. Elements of acoustical engineering. Electro-acoustics; Sound. ^J^Mct~r) sin a Retaining the real parts of equation "=-^[7= cos k{ct — r) sin k{ct — r) sin a At a very large distance Ak . u <x — sm a At a very small distance A . « a: — sm a Figure shows the velocity com- ponents and the pressure for various points around a doublet source. A com- mon example of a doublet source is a direct radiator loud speaker mounted in a small baffle. (Dimensions of the baffle small compared to the wavelength.) If the response of such a loud speaker is measured with a pr
. Elements of acoustical engineering. Electro-acoustics; Sound. ^J^Mct~r) sin a Retaining the real parts of equation "=-^[7= cos k{ct — r) sin k{ct — r) sin a At a very large distance Ak . u <x — sm a At a very small distance A . « a: — sm a Figure shows the velocity com- ponents and the pressure for various points around a doublet source. A com- mon example of a doublet source is a direct radiator loud speaker mounted in a small baffle. (Dimensions of the baffle small compared to the wavelength.) If the response of such a loud speaker is measured with a pressure microphone for various angles at a constant distance the result will be a cosine characteristic. If the response is measured with a vel- ocity microphone keeping the axis pointed towards the loud speaker the result will be a cosine directional characteristic. If the same is repeated keeping the axis of the velocity microphone normal to the line joining the microphone and the loud directional Fig. The pressure and particle velocity at a constant distance from a doublet source. The magnitude of the pressure is indicated by the diameter of the circle. The particle velocity has two components: a radial and transverse component. The direction and magnitude of these two components are indicated by vectors. speaker the result will be a sine. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Olson, Harry Ferdinand, 1901-. New York, D. Van Nostrand company, inc.
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