Abstract: A wireless communication system for simultaneously communicating overlapping wideband and narrowband signals. The system includes a transmitting station for embedding one or more narrowband signals (3-5) in a wideband signal (1) having a frequency spectrum encompassing the narrowband signals, and transmitting the resulting composite wideband signal (2). The system also includes a receiving station for receiving a composite wideband signal (60) and separating the embedded narrowband signal(s) (62, 63) from the wideband signal (61). In one embodiment, a cellular radiotelephone base station (35) is operable as both the transmitting and receiving station, communicating with remote subscriber units (29-31) having conventional transceivers (FDMA, TDMA and/or CDMA).

Abstract: In a quantization noise reduction circuit (200), a feedback signal (W)is added to an input signal (X) to the quantization circuit to reduce quantization noise. The feedback signal is generated as a filtered difference between a sample of a N bit signal (X') and a time coincident sample of a M bit quantized signal, where M<N. The feedback signal is subtracted from the input signal (X) prior to quantization thereby introducing out of band noise into the input signal for reducing in band noise in the quantized signal (Y).

Abstract: A pattern recognition system is utilized in a supplementary inflatable restraint (SIR) system to distinguish between deployment and non-deployment events. The pattern recognition system preferably includes dedicated hardware or a microprocessor programmed to perform a neural network simulation utilizing crash data in the form of vehicle acceleration data. Training and trial vectors are generated from the data to train and, subsequently, test the neural network.

Abstract: A cellular radiotelephone communication system cell site equipment is provided. The cell site equipment includes a radio frequency transmitter operating as one signal frequency source. In addition, the cell site equipment includes a first and a second signal combiner device tuned to a first and a second signal frequency, respectively. Further, the cell site equipment includes a radio frequency switching mechanism, operatively coupled to the radio frequency transmitter, the first signal combiner device, and the second signal combiner device, for coupling the radio frequency transmitter to either of the first and the second signal combiner devices. In one embodiment, each signal combiner device includes a resonant cavity for isolating a signal frequency source from other signal frequency sources and a coupling for coupling the isolated signal frequency source to a common transmitter output.

Abstract: Briefly described the present invention is a feed forward amplifier network (200) employing a frequency swept pilot tone signal (212) in order to reduce the distortion generated by the network's power amplifier (202). Initially a composite input signal (216) comprising either wide (520) and/or narrow (510) bandwidth modulation formats is input into the network (200). In addition, the frequency swept pilot tone (212), generated for example by a variable frequency oscillator (213), is injected into the input path of the power amplifier (202). Thereafter, distortion cancellation is employed to generate an amplified output signal (217) having output components (510,520) which replicate those within the input signal (216). Thereafter, pilot tone power is detected (by 215) within the amplifier passband where the output components (510,520) are absent, in order to ascertain the average pilot tone power remaining within the amplified output signal (217).

Abstract: The present invention discloses a method and apparatus for optimizing the performance of a power amplifier circuit. In accordance therewith, one of the intermodulation products generated during a power amplifier's operation is selected. This selection is based upon the intermodulation product's amplitude. Next, the intermodulation product's amplitude is compared to a predetermined threshold. Based upon this comparison, various power amplifier circuit operating parameters are altered in order to improve the circuit's intermodulation performance or to maximize its operating capacity.

Abstract: A feed forward distortion minimization circuit which receives an input signal and routes the input signal along two signal paths is disclosed. One path, the main signal path, includes a distortion generator such as, for example, a power amplifier, which generates an output signal having a distortion component. The other path, the feed forward signal path, includes a delay line responsive to the input signal for feeding the input signal forward, without distortion. The output signal from the distortion generator is combined with a fed forward input signal to form an error signal representative of the distortion component. A feedback circuit is employed to detect a DC current or RF voltage proportional to the error signal's signal strength and to adjust the amplitude and the phase of signals in the feed forward or main signal paths to reduce the carrier to distortion ratio of the error signal. Thereafter, the error signal is subtracted from the main signal path to cancel any distortion components therein.

Abstract: A static oxygenator for oxygenating a liquid, particularly a suspension culture of animal cells in a liquid culture medium, comprised of a bottom gassing portion comprised of generally concentric vertically oriented hollow cylinders of porous gas-permeable, liquid-impermeable material, and an upper degassing section comprised of vertical extensions of the concentric cylinders such that at least one liquid overflow weir is provided at the juncture between the bottom and upper sections. Gas directed into the bottom of the annular space between the concentric cylinders rises therein and, across the porous material, oxygenates liquid in contact therewith or in proximity thereto up to the point where the liquid overflows the weir, and the gas then continues up the annular space in the vertical extensions for degassing through the porous material above the liquid level.

Abstract: An oxygenator, particularly for proving oxygen and/or carbon dioxide or other gases to culture medium used in the in vitro culture of animal cells, comprised of a collection of elongate gas-permeable, liquid-impermeable tubes through which oxygen-containing gas flows and permeates through the tube walls to provide bubble- and foam-free oxygen gas to medium in contact with or in proximity to the tubes, the individual tubes having an outside diameter of less than about 1 mm and a wall thickness of from about 0.1 mm to about 0.25 mm, the tube collection preferably be radially spread apart at at least one point along its length.

Abstract: Very wide field of view optical surveillance is realized without scanning or moving parts by means of an integrated multiaperture optical system. The system utilizes light gathering optics in the form of an array of eyelets or lens apertures that direct in-coming light onto a detector layer. The detection layer consists of individual detectors, more than one to a lens. Under the detector layer there is a correlation layer, which contains a memory cell for each detector and circuitry which connects to neighboring memory cells according to a hard wired program. Below the correlation layer is a processing layer which contains microprocessor circuitry allowing further processing of the acquired information. Outlines of objects seen by the system are defined by the microprocessor circuitry using an edge detecting routine. A detected object is identified by correlation with a single number recognition coefficient.

Abstract: The invention is a controlled ferroresonant power supply with an improved feedback circuit resulting in improved output stability. The feedback circuit is responsive to the low voltage secondary output of the power supply to provide a variable output signal to activate the switch which controls the resonant winding circuit. The improved feedback circuit is responsive to the rectified AC low voltage secondary output for only a portion of its frequency period.

Abstract: This invention relates to compositions of matter useful as anti-diarrheal agents and to the method of controlling and treating diarrhea in warm blooded animals. The active anti-diarrheal agents are substituted anilino nicotinic acids, and salts thereof and ester and hydrazine derivatives of said acids.

Abstract: This invention relates to compositions of matter useful as anti-diarrheal agents and to the method of controlling and treating diarrhea in warm blooded animals. The active anti-diarrheal agents are substituted N-aryl-anthranilic acids, and salts thereof and ester and hydrazine derivatives of said acids.