Alternating variable delay control arrangement and method for push-pull audio transducers

DETAILED DESCRIPTION What is claimed as new and desired to be secured by Letters Patent of the United States is: 1.
A control arrangement for a push-pull audio transducer system of the type including two transducers coaxially disposed relative to each other and each including a cone and an electrically actuated drive arrangement for the cone, the bases of the cones being in facing relationship and arranged to define a chamber therebetween, the control arrangement comprising: delay means connected to an audio signal input source for providing at an output a delayed audio signal that is delayed by a predetermined time interval with respect to the audio signal input source; means responsive to the audio signal input source for generating a switching control input based on the polarity of the rate of change of the audio signal input source; and means responsive to said audio signal input source and said delayed audio signal output for selectively connecting each of the drive arrangements for the two transducers to a different one of said delayed audio signal or said audio signal input source in response to said switching control input, said drive arrangements being connected in opposite phase relationship.
2.
The control arrangement of claim 1 wherein said predetermined time interval is determined by the approximate time for sound to move between the transducers.
3.
The control arrangement of claim 1 wherein said delay means comprises variable delay adjustment means for selectively varying said predetermined time interval.
4.
The control arrangement of claim 3 wherein said variable delay adjustment means comprises manual adjustment means.
5.
The control arrangement of claim 1 wherein said switching control input generating means comprises means responsive to said audio signal input source for determining the rate of voltage change of said audio signal input source versus time.
6.
The control arrangement of claim 5 wherein said switching control input generating means provides a first output state switching control input when said rate of change is positive and provides a second output state switching control input when said rate of change is negative