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| Number | Title | Issue Date |
| 5799114 | System and method for stable analysis of sampled transients arbitrarily aligned with their sample points A method of stably identifying and characterizing a transient contained in a sampled set of data, the data representing a physical event, where alignment of the sample points with the transient is typically arbitrary. The method includes the steps of anal... | 08/25/1998 |
| 5790517 | Power sharing system for high power RF amplifiers A land mobile radio system (110) includes a plurality of radio channels (112), each radio channel (112) being interconnectable (115) to any one of a number, N, of combiners (114), and each combiner (114) being associated with a corresponding transmit ante... | 08/04/1998 |
| 5781452 | Method and apparatus for efficient decompression of high quality digital audio A method and apparatus for processing a digital data stream digital including a plurality of samples representing an audio signal. The plurality of samples are requantized. The plurality of requantized samples are filtered using a fast Fourier transform, ... | 07/14/1998 |
| 5757309 | Spatial frequency feature extraction for a classification system using wavelets An iterative process to determine the wavelet function and combination of ales of the function which provides data where there is a large separability compared to the separability of the data set prior to processing. Wavelets are selected for inclusion in... | 05/26/1998 |
| 5724270 | Wave-number-frequency adaptive beamforming Wave-number-frequency adaptive beamforming using a reduced rank k-ω matrix method. A spatial Fourier transform of the narrowband receiver outputs for the sensors in a linear array is taken to enter the wave number space and generate M independent spatial... | 03/03/1998 |
| 5717620 | Improved-accuracy fast-Fourier-transform butterfly circuit A channelizer (16) and combiner (22) in a cellular-telephone base station (10) are implemented in fast-Fourier-transform butterfly circuits (FIG. 4 ) in which outputs of adders (40, 46) are applied to successive adders (46, 50) in bit alignment. Although ... | 02/10/1998 |
| 5636244 | Method and apparatus for initializing equalizer coefficents using peridioc training sequences An apparatus and method for a data communications device such as a modem (100) to generate initial coefficient values for an equalizer (440) from a transmitted training signal received via a channel, in which the transmitted training signal has predetermi... | 06/03/1997 |
| 5574674 | Fourier transform processing for digital filters or other spectral resolution devices A process for suppressing the Gibbs phenomenon in a train of digital signals when such signals are undergoing a discrete Fourier transform or a fast Fourier transform without using the conventional windowing techniques wherein the original function define... | 11/12/1996 |
| 5450501 | Apparatus for the point-by-point scanning of an object A scanning microscope comprises a system (2, 3, 4) for concentrating a radiation beam from a radiation source (1) to form a scanning spot on an object (5). The radiation from the scanning spot is projected by a second optical system (6, 7) onto a radiatio... | 09/12/1995 |
| 5253192 | Signal processing apparatus and method for iteratively determining Arithmetic Fourier Transform A signal processing apparatus and method for iteratively determining the inverse Arithmetic Fourier Transform (AFT) of an input signal by converting the input signal, which represents Fourier coefficients of a function that varies in relation to time, spa... | 10/12/1993 |
| 5218558 | Output circuit of a charge-coupled device A detection system for detecting information using a charge-coupled device comprises a charge-coupled device supplied with a clock pulse having a predetermined frequency and producing an output signal pulse, a memory device for storing a set of orthogonal... | 06/08/1993 |
| 5146418 | Trigonometeric function generation for use in digital signal processing A sequence of N sine and/or cosine values, e.g. for Fourier Transforms, quadrature demodulation or test tone generation, is produced by interpolation from a geometrically-spaced table of initial sine values using a first interpolation formula. After being... | 09/08/1992 |
| 5047968 | Iterative image restoration device An image restoration device restores images which are viewed through an optical member and stored in a data processor. Processing means associated with the data processor iteratively determine, for each point in a viewed image, a factor which minimizes no... | 09/10/1991 |
| 5046116 | Symbol analyzing system and method with data exclusion and confidence factors A symbol analyzing system processes spectral power data of an input test symbol for deriving line width and line count information about the symbol, and for generating a reliability confidence for each line count. An excellent controller progressively red... | 09/03/1991 |
