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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 5691987 | Frequency-channel multiplexer and demultiplexer A circuit of low complexity which selects arbitrary channels from a plurality of multichannel input signals and generates from a plurality of individual frequency channels a plurality of output signals whose channel composition can be freely selected, con... | 11/25/1997 |
| 5666212 | Method of coding image segments of any shape A method of coding digital image data of an original image for transmission and reproduction. The original image is subdivided into partial image regions whose shapes are adapted to local image structures. For each partial image region, a set of two-dimen... | 09/09/1997 |
| 5663773 | Demodulator for a complex-value vestigial sideband signal In a demodulator for a complex-value vestigial sideband signal, a Nyquist slope filter which consists of two subfilters (Ra, Ia) is used, a filter device (FBASTP) being connected downstream of, or also capable of being integrated in, the said Nyquist slop... | 09/02/1997 |
| 5638073 | Method of linearizing variations in the transfer characteristic of a D/A converter, as well as an arrangement and use thereof A method is provided for linearizing variations in a transfer characteristic of a digital-to-analog (D/A) converter to which a digitized input signal is fed for being converted to an analog output signal. The method includes balancing the D/A converter so... | 06/10/1997 |
| 5625418 | Method and arrangement for inserting frame markers in data for transmission and for retrieving the data with the aid of such frame markers For the preparation of data such as digitized television channel signals or television channel bundles, useful data are periodically replaced by a frame marker (F) in at least one of N parallel partial data streams of different bit significance. For this ... | 04/29/1997 |
| 5615208 | Kalman filter for channel impulse-response adaption in receivers for TDMA mobile radio systems A method for adaptation to the time-variable channel impulse response during a burst in receivers for TDMA mobile radio systems, each burst including in the center a test sequence which is known to the receiver and by means of which an initial estimate of... | 03/25/1997 |
| 5601731 | Process for the production of an optoelectronic component having a defined axial variation of the coupling coefficient and a defined axial distribution of the phase shift The process for production of an optoelectronic component having a predetermined coupling coefficient distribution and a predetermined phase shift distribution includes providing a photomask defining lateral and axial geometry of the grating fields of the... | 02/11/1997 |
| 5600741 | Arrangement for coupling optoelectronic components and optical waveguides to one another The arrangement for coupling optoelectronic components and optical waveguides to one another includes a carrier substrate (11); at least one optoelectronic component (9) or one optical waveguide (1) secured on the carrier substrate (11) and at least one l... | 02/04/1997 |
| 5594393 | Microwave line structure A microwave line structure which has a first conducting track applied onto a substrate and a second conducting track which extends, supported on posts, at a distance above the first conducting track, a coplanar line being arranged, in addition to the micr... | 01/14/1997 |
| 5579154 | Optical fiber amplifier The invention relates to an optical fiber amplifier having an amplification waveguide, having a pump source and having a wavelength-selective coupler. The pump light from the pump source is coupled into the amplification waveguide via the coupler. A carri... | 11/26/1996 |
| 5577142 | Optical fiber transmitting and receiving communications device In the case of the above devices, exact adjustment is very important; however, the devices ought to be very compact. It is not sufficient to utilize the silicon etching technique for the precision. The optical transmitting element (LD) is situated on a fi... | 11/19/1996 |
| 5570137 | Device for digital demodulation of video and audio elements of television signal A device for digital demodulation of the video and audio elements of a television signal has a digital preprocessing stage for conditioning a complex digital signal for digital demodulation of a television signal at intermediate frequency, a first complex... | 10/29/1996 |
| 5568206 | Device for processing modulated rail analog television signal A device for processing a modulated real analog television signal has a digital preprocessing stage for conditioning a complex digital signal for digital demodulation of a television signal at intermediate frequency. The digital signal preprocessing is ca... | 10/22/1996 |
| 5566264 | Laser module including grooved silicon substrate, isolator and optical fiber The laser module couples its semiconductor laser to an optical device, e.g. an optical fiber, particularly a monomode fiber. The laser module includes a micromechanically structured silicon substrate (31) provided with an elongated groove (30) having a lo... | 10/15/1996 |
| 5541672 | Device for digital demodulation of video and audio elements of television signal A device for digital demodulation of the video and audio elements of a television signal has a digital preprocessing stage for conditioning a complex digital signal for digital demodulation of a television signal at intermediate frequency, mixing devices ... | 07/30/1996 |
| 5530471 | Radio and television distribution system A distribution system, useful with radio and television distribution, for distributing a signal having a plurality of channels includes a central station. The central station produces a first frequency division multiplexed signal in which signals from a p... | 06/25/1996 |
| 5461612 | Drop-and-add multiplexer for converting and processing a frequency multiplex signal A drop-and-add multiplexer for receiving an incoming FDM signal with a plurality of channels, for receiving signals of additional channels, and for outputting an outgoing FDM signal. The multiplexer includes at least one single channel filter for receivin... | 10/24/1995 |
| 5438500 | Switching regulator with a push-pull resonance converter A switching regulator having a series resonance push-pull converter (GW) and two clocked boost regulators (AR1, AR2) connected in series with the converter, wherein: the converter comprises a transformer (Tr) having two primary windings (w1, w2) which are... | 08/01/1995 |
| 5428323 | Device for compensating for temperature-dependent volume changes in a waveguide A waveguide assembly includes a waveguide having walls defining a cavity; and a frame surrounding the walls of the waveguide. The frame has a coefficient of thermal expansion less than that of the waveguide. First and second connecting spacers are attache... | 06/27/1995 |
