Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7761495 | Fourier transform processor The present invention is two-iteration Fourier transform processor for performing Fourier transform of N data inputs into N data outputs. The processor comprises a plurality of two-iteration radix-r modules and a combination phase element. Each radix-r module compri... | 07/20/2010 |
| 7543009 | Fractional fourier transform convolver arrangement An M-point Fractional Fourier is described using several 2M-points traditional Fourier transforms. The signal path is fed through a series of blocks including a first multiplier, a zero pad, an FFT, a second multiplier, an IFFT, a first half element, and a third mul... | 06/02/2009 |
| 7529789 | Method for representing complex numbers in a communication system A method for storage for complex numbers that employs a shared exponent field is disclosed. Rather than each floating point component of an complex number having its own distinct signed mantissa and exponent fields, each component includes a distinct signed mantissa... | 05/05/2009 |
| 7472152 | Accommodating fourier transformation attenuation between transform term frequencies A Fourier transformation algorithm implementation in which accommodation is provided for the output attenuation occurring when an input signal falls intermediate two terms of the transformation output series in its frequency. Corrected Fourier transformation terms, ... | 12/30/2008 |
| 7440989 | Kernel function approximation and receiver A Fourier transformation arrangement usable in an electronic warfare radio receiver for analyzing spectral content of multiple transmitter-sourced brief duration incoming signals for their signal characteristics. The disclosed Fourier transformation arrangement incl... | 10/21/2008 |
| 7430575 | One-dimensional fourier transform program, method and apparatus A one-dimensional Fourier transform program for quickly performing a one-dimensional Fourier transform intended for a scalar computer comprises a step of resolving a data length N of one-dimensional data into the product of factors N1×N2×. . ... | 09/30/2008 |
| 7411187 | Ion trap in a semiconductor chip A micrometer-scale ion trap, fabricated on a monolithic chip using semiconductor micro-electromechanical systems (MEMS) technology. A single 111Cd+ ion is confined, laser cooled, and the heating measured in an integrated radiofrequency trap etched from a doped galli... | 08/12/2008 |
| 7395292 | Method for displaying spectral trends in complex signals A method for displaying changes in spectral content of data signals over periods of time using a computer system. The method includes the steps of transforming time segments of digitized data signals into a frequency based spectral representation of the digitized da... | 07/01/2008 |
| 7376173 | Unambiguously encoding and decoding signals for wireless channels A method encodes a sequence of blocks of input bits to be transmitted over a wireless channel. Each block of input bits is converted to a codeword, and each codeword is mapped to multiple sub-blocks of complex numbers. Each sub-block is multiplied by a disambiguatin... | 05/20/2008 |
| 7362822 | Recursive reduction of channel state feedback Feedback bandwidth may be reduced in a closed loop MIMO system by Householder transformations and vector quantization using codebooks. ... | 04/22/2008 |
| 7330866 | System for frequency-domain scaling for discrete cosine transform A system for frequency-domain scaling for DCT computation. Scale factors are applied to coefficients during the final steps of composition of 2-point DCTs. The number of multiplications and required precision are reduced. Fixed values for various scale factors can b... | 02/12/2008 |
| 7321665 | Method of and apparatus for extracting watermark from repeatedly watermarked data A method of extracting a watermark from watermarked data includes extracting a plurality of watermarks from the watermarked original data, calculating reliability of each of the extracted watermarks, and determining a final watermark based on the calculated reliabil... | 01/22/2008 |
| 7315636 | Generation of reconstructed images A method and system are presented for fast generation of one or more 2D DRRs of an object. 3D scan data of the object (such as CT scan data) are generated. A 3D fast Fourier transform F(u,v,w) is computed for a 3D scan volume f(x,y,z) within the 3D scan data, the sc... | 01/01/2008 |
| 7313250 | Method and system for frequency domain watermarking using a phase based filter signature The present invention is a digital watermarking technique Phasemark™ for image authentication. Using a signature extracted from the original image, the present invention hides an encoded version of the signature back into the original image, forming the watermarke... | 12/25/2007 |
