Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
Patent
1987-11-19
1990-05-08
Ng, Jin F.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having electrostatic element
381193, 381194, 381196, 381202, H04R 900, H04R 702, H04R 718, H04R 904
Patent
active
049245040
ABSTRACT:
An audio full range speaker which achieves the propogation of a peaked wavefront from the diaphragm instead of generating a substantially planar wavefront as in the case of the common speaker construction utilizing a diaphragm driven as a piston. The speaker has a substantially planar, thin, flexible film forming the diaphragm mounted within a frame. The diaphragm is driven by a driver which imparts motion to the diaphragm at a small source area, the motion being imparted in a direction normal to the plane of the diaphragm so that ripples radiate from the drive area and travel at the same time across the flexible diaphragm, one behind the other, towards the frame. The rest of the diaphragm is driven by the central moving portion, endowing it with a built-in time delay. Because of the time delay involved in spreading the energy across the diaphragm, the wavefront radiated by the speaker ges a head start at the center and lags towards the edges. The result is that of a spreading spherical wave front for a point source and a cylindrical wave front from a line source, and allowing a large diaphragm to behave as a small virtual audio source. The full range transducer requires no crossover, equalization or time delay circuits.
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"New Developments in Electrostatic Loudspeakers" by P. J. Walker; Journal of the Audio Engineering Society, vol. 28, No. 11, pp. 795-799.
Journal of the Audio Engineering Society, vol. 28, No. 11, Nov. 1980, pp. 796-798, Walker, P. J. "New Developments in Electrostatic Loudspeakers".
Byrd Danita R.
Highwood Audio Inc.
Ng Jin F.
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