ExtensionEncode a monophonic input to a Higher Order Ambisonic signal (HOA), with near-field effect (NFE).
| in | 
 The input signal.  | 
| theta | 
 Azimuth, in radians.  | 
| phi | 
 Elevation, in radians.  | 
| radius | 
 Radius, in meters.  | 
| order | 
 Ambisonic order.  | 
HoaEncodeDirection offers HOA encoding equivalent to FoaPanB followed by FoaProximity, in the first order case.