SOUNDINGS

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en.Antares M. Parvulescu 19231998

Antares Parvulescu, a Fellow othe Acoustical Society of America anda leading figure in underwater acoutics and the inventor of the MatcheField Processing technique, nowwidely used in underwater acousticdied on July 15, 1998 from complications of a stroke.

Antares was born in Romaniaand his father, an astronomer, namehim after a super-giant star: first magnitude Antares in Scorpio; 300 timethe diameter of our sun; and 300times as luminous. Antares, who became a super star in his own right, waexceptionally gifted and received hi

doctoral degree in mathematics in 1943 from the University of Bucharethe early age of 19. He learned to fly at 14, and at age 20 flew his own pescaping from Romania to Turkey on an anti-Nazi mission. He spentremainder of the war at the Romanian mission in Egypt. After the Comnist take-over of Romania, he moved to South Africa, where he taught aUniversity of Witwatersrand~19471950!, and then in 1950 moved to thUnited States, where he continued to progress in an academic careBerkeley ~19501951!, Bard ~19511954!, Villanova ~19541955!, andGallaudet~19551960!, serving the latter as Head of the Physics Depament. In 1960, he joined Columbia Universitys Hudson Laboratoriesconcentrated on research in oceanography and underwater acoustics.of the ideas for which he is now well known trace back to this periodHudson Laboratories. Perhaps his greatest one is what we now call MaField Processing, which can alternately be termed Phase ConjugatioTime Reversal. He called this invention MESS, because sound propagis indeed a mess, and he had various explanatory names for the acrony~forexample, Matched Environment Sonar Signal!. Although the technique ofmatched filtering had been published earlier for radar, he grasped thecept perfectly, and used the ocean as its own matched filter. His sempublication was a terse abstract inThe Journal of the Acoustical Society oAmerica in 1961. He was granted a patent for the technique in 1962,many years later, in 1996, published~with the help of his good friend RayFitzgerald! the historical perspective inThe Journal of the Acoustical Society of America. Other research in the 1960s anticipated Synthetic AperSonar.

When Hudson Laboratories closed in 1968 he moved to the Univeof Hawaii, with an appointment as Professor of Ocean Engineeand continued to work there, doing teaching and research, supervgraduate student work, until the nominal retirement age. During this perhe served in 1983 on an Intergovernmental Personnel Agreement~IPA!at the Naval Research Laboratory~NRL! in Washington, DC. After retire-ment from the University of Hawaii he joined NRL as a permanent eployee and resumed a full-time research involvement. At NRL, Antaapplied a broad knowledge of all aspects of ocean acoustics on a varieprojects, and was a major advisor to several Navy organizations. Afteretirement from NRL, less than a year before his passing away, heconsiderable success as an independent consultant, with a numbprojects that had attracted the interest of Navy research program officerwhich he intended to pursue in the years to come. He was especially iested in active noise cancellation, and a project in near field noise canction was scheduled to be funded by the Office of Naval Research at theof his death.

Dr. Parvulescu is survived by his wife Elaine and by his sConstantin.

THEO KOOIJJ. Acoust. Soc. Am. 110 (4), October 2001 0001-4966/2001/110(4)/1

ution subject to ASA license or copyright; see http://acousticalsociety.org/cate,e-

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William Mott Hall 19062000William Mott Hall, a Fellow of the Acoustical Society of America

died of natural causes in Lexington, Massachusetts, on 3 August 2000Hall was born on 10 July 1906 in Burlington, Vermont, and beganundergraduate studies at the University of Vermont in 1923. He transfeto the Massachusetts Institute of Technology~MIT ! in 1925 and received hisBSEE in 1928, his MS in 1932, and his Sc.D. in 1935; all of his degrwere in Electrical Engineering. He joined the Acoustical Society of Amerin 1930 and his name appears in the membership listing published inApril 1931 issue of JASA. Both of his dissertations were written underdirection of Professor Richard D. Fay, a charter member of the AcousSociety and a long-term distinguished contributor to this journal. Halls Mthesis was titled An investigation of sound fields within regions restrictby finite boundaries, and this formed the basis for his first paper inJournal, Comments on the theory of horns@J. Acoust. Soc. Am.3, No. 4,552561~1932!#.

During the latter phase of his graduate work, Hall worked with Fayproblems of electroacoustic measurements and public address systepaper published in the July 1933 issue of JASA@J. Acoust. Soc. Am.5,4656~1933!# with Fay was titled Determination of the acoustical outpuof a telephone receiver from input measurements. At the 14th meetinthe ASA, held at Harvard in December 1935, Fay and Hall both gave treporting the discovery of what was later to become known as the Heffect or the precedence effect, whereby~as expressed in a letter to the editopublished in January 1956! in a sound-enforcing system, a suitable timdelay in the amplified sound produces a desirable illusion in that theforced sound, as well as the direct, appears to originate at the mouth olistener.

