Autech Corporation

Other

Foster Airdata Systems Inc.

David E Harris

George B Foster

Robert M Watson

John D Redmyer

An arrangement for preventing inadvertent transmission by a push-to-talk transceiver that might join a communications channel. After the push-to-talk switch has been activated, an average background noise level is established. Audio from speech, for example, having peaks greater than a predetermined percentage of the average background noise level are required to maintain the push-to-talk function activated.

Transmit/receive mode protection arrangement

In a communication system wherein multiple radio stations communicate with one another over a single channel, an arrangement for indicating to a first user who is transmitting over the channel that there is a simultaneous transmission occurring on the channel by another user, possibly blocking or interferring with transmission by the first user. The arrangement includes means for periodically causing the transmitting first radio station to reduce its transmitting power, listen for a simultaneous transmission on the channel by another station, and then resume full transmitting power. The detection of a simultaneous transmission is annunciated to alert the first user that his transmissions may have been interferred with. Interruption of the first user's transmission may occur either periodically or at detected pauses between the first user's spoken words. The arrangement operates in conjunction with the conventional automatic gain control circuit of the first user's station.

Simultaneous transmission signal detection system

An optical gauging device wherein a laser beam is deflected to produce a bidirectional scan; a measuring portion of the split beam scans an object being inspected while the other portion scans a calibration reticle having alternating opaque and transparent bands. The alternating transmission and occultation of the beam through the reticle is used to generate calibration pulses, each representing a predetermined increment of movement of the calibration beam. The measuring portion of the beam is converted into parallel light beams which in turn are occulted by the workpiece being measured. A series of high and low square wave pulses are generated that are operative to start and stop the count of the calibration pulses. The count of the calibration pulses is directly related to the dimension of the workpiece being measured. A detector pulse enhancement circuit converts the measured signals to an accurate set of timing pulses independent of scan velocity, part size, part composition and interfering noise. The pulse generation utilizes a variable gain amplifier to provide a one-to-one output except upon the detection of a measuring signal.

Detector pulse enhancement circuit

An optical triangulation gauging system utilizing the position of a scanned laser beam to determine the position of an unknown surface or material thickness by optical triangulation. The scanned laser beam is split into two components by a beam splitter, one component, the reference beam, is passed through a calibration reticle having alternate opaque and transparent bands. The alternate transmission and occultation of the beam viewed through the reticle is used to generate calibration pulses that accurately describe the location of the gauging beam. The gauging component of the scanned beam is projected on to the surface to be measured. The back scattered light from this surface is viewed at a given angle, through a lens system that focuses the light onto a split photo detector. The position of the reference beam is interrogated as the scan beam image passes from one side of the split detector to the other. The reticle line spacing, the view angle of the lenses, and the optical path lengths provide an accurate measurement of surface movement independent of surface color or composition.

Optical triangulation gauging system

A non-contact optical gauging device in which a laser beam is deflected to produce a bidirectional scan. The beam is split; a measuring portion scans an object being inspected while the other portion scans a calibration reticle having alternating opaque and transparent bands. The alternating transmission and ocultation of the beam through the reticle is used to generate calibration pulses, each representing a predetermined increment of movement of the calibration beam. Ocultation of the measuring beam by the object being measured generates a signal which is used to control counting of the calibration pulses as an indication of the dimension being measured. Bidirectional averaging is employed to minimize errors due to object motion in the direction of beam scanning. Variations are disclosed in which two measuring beams and one or two calibration beams, are employed for measuring large objects or for dual axis measurement, the latter by orthogonal projection onto the object being measured.

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Columbus, OH, United States of America

David E Harris