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WorldCat.org

The extraordinary ability of dolphins to echolocate has fascinated scientists and the public since its discovery in the late 1950's. This book summarizes modern research in this area, and presents a broad synthesis of this very interdisciplinary subject. The author brings together research on the physiological, mathematical and engineering aspects of the subject. Of interest to auditory researchers, electrical engineers, acoustical physicists, and mammalian physiologists

1 Introduction.- 1.1 Historical Perspective.- 1.2 Some Underwater Acoustics.- 1.3 The Time and Frequency Domains.- 1.4 Experimental Psychological Methodology.- 1.5 Signal Detection Theory.- 2 The Receiving System.- 2.1 The Outer Ears.- 2.2 The Middle Ear.- 2.3 The Inner Ear.- 2.4 Summary.- 3 Characteristics of the Receiving System for Simple Signals.- 3.1 Hearing Sensitivity.- 3.2 Spectral Analysis Sensitivity.- 3.3 Directional Hearing.- 3.4 Response Bias and Sensitivity in Hearing.- 3.5 Summary.- Appendix: Derivation of the Receiving Directivity Index.- 4 Characteristics of the Receiving System for Complex Signals.- 4.1 Perception of Click Signals.- 4.2 Perception of Time Separation Pitch.- 4.3 Summary.- 5 The Sonar Signal Transmission System.- 5.1 Preliminary Examination of Biosonar Signals.- 5.2 Sound Production Mechanism.- 5.3 Acoustic Propagation in the Dolphin’s Head.- 5.4 Summary.- 6 Characteristics of the Transmission System.- 6.1 The Concept of Near and Far Acoustic Fields.- 6.2 The Dolphin Near- to Far-Field Transition Region.- 6.3 The Acoustic Field on a Dolphin’s Head.- 6.4 Directional Pattern of Biosonar Signals.- 6.5 Equivalent Planar Circular Aperture.- 6.6 Summary.- 7 Characteristics of Dolphin Sonar Signals.- 7.1 Click Intervals.- 7.2 Frequency Characteristics.- 7.3 Click Source Levels.- 7.4 Number of Clicks and Response Latencies.- 7.5 Signals from Other Species.- 7.6 Summary.- 8 Target Detection Capability of the Active Sonar System.- 8.1 The Physics of Acoustic Reflection by Targets.- 8.2 Noise-Limited Form of the Sonar Equation.- 8.3 Biosonar Detection Capabilities.- 8.4 Detection of Complex Echoes.- 8.5 Comparison Between a Dolphin and an Ideal Receiver.- 8.6 Target Detection in Reverberation.- 8.7 Summary.- 9 Biosonar Discrimination, Recognition, and Classification.- 9.1 Mathematical Tools for the Analysis of Target Echoes.- 9.2 Target Size Discrimination.- 9.3 Target Structure Discrimination.- 9.4 Target Shape Discrimination.- 9.5 Delayed Matching to Sample.- 9.6 Target Range Difference Discrimination.- 9.7 Insights from Human Listening Experiments.- 9.8 Summary.- 10 Signal Processing and Signal Processing Models.- 10.1 Analysis of Dolphin Sonar Signals.- 10.2 The Dolphin Modeled as an Energy Detector.- 10.3 Signal Processing Models for Target Recognition.- 10.4 Artificial Neural Networks and Target Recognition.- 10.5 Summary.- 11 Comparison Between the Sonar of Bats and Dolphins.- 11.1 Comparison of Sonar Signals.- 11.2 Comparison of Signal Detection Capabilities.- 11.3 Comparison of Target Discrimination Capabilities.- 11.4 Doppler Compensation and Flutter Detection.- 11.5 Summary.- 12 Road Map for Future Research.- 12.1 Mechanisms of Sound Reception and Hearing.- 12.2 Mechanisms of Sound Production and Transmission.- 12.3 Biosonar Capabilities and Mechanisms.- 12.4 Signal Processing Models.- 12.5 Natural and Dynamic Biosonar Behavior.- 12.6 Concluding Remarks.

Focusing on dolphin sonar, this book combines the anatomical, physiological, mathematical and engineering aspects of dolphin sonar.

The sonar of dolphins