Automatic Control of Multimedia Shows
Audiovisual program synchronized digitally. Controller synchronizes over 60 events to two 16-millimeter movies regardless of speed variations in movie projectors.
Holley, L. D.↗
Engineering topics
Holley, L. D.
Publications and source records attributed to Holley, L. D..
Digital automatic gain amplifier
A circuit is described for adjusting the amplitude of a reference signal to a predetermined level so as to permit subsequent data signals to be interpreted correctly. The circuit includes an operational amplifier having a feedback circuit connected between an output terminal and an input terminal; a bank of relays operably connected to a plurality of resistors; and a comparator comparing an output voltage of the amplifier with a reference voltage and generating a compared signal responsive thereto. Means is provided for selectively energizing the relays according to the compared signal from the comparator until the output signal from the amplifier equals to the reference signal. A second comparator is provided for comparing the output of the amplifier with a second voltage source so as to illuminate a lamp when the output signal from the amplifier exceeds the second voltage.
Holley, L. D.↗
Microcomputerized electric field meter diagnostic and calibration system
A computerized field meter calibration system which includes an apparatus for testing the calibration of field meters normally utilized for measuring electromagnetic field potentials is described. A reference voltage is applied to the field meter for causing signals to be produced on the output terminals thereof. A bank of relays is provided for selectively connecting output terminals of the field meter to a multiplexer by means of a digital voltmeter and an oscilloscope. A frequency-shift-keyed receiver is also connected to one of the terminals of the field meter for transmitting and converting a frequency shift keyed signal to a digital signal which is, subsequently, applied to the multiplexer.
Holley, L. D.↗
Bidirectional Amplifier
Two-stage transformer-coupled device amplifies incoming and outgoing signals of different frequencies being propagated in both directions along single line.
Holley, L. D.↗
Monitor for checking electric-field meters
Portable monitor can be used to check electric-field meters on location. Faulty communication line or faulty unit can be determined on the spot.
Holley, L. D.↗
An automatic lightning detection and photographic system
Conventional 35-mm camera is activated by an electronic signal every time lightning strikes in general vicinity. Electronic circuit detects lightning by means of antenna which picks up atmospheric radio disturbances. Camera is equipped with fish-eye lense, automatic shutter advance, and small 24-hour clock to indicate time when exposures are made.
Wojtasinski, R. J.↗
Automatic lightning detection and photographic system
A system is presented for monitoring and recording lightning strokes within a predetermined area with a camera having an electrically operated shutter with means for advancing the film in the camera after activating the shutter. The system includes an antenna for sensing lightning strikes which, in turn, generates a signal that is fed to an electronic circuit which generates signals for operating the shutter of the camera. Circuitry is provided for preventing activation of the shutter as the film in the camera is being advanced.
Wojtasinski, R. J.↗