6.71 insertion loss. Ten times the logarithm to the base ten of the ratio of the power delivered to that part of the system that will follow the transducer, before insertion of the transducer, to the power delivered to the same part of the system after...
6.70 shading. Method of controlling the directional response pattern of a transducer through control of the distribution of phase and amplitude of the transducer action over the active...
6.69 beam width. At a specified frequency, in a specified plane including the beam axis, the angle included between the two directions, one to the left and the other to the right of the axis, at which the angular deviation loss has a specified value. Unit,...
6.68 angular deviation loss. Sensitivity level along the principal axis minus the sensitivity level of the transducer for a specified direction. Unit, decibel...
6.67 directional gain; directivity index. Of a transducer, ten times the logarithm to the base ten of the directivity factor. Unit, decibel (dB). Annotation Directional gain may...
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