Abstract: Embodiments include systems and methods for over-the-air testing of wireless systems. Embodiments comprise separated anechoic chambers containing wireless devices. The anechoic chambers are connected by propagation path corridors.

Abstract: Embodiments include an apparatus comprising a first part to be removably secured to a receiver hitch of a vehicle. The first part is removably integrated with a boom receiver. The boom receiver can be removably connected to a boom extending upward at an angle from the first part. An electric powered winch can be attached to the boom receiver. The winch includes a cable to hang down from the boom. Coupled to the cable is a device to connect an object to be moved by the apparatus.

Abstract: Methods and apparatus for analysis and design of radiation and scattering objects are disclosed. In one embodiment, unknown sources are spatially grouped to produce a system interaction matrix with block factors of low rank within a given error tolerance and the unknown sources are determined from compressed forms of the factors.

Abstract: Embodiments include an acoustic source for use in a hemi-anechoic chamber comprising a source assembly and a waveguide assembly for producing sound outside of a measurement hemisphere and channeling the sound into the measurement hemisphere. A waveguide end from which sound emanates is positioned close to the reflecting plane of the chamber and can approximate a point source.

Abstract: A video device is provided that reduces an original frame rate of video frames by grabbing only every nth video frame and substantially restoring the original video frame rate by reproducing a video frame up to n times or increasing the video frame rate by reproducing a video frame more than n times. In this way, the original frame rate is reduced without compression of the video data, and a higher frame rate may be restored without decompression.

Abstract: The present invention provides a method for reducing cogging in a linear motor and for mounting sensors to determine motion of the motor.

Abstract: Embodiments cause interaction of an ultra-wide band signal with a substance over a broad range of frequencies simultaneously to obtain a response signal whose distortion is indicative of a composition of the substance.

Abstract: An isolator is partially but substantially recessed in an acoustic floor and a leveling mechanism at least partially recessed in the acoustic floor is connected to the acoustic isolator to adjust the height of the acoustic floor when the floor is in place.

Abstract: The present invention provides apparatus and methods for indicating the existence of a critical event within a pilot house, including the existence of a condition of no motion.

Abstract: The present invention provides a linear motor and glide assembly for mounting a linear motor employing a unitary bearing rail structure and further providing heat compensation and compensation for thermal expansion, with further compensation provided to substantially reduce cogging.

Abstract: An apparatus and method for efficient heating fluid by using electromagnetic energy, the fluid is passed into a channeling structure within a region of space illuminated with electromagnetic energy uniformly, equally and simultaneously for rapid heating. Electromagnetic energy penetrates the fluid and causes it to heat. Structure in close proximity to the fluid in the channeling structure efficiently converts electromagnetic energy to heat to further heat the fluid to obtain a substantially homogeneous final desired temperature. The fluid is moved through the channeling structure creating turbulent to maximize the transfer of electromagnetic energy to the fluid.

Abstract: The present invention provides apparatus and methods for a ridge horn antenna that exhibits improved directivity and main lobe of the radiation pattern at the high end of the frequency range for which its gain remains usably high, while providing a relatively low VSWR across the frequency range of operation.

Abstract: Apparatus and methods of obtaining information concerning a substance (57) is provided by applying pulses (91, 92, 93) of electromagnetic energy to the substance (57) and evaluating the response of the substance to the electromagnetic energy. The pulses (91, 92, 93) generated by a source (51) are of sufficiently short duration to generate a very broad frequency band of energy. The pulsed energy is directed to the substance (57) to be processed and energy pulses (91, 92, 93) passing through the substance (57) are received (56) and analyzed (66) to determine the properties of substance (57).

Abstract: The present invention provides apparatus and methods for illuminating a dartboard comprising filtering of an illumination source from direct view by the player while protecting the illumination source from damage or breakage by darts or other objects.

Abstract: The present invention provides methods and apparatus for constructing an acoustic absorbing structure, such as a wall or enclosure, with removable and serviceable acoustic absorbing panels.

Abstract: Methods and apparatus for calibration of a scanned beam system are provided by sampling a calibration specimen containing an array of targets with a spacing between samples that is greater than the spacing between targets in the array and forming an image from the samples to reduce calibration specimen degradation and to magnify calibration errors to enable very fine calibration of the scanned beam system.

Abstract: The present invention provides a liner-securing device for securing a liner to a receptacle or surface of an object and receptacle with a liner-securing device for securing a liner to a perimeter of a receptacle comprising protrusions and recesses, wherein the protrusions are removably secured in the recesses and the liner material is firmly grasped between the surfaces of the protrusions and recesses.

Abstract: A novel microwave sensor (10, 60, 70, 90, 200, 250, 280) provides low-cost, robust measurement of the electrical properties of fluid substances. The sensor is suitable for use in an industrial vessel or pipe and employs parallel electrical transmission paths (12,14) that differ in electrical or physical length. The electrical length of each transmission path, which may be a two-way path caused by placing a reflective element in each path, is further determined by the electrical properties of the material under test. The frequency (f) of the signal being applied to the sensor is varied in a known manner such that the difference in the electrical lengths (&Dgr;L) of the transmission paths (12, 14) is caused to correspond to an odd integral multiple of a half wavelength. When the frequency is so adjusted and the signals that have traversed the transmission paths are allowed to coherently interfere with one another, then a minimum resultant signal or null is obtained.

Abstract: Computationally efficient DTMF detection methods and apparatus are presented that meet all of the ITU recommendations using the modified non-uniform DFT. The system of the present invention employs a high band filter block and two low band filter blocks to detect power at the 8 DTMF tones. The frame length of the high band filter blocks is one half the length of the low band filter blocks. The frame lengths are chosen to meet the ITU frequency selectivity requirements for all DTMF frequencies. The frames of the two low band filter blocks are staggered to produce outputs alternately, and are aligned with respect to the frame of the high band filter block to produce low band filter block outputs that coincided with the high band filter block outputs without the need for signal buffering. A system of power level tests are employed in conjunction with a system of timing tests to ensure that all ITU timing and frequency constraints are met.

Abstract: Computationally efficient DTMF detection methods and apparatus are presented that meet all of the ITU recommendations using the modified non-uniform DFT. The system of the present invention employs a high band filter block and two low band filter blocks to detect power at the 8 DTMF tones. The frame length of the high band filter blocks is one half the length of the low band filter blocks. The frame lengths are chosen to meet the ITU frequency selectivity requirements for all DTMF frequencies. The frames of the two low band filter blocks are staggered to produce outputs alternately, and are aligned with respect to the frame of the high band filter block to produce low band filter block outputs that coincided with the high band filter block outputs without the need for signal buffering. A system of power level tests are employed in conjunction with a system of timing tests to ensure that all ITU timing and frequency constraints are met.