. Relevant target representations appear to involve time-frequency or range-Doppler distributions and their projections as well as images derived from echoes observed at different positions.
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The quest for the biosonar image of the world
The Journal of the Acoustical Society of America, 2023The large differences in the wavelength of visible light and the ultrasonic pulses of bat biosonar raise the question whether the sensory world of bats is the same as that of humans and other visual animals, completely different, or something in-between.
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Reconstruction of acoustic scenes in biosonar
The Journal of the Acoustical Society of America, 2018Biosonar mechanisms are highlighted by comparing acoustically reconstructed scenes derived from generalized methods with the performance of echolocating animals. Bioinspired computations replacing standard methods then offer a path towards understanding the animal’s solutions. Seemingly simple outdoor spaces present flying bats with complex scenes when
Chen Ming +3 more
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Cepstral processing for bat biosonar
The Journal of the Acoustical Society of America, 2006Bats routinely discriminate multiple glint targets whose interglint time spacings are much less than the integration time of the bat auditory system. This suggests that the bats are exploiting spectral cues in the received echos to resolve the glints. Closely spaced glints cause notches and peaks in the received signal spectrum with frequency spacings ...
John R. Buck +2 more
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The Journal of the Acoustical Society of America, 2008
In a false killer whale Pseudorca crassidens, echo perception thresholds were measured using a go/no-go psychophysical paradigm and one-up-one-down staircase procedure. Electronically synthesized echoes were triggered by whale-emitted echolocation pulses, and the echo amplitudes were presented proportional to the triggering biosonar pulse amplitudes ...
Alexander Y. Supin +2 more
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In a false killer whale Pseudorca crassidens, echo perception thresholds were measured using a go/no-go psychophysical paradigm and one-up-one-down staircase procedure. Electronically synthesized echoes were triggered by whale-emitted echolocation pulses, and the echo amplitudes were presented proportional to the triggering biosonar pulse amplitudes ...
Alexander Y. Supin +2 more
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Biosonar-inspired technology: goals, challenges and insights
Bioinspiration & Biomimetics, 2007Bioinspired engineering based on biosonar systems in nature is reviewed and discussed in terms of the merits of different approaches and their results: biosonar systems are attractive technological paragons because of their capabilities, built-in task-specific knowledge, intelligent system integration and diversity.
Rolf, Müller, Roman, Kuc
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Natural History and Biosonar Signals
1995The diversity of bats is reflected in many aspects of their appearance and behavior. There are approximately 900 species of extant bats with most occurring in the tropics and subtropics. From continental settings to islands, including remote oceanic ones such as Hawaii, bats often are prominent members of the mammal fauna.
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