| 7302100 | Method for increasing detectable light energy without changing shape content in radial and angular or rotational analysis of images for shape content and matching A segmented radial spatial light modulator has an active optic area comprising a plurality of radially extending active optic modulators disposed at various angular orientations with respect to a central axis. The segmented radial spatial light modulator is used in ... | 11/27/2007 |
| 7295680 | Embedding and detecting digital watermark in image An apparatus for embedding digital watermark information in an image, includes an image divider dividing the image into a plurality of partial images; and an embedder embedding in each of the partial images a digital watermark which indicates the digital watermark i... | 11/13/2007 |
| 7292166 | Analog/digital converter and program therefor There is provided an analog-to-digital conversion apparatus that corrects digital data output from a plurality of analog-to-digital conversion units. The analog-to-digital conversion apparatus includes an interleaving unit operable to align the digital data respecti... | 11/06/2007 |
| 7289552 | Efficient joint detection K data signals, or bursts, are transmitted over a shared spectrum in a code division multiple access communication format. A combined signal is received and sampled over the shared spectrum, as a plurality of received vector versions. The combined signal includes th... | 10/30/2007 |
| 7248980 | Method and apparatus for removing quantization effects in a quantized signal One embodiment of the present invention provides a system that reconstructs a high-resolution signal from a set of low-resolution quantized samples. During operation, the system receives a time series containing low-resolution quantized signal values which are sampl... | 07/24/2007 |
| 7233968 | Fast fourier transform apparatus A data transform system performs FFT and IFFT computations with respect to N data points. The data transform system performs radix-R (R is an integer) butterfly computation in parallel by use of M arithmetic elements. Serial and parallel computation structures a rec... | 06/19/2007 |
| 7227902 | Method and apparatus for digital channelisation and de-channelisation The present invention relates generally to the problem of filtering, decimation or interpolation and frequency conversion in the digital domain, and more particularly to its use in wideband multichannel receiver, channelization, and transmitter, de-channelization, s... | 06/05/2007 |
| 7206707 | Wideband digital IFM receiver An IFM receiver includes a hybrid for outputting I and Q signals from a received input signal; a first ADC for digitizing the I signal to produce a first digital signal at a sampling rate of 1/τ, and a second ADC for digitizing the Q signal to produce a second digi... | 04/17/2007 |
| 7203718 | Apparatus and method for angle rotation An angle rotator uses a coarse stage rotation and a fine stage rotation to rotate an input complex signal in the complex plane according to an angle θ. The coarse stage rotation includes a memory device storing pre-computed cosine θM and sine θM | 04/10/2007 |
| 7200630 | Inverse fourier transform method, phase characterization method of optical components from transmission and group delay measurements as well as a system for performing the method A new method for characterizing the amplitude and phase distributions of the light propagating through arrayed-waveguide gratings is presented. The new method is based on the IFT. A very good agreement of the results obtained from the IFT method in comparison with O... | 04/03/2007 |
| 7197095 | Inverse fast fourier transform (IFFT) with overlap and add A system for efficiently filtering interfering signals in a front end of a GPS receiver is disclosed. Such interfering signals can emanate from friendly, as well as unfriendly, sources. One embodiment includes a GPS receiver with a space-time adaptive processing (ST... | 03/27/2007 |
| 7158569 | Methods of digital filtering and multi-dimensional data compression using the farey quadrature and arithmetic, fan, and modular wavelets Methods are presented for calculating the wavelet filters and their inverses which rely on a new method of sampling (UA, TA, A) either digital or analog data. These methods combine and extend to give novel procedures for non-reversible multi-dimensional data compres... | 01/02/2007 |
| 7146394 | Watermark detection An improved method and arrangement for detecting a watermark in an information (e.g. image or video) signal are disclosed. The detection is more reliable and less vulnerable to image processing by partitioning the image into a sequence of blocks having a predetermin... | 12/05/2006 |
