Far-field polar response at a given frequency is governed by the wavenumber k

Evidence

Where n is proportional to the point source number, as shown in Figure A6.1. For the example shown in Figure A6.1, this results in an equation for the far-field polar response at a frequency whose wavenumber is k, which is: N ( ) - ( ) - ( ) - ( ) θ θ θ θ = + + + + − 0 0 1 1 2 2 1 sin sin sin  - ( -1) j N kd sin θ (A6. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2872