Modeling and frequency tracking of marine mammal whistle calls
MetadataShow full item record
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.
CIVINS (Civilian Institutions) Thesis documentApproved for public release ; distribution is unlimited
Showing items related by title, author, creator and subject.
Naval Postgraduate School Physics (2015);How Do Speakers Work? Hello. I’m Dr. Bruce Denardo here in the Physics Department of the Naval Postgraduate School in Monterey, California. The purpose of a loudspeaker is to convert electrical energy into acoustic energy. ...
Assessing the performance of omni-directional receivers for passive acoustic detection of vocalizing odontocetes Daziens, John M. (Monterey, California. Naval Postgraduate School, 2004-06);This study sought to experimentally quantify the sonar performance of omni-directional receivers as a means to passively detect vocalizing Odontocetes. To accomplish this objective, controlled experiments using a calibrated ...
Unauthorized disclosure: can behavioral indicators help predict who will commit unauthorized disclosure of classified national security information? Sims, Karen Elizabeth (Monterey, California: Naval Postgraduate School, 2015-06);Federal government security-cleared personnel have been disclosing federal government classified national security information, whether to a foreign government or the United States media, at an increasing rate since the ...