2. Radiation from directional sources
2.1 Definitions of the directivity of a rotationally symmetrical source
2.1.1 Source directivity factor
The energy radiated by vibrating bodies is not emitted uniformly in all directions.
Apart from the case of the pulsating sphere, which is generally only a theoretical model, and the omnidirectional radiation of sources with small dimensions (in relation to wavelength), all acoustic emitters radiate according to an H(θ, ϕ) law that varies with frequency (figure
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Radiation from directional sources
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