Patent ID: 9683912
Date: 2017-06-20
CPC Classifications: G01M,G01N

Claim:
1. A direct field acoustic testing system comprising: a control microphone; a controller operatively coupled to the control microphone such that the controller receives at least one input signal from the control microphone and provides at least four separately controllable controller output signals; a combiner configured to combine said at least four separately controllable controller output signals to form at least four secondary output signals, at least one of the at least four secondary output signals composed of a combination of at least two of said at least four separately controllable controller output signals; and at least four acoustic transducers or groups of transducers each of which is operatively coupled to at least one of said at least four secondary output signals such that the output of at least one of the at least four acoustic transducers or transducer groups varies in response to changes in at least two of the at least four separately controllable controller output signals.