The Doppler effect simulates a noise source passing by and the resulting special auditory features.   
The following setting options are available:
Graph
 
Shows the target and end point of the movement of the noise source. The listener is at the center of the graph.
The pattern of the movement can be changed using the straight lines in the graph.
Slider
Diameter
Specifies the diameters of the movement radius.
Slider
Duration
Specifies the duration of the movement.
 


Doppler