| 7127065 | Watermark embedding and detection In a method and arrangement for embedding and detecting a watermark in an information signal, the embedded watermark (Wi) is selected (13) from a plurality of watermarks (W1 . . . WN) in dependence upon a property P of the sig... | 10/24/2006 |
| 7123788 | Apparatus for monitoring optical frequencies of WDM signals The present invention relates to a wavelength division multiplexed (WDM) apparatus for monitoring optical frequencies, allowing optical channel frequency monitoring using the crossover property of an arrayed-waveguide grating and pilot tones that are in wide use in ... | 10/17/2006 |
| 7120659 | Apparatus, methods, and computer program products for determining the coefficients of a function with decreased latency The present invention provides apparatus, methods, and computer program products that can decrease the latency with which the coefficients of a function representative of signal are determined. Specifically, the apparatus, methods, and computer program products of t... | 10/10/2006 |
| 7113967 | Efficient quantum computing operations A method of performing a quantum Fourier transform in a quantum computing circuit is disclosed. The method includes forming a quantum computing circuit as a collection of two-qubit gates operating on a sequence of input qubits. Auxiliary qubits are then interacted w... | 09/26/2006 |
| 7110567 | Optimized detection of a watermark in an information signal The invention relates to a method of detecting a watermark W, formed by a set of coefficients, in an information signal S, said watermark W and said information signal S being configured in the form of matrices SM M*M. The coefficients of the Fourier transform matri... | 09/19/2006 |
| 7103223 | Apparatus and method for radial and angular or rotational analysis or images for shape content and matching A segmented radial spatial light modulator has an active optic area comprising a plurality of radially extending active optic modulators disposed at various angular orientations with respect to a central axis. The segmented radial spatial light modulator is used in ... | 09/05/2006 |
| 7092429 | Multi-pass frequency hop-acquisition correlator A multi-pass frequency hop timing acquisition correlator that produces a more accurate time estimate from the fast acquisition frequency hop signal is disclosed. The time estimate produced by the multi-pass acquisition correlator is more accurate than the ¼ hop est... | 08/15/2006 |
| 7079260 | Optical profile determining apparatus and associated methods including the use of a plurality of wavelengths in the reference beam and a plurality of wavelengths in a reflective transit beam An optical profile determining apparatus includes an optical detector and an optical source. The optical source generates a transmit beam including a plurality of wavelengths, and generates a reference beam including the plurality of wavelengths. Optical elements di... | 07/18/2006 |
| 7079704 | Objective method and system for estimating perceived image and video sharpness A method and system for estimating the quality of video data without gaining access to the source data, are configured to perform a Fast Fourier Transform (FFT) from at least some of the pixel values of the image in at least the horizontal direction, and at most, in... | 07/18/2006 |
| 7072290 | Single user detection base station A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectru... | 07/04/2006 |
| 7062523 | Method for efficiently computing a fast fourier transform A method for computing an out of place FFT in which each stage of the FFT has an identical signal flow geometry. In each stage of the presently disclosed FFT method the group loop has been eliminated, the twiddle factor data is stored in bit-reversed manner, and the... | 06/13/2006 |
| 7047268 | Address generators for mapping arrays in bit reversed order A method and apparatus to reduce the amount of required memory and instruction cycles when implementing Fast Fourier Transforms (FFTs) on a computer system is described. The invention optimizes FFT software using in-place bit reversal (IPBR) implemented on a process... | 05/16/2006 |
| 7028063 | Method and apparatus for a DFT/IDFT engine supporting multiple X-DSL protocols A Fourier transform processor utilizing discrete circuits each of which is configurable for processing a wide range of sample sizes. A single pipeline supports multiplexed bi-directional transformations between for example the time and frequency domains. In an embod... | 04/11/2006 |
