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| 41. |
Fast Beam‐Forming Algorithm |
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The Journal of the Acoustical Society of America,
Volume 44,
Issue 5,
1968,
Page 1454-1455
Jack R. Williams,
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PDF (297KB)
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摘要:
Digital beam forming in the frequency domain is suggested based on phase shifting by complex multipliers of Fourier series sinusoids. An analogy is then shown between the formation of sequential beams in a line array and the fast Fourier transform, which allows a substantial reduction in the number of multiplications required to form the sweeping beam.
ISSN:0001-4966
DOI:10.1121/1.1911285
出版商:Acoustical Society of America
年代:1968
数据来源: AIP
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| 42. |
Correlation of Naturally Occurring Infrasonics and Selected Human Behavior |
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The Journal of the Acoustical Society of America,
Volume 44,
Issue 5,
1968,
Page 1456-1457
J. E. Green,
F. Dunn,
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PDF (280KB)
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摘要:
An initial attempt is made to determine whether infrasonic waves generated by storms of distant origin affect local human behavior. Severe storm activity in North America was compared with the automobile accident rate and the rate for absenteeism among school children in the area of Chicago Illinois during the first 28 days of May 1967. The results suggest that a correlation may exist between the presence of infrasonic disturbances in the Chicago area and changes in selected human behavior. It is urged that more comprehensive studies of this nature be carried out.
ISSN:0001-4966
DOI:10.1121/1.1911286
出版商:Acoustical Society of America
年代:1968
数据来源: AIP
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