| 5034911 | Signal parameterizer A method and apparatus for parameterizing an input signal as a sum of N unrelated sine waves of various amplitudes, frequencies and phases using a 2N-order difference equation to describe the sine wave sum and converting the problem to a solution of the r... | 07/23/1991 |
| 4999799 | Signal processing apparatus for generating a fourier transform Apparatus for producing the Fourier coefficients of a time and/or space-varying input signal utilizes a bank of delay filters whose outputs are selectively connected to the inputs of a bank of accumulating circuit each of which produces one of the desired... | 03/12/1991 |
| 4992711 | Positioning controlling device A positioning controlling device for improving the machining accuracy of a work of a non-circular shape. A control axis is driven in accordance with an input function consisting of position instruction data corresponding to a machining shape of a work, an... | 02/12/1991 |
| 4961130 | Voltage inverter control applying real-time angle pattern determination A PWM inverter takes into account the harmonic distortion produced by a d.c. link which is not constant. The controller determines switching angles in real time eliminating the need for storing PWM patterns in ROM. This is made possible by a "quick" Fouri... | 10/02/1990 |
| 4899300 | Circuit to perform a linear transformation on a digital signal A circuit which performs a linear transformation on a digital signal. A linear transformation is defined by a graph whose nodes represent operations of addition or subtraction and the branches operations of multiplication by a determined coefficient. Acco... | 02/06/1990 |
| 4893266 | Alias tagging time domain to frequency domain signal converter A signal converter which inputs a time domain signal having a relatively large bandwidth and which outputs a frequency domain signal is disclosed. The time domain input signal is split into two identical portions. One portion is delayed relative to the ot... | 01/09/1990 |
| 4858164 | Complex arithmetic processing An integrated circuit chip for performing arithmetic calculations on complex numbers including a bidirectional input/output section for switching the direction of data flow on external buses, a multiplier and two adders located on two intersecting data pa... | 08/15/1989 |
| 4823297 | Digit-reversal method and apparatus for computer transforms A computer method and apparatus for permuting data values in fast transforms recognizing patterns in the relationship between indicies i and j to avoid calculating j when i equals j and avoid calculating j when j is less than i. The indicie j is calculate... | 04/18/1989 |
| 4713782 | Method and apparatus for measuring a transfer function A transfer function analyzer measures the real and imaginary parts of the Fourier transform of a stimulus signal applied to a device and of a resulting response signal. The integration which is performed as part of the Fourier transformation is performed ... | 12/15/1987 |
| 4648057 | Robust iterative technique for high-resolution spatial processing and spectral estimation A nonlinear technique for high-resolution data processing produces high-rlution power spectra from the output of a conventional processor. First, a "guess" of the spectral estimate is formed. Then the spectral estimate is convolved with the system respon... | 03/03/1987 |
| 4581715 | Fourier transform processor An improved Fourier transform processor is provided for generating frequency domain output signals in response to time domain input signals. Various configurations are provided. Processing on the fly as samples are received yields improvements such as gre... | 04/08/1986 |
| 4573197 | Method for automatic recognition of two-dimensional shapes A method of automatically recognizing objects in a digital image. The pixel coordinates of the boundary of the objects are identified and stored as data. A series of Fourier coefficients describing the boundary of the object are calculated and used to gen... | 02/25/1986 |
| 4559605 | Method and apparatus for random array beamforming A beamforming method and apparatus utilizing a plurality of sensing elements which are free to take up random positions. Each sensing element generates output signals in response to sensed radiation. The signals are fed to a data process or which generate... | 12/17/1985 |
| 4159528 | Parallel transfer analyzer for performing the chirp Z transform P-point transform analyzer using M N-point serial transform devices in parallel, the output signals therefrom being combined in K J-point serial transform devices in parallel, where M, N, K, and J are integers other than one such that M×N=K×J=P. Serial ... | 06/26/1979 |
| 4131764 | Arrangement for converting discrete signals into a discrete single-sideband frequency division-multiplex-signal and vice versa A multiplex system has an inverse Fourier transformer that is unequal to its forward one, therefore an optimum distribution of elements is possible.... | 12/26/1978 |
| 4101738 | Arrangement for processing auxiliary signals in a frequency multiplex transmission system A circuit for converting into an FDM format spatially separated signalling signals and pilