Modeling and frequency tracking of marine mammal whistle calls
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Authors
Severson, Jared
Subjects
Advisors
Date of Issue
2009-02
Date
Publisher
Monterey California. Naval Postgraduate School
Language
en_US
Abstract
Marine mammal whistle calls present an attractive medium for covert underwater communications. High quality models of the whistle calls are needed in order to synthesize natural-sounding whistles with embedded information. Since the whistle calls are composed of frequency modulated harmonic tones, they are best modeled as a weighted superposition of harmonically related sinusoids. Previous research with bottlenose dolphin whistle calls has produced synthetic whistles that sound too clean for use in a covert communications system. Due to the sensitivity of the human auditory system, watermarking schemes that slightly modify the fundamental frequency contour have good potential for producing natural-sounding whistles embedded with retrievable watermarks. Structured total least squares is used with linear prediction analysis to track the time-varying fundamental frequency and harmonic amplitude contours throughout a whistle call. Simulation and experimental results demonstrate the capability to accurately model bottlenose dolphin whistle calls and retrieve embedded information from watermarked synthetic whistle calls.
Type
Thesis
Description
CIVINS (Civilian Institutions) Thesis document
Series/Report No
Department
Organization
Massachusetts Institute of Technology
Woods Hole Oceanographic Institution
Identifiers
NPS Report Number
Sponsors
Funding
Contract number: N62271-97-G-0026.
CIVINS
CIVINS
Format
107 p. : ill.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.