1
David C Kelley, David T Rackley, Victor P Berglund: Navigation and positioning system and method using uncoordinated beacon signals. Terrapin Corporation, Flehr Hohbach Test Albritton & Herbert, December 22, 1992: US05173710 (49 worldwide citation)

A positioning system uses a multiplicity of commercial broadcast stereo FM radio signal transmitters, at known fixed locations, each of which transmits a beacon signal having a phase that is un-synchronized with the phases of the beacon signals of the other transmitters. All the beacon signals have ...


2
David C Kelley, David T Rackley, Victor P Berglund: Navigation and positioning system and method using uncoordinated beacon signals. Terrapin Corporation, Flehr Hohbach Test Albritton & Herbert, January 18, 1994: US05280295 (48 worldwide citation)

A positioning system uses a multiplicity of commercial broadcast stereo FM radio signal transmitters, at known fixed locations, each of which transmits a beacon signal having a phase that is un-synchronized with the phases of the beacon signals of the other transmitters. All the beacon signals have ...


3
David T Rackley: Method and apparatus for controlling simultaneous switching output noise in boundary scan paths. VLSI Technology, Douglas L Weller, July 20, 1993: US05229657 (20 worldwide citation)

An integrated circuit limits simultaneous switching output noise. Within the integrated circuit, a plurality of output pads are connected to an output holding register. The output holding register includes a plurality of flip-flops. Each flip-flop has a clock input, a data input, and a data output. ...


4
David T Rackley: Meta stable resistant signal detector. VLSI Technology, Burns Doane Swecker & Mathis, November 15, 1994: US05365122 (8 worldwide citation)

The present invention relates to a signal detector capable of accurately and reliably interpreting different logic states of an asynchronous signal of unpredictable pulse width or amplitude. In one embodiment of the invention, a meta-stable resistant set-reset (RS) flip-flop is described which can b ...