Following the completion of his doctorate, Hall remained at MIT aheld appointments as Instructor and Assistant Professor of Electrical Cmunications. It was during this period that he wrote what was destinebecome one of the best-cited papers in the history of acoustics, this btitled An acoustic transmission line for impedance measureme@J. Acoust. Soc. Am.11, No. 1, Pt. 1, 140146~1939!#. This paper containsthe theory of the impedance tube which is typically discussed in evtextbook on acousticsThe measurement consists of a simple determtion of the location and relative magnitude of the maximum and minimsound pressures along the tube. Hall was made a Fellow of the AcousSociety of America in 1940.

Halls research in acoustics was largely curtailed with a call to helpthe US research and development work related to World War II. Dur1940 and 1941 he was head of the Indicator Group of the MIT RadiaLaboratory. In 1941, when his expertise in microwaves was neededRaytheons activities in the war effort, he joined the Raytheon Companywhich he worked for the remainder of his professional career. Whilgraduate student at MIT, Hall had done some work with Vannevar Buwho was then Dean of the School of Engineering. In 1940, Dr. Bush, tChairman of the National Defense Research Committee~NDRC!, appointedHall a consultant to the Microwave Section of the NDRC. During WoWar II, Hall was responsible for the design, development, and installatiothe first radar aboard ships in the United States Navy. He received a cecate of commendation from the United States Government for this efDuring the Cold War, he served on the Gaither Committee, a grouppointed by President Eisenhower in 1957 to survey national security plems. In 1962, he became the first person to be awarded Raytheons dguished title of Consulting Scientist, and in 1966 he was made a Fellowthe Institute of Electrical and Electronics Engineers.

He held 37 patents covering infrared, acoustics, instrument landsystems, radar devices, and the microwave oven. At the time of his rement in 1971 he was the Raytheon Companys Director of DevelopmeEngineering. He continued to consult for the company until he was 84 yold.

He leaves three sons, 12 grandchildren, and 12 great-grandchildr

JOSEPH L. HALL1707707/2/$18.00 2001 Acoustical Society of America

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SOUNDINGS

RedistribDan Jerry Ramsdale 19422000

Dan Jerry Ramsdale, a membeof the Acoustical Society of Americaand an authority on Arctic Oceanacoustics and atmospheric acousticdied in New Orleans on September 12000 after a three-year battle with cancer. Ramsdale was born in El PasTexas, on December 12, 1942 and dhis undergraduate work at the Univesity of Texas at El Paso, where he received a BS in Physics with higheshonors. He subsequently carried ograduate work in nuclear physics aKansas State University, receiving hdoctorate in 1969.

Dr. Ramsdale returned to El Pasin 1969 and began research in atmospheric acoustics at Globe UnivScience and Manufacturing, eventually becoming the Director of AcouResearch for that organization. A principal problem addressed duringGlobe years was the use of acoustics to extract data on temperaturwind structure in the upper atmosphere. In 1974 Dr. Ramsdale left Gand became a research physicist at the Naval Research Laboratory in Wington DC and began a career in underwater acoustics, with the studlow-frequency fluctuations within the deep ocean. A principal achievemwas a model that predicted the statistical fluctuations that were observlong-range propagation due to source motion and medium variability.

In 1977, Dr. Ramsdale transferred to the newly established N1708 J. Acoust. Soc. Am., Vol. 110, No. 4, October 2001

ution subject to ASA license or copyright; see http://acousticalsociety.org/csalice

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Ocean Research and Development Activity@NORDA, which later becamethe Naval Oceanographic and Atmospheric Research Laboratory~NOARL!,and which is presently the Naval Research Laboratory#Stennis SpaceCenter ~NRLSSC! in Mississippi, where he carried out research in tacoustics of arrays and in signal processing, with a major activity involvthe use of vertical arrays for the understanding of different propagapaths. In the 1980s, he became extensively involved in the acoustic plems of the Arctic Ocean, and in 1985, he undertook technical managemof the Arctic Undersea Warfare Environmental Technology Program, wsubsequent appointments~1988! as Assistant Director of the Ocean Acoutics and Technology Directorate and Head of the Ocean Acoustics Bra~1992!. The work in the acoustics of the Arctic led to two Distinguished UCitations from the Chief of Naval Research.

Following his retirement from NRLSSC in 1998, Dan becameindependent consultant to NRLSSC and to the Los Alamos National Laratory, with services in support of the Comprehensive Nuclear TestTreaty, embracing infrasonic monitoring, ambient noise, and high-frequeatmospheric acoustics. At the time of his death he was working withNational Center for Physical Acoustics at the University of Mississippiatmospheric acoustic problems associated with cruise missile defense.

Throughout his career, Dr. Ramsdale was active in both the ASTechnical Committee on Underwater Acoustics and in the IEEE OceaEngineering Society, serving the latter as Chairman of the CommitteeUnderwater Acoustic Technology. He is survived by his wife Portia, his s

Stuart, and his daughter, Jerry Elizabeth Novak.

ROBERT W. FARWELLObituaries

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