| 5313502 | Arrangement for imaging a useful signal from the frame of a first digital signal at a first bite rate into the frame of a second digital signal at a second bite rate A circuit arrangement for imaging a useful digital signal from a frame of a first digital signal having a first bit rate into a frame of a second digital signal having a second bit rate, where the useful digital signal had been written into a first elasti... | 05/17/1994 |
| 5287454 | Method for acquiring network knowledge about a digital transmission network Method for acquiring network knowledge in the individual operating locations of a digital transmission network having a plurality of network nodes. Following a computer outage, digital signal connections set up via central computers can no longer be recon... | 02/15/1994 |
| 5192906 | Switching regulator with current limiting shutdown A switching regulator employing pulse width control or pulse frequency control of an actuator includes a current limiting device which receives a signal that is a function of current through the actuator and a signal that is a function of turn-on pulses f... | 03/09/1993 |
| 5185642 | Improved method and arrangement for processing output signals of a fiber ring interferometer A method and circuit arrangement for determining angular velocities by means of an optical fiber ring interferometer includes, in addition to, a phase modulator for modulating light waves passing through an optical fiber ring of the interferometer at a ph... | 02/09/1993 |
| 5182745 | Data transmission method and arrangement For the transmission of data in the form of difference signals between subscribers connected to a bus, bus couplers are provided which permit switching between transmit and receive operation. The bus couplers each include a multiplexer connected in such a... | 01/26/1993 |
| 5177700 | Non-recursive half-band filter A non-recursive half-band filter having a filter length N and complex coefficients for receiving either a real input signal s(kT) or a complex input signal s(2kT) and for processing and converting the received input signals into either a complex output si... | 01/05/1993 |
| 5157698 | Method for clock pulse synchronization A method of synchronizing clock pulses of a clock pulse generator used in a receiver of digital data transmissions. The received signal is demodulated by multiplying it in quadrature by an output signal of a carrier oscillator to obtain demodulated in-pha... | 10/20/1992 |
| 5103220 | Method of expanding a three-stage regular switching array A method of expanding a regular three-stage switching array. Original switching blocks of the first and third stages having a smaller number of crosspoints are enlarged to switching blocks having a larger number of crosspoints, by combining the original s... | 04/07/1992 |
| 5095416 | Push-pull converter current limiter Method and apparatus for output current limitation of a push-pull d.c. voltage converter. The input current of the push-pull d.c. voltage converter is detected and integrated each switching cycle of push-pull switches in the current paths leading to the t... | 03/10/1992 |
| 5068817 | Non-recursive half-band filter with complex valued coefficients for complex input and output signals A non-recursive half-band filter having a filter length N includes a receiver unit for receiving a complex input signal having a real component and an imaginary component at a sampling frequency fA, where fA=1/T; and a processing and converting unit for p... | 11/26/1991 |
| 5015872 | Method and circuit arrangement for generating a phase shifted clock pulse signal A method and apparatus of generating a clock pulse signal, which is shifted by any desired, settable phase value between 0 and -π by using two conventional phase shifters which can be set continuously between 0 and -π/2, wherein the two input ports of t... | 05/14/1991 |
| 5012390 | Mounting and connection system for electrical communications equipment A mounting and connection system for electrical communications equipment of the type including a plurality of plug-in modules which are each provided with electrical components and with multi-pin connectors, and which are inserted from the front into a ma... | 04/30/1991 |
| 5001413 | Method of operating a switching regulator and apparatus therefor A switching regulator including a direct voltage source for producing an input voltage, an electronic switch connected between the voltage source and an output for switching the input voltage to the output, a pulse width modulator connected for controllin... | 03/19/1991 |
| 4994954 | Control circuit for regulating a current flow through a load and use thereof A regulator controls the DC current flowing through a load, where the current is initially supplied by an AC voltage source and thereafter rectified, the control being proportional to the load current. In one embodiment, the source or emitter potential of... | 02/19/1991 |
| 4987361 | Switching regulator having a constant current through its inductance A switching regulator which substantially suppresses effects on the output voltage of noise in a direct input voltage includes a direct voltage source for producing an input voltage, and output, and a controllable electronic switch connected between the v... | 01/22/1991 |
| 4985903 | Bus coupling circuit A bus coupling circuit couples data between a transmitting subscriber and a receiving subscriber using a data transfer bus. Each subscriber includes a bidirectional driver for transmitting and receiving data. Each bidirectional driver includes an apparatu... | 01/15/1991 |
| 4982172 | Method of creating a measuring signal access to a waveguide arrangement A method of creating an access to a waveguide arrangement in order to couple measuring signals into and/or out of the waveguide arrangement includes providing a cover for covering an opening in a waveguide wall of the waveguide arrangement at a location s... | 01/01/1991 |
| 4968928 | Method and arrangement for suppressing noise signals in a load supplied with direct voltage by a final controller A method and arrangement for suppressing noise having an alternating voltage component in a load supplied with a direct voltage signal by way of a control loop including a final controller connected to the load. The final controller is connected to the lo... | 11/06/1990 |
| 4964116 | DS3 - line interface linear array (lila) In a line interface circuit for binary data signals means are provided for compensating varying lengths of line in the receiving and/or transmission path. The output signal of a line equalizer controls a variable impedance circuit in such a way that atten... | 10/16/1990 |
| 4953118 | Nonrecursive half-band filter A nonrecursive half-band filter which permits the conversion of a complex-value input signal into a complex-value output signal. The pulse response of the filter is modulated onto a complex carrier at a frequency of 1/4 or 3/4 of the sampling rate, the ze... | 08/28/1990 |
| 4939734 | Method and a system for coding and decoding data for transmission A method and a system for processing a data stream for transmission. In order to process the data stream for transmission, particularly for satellite transmission, data substreams are formed and then difference coded and convolutionally coded. After the d... | 07/03/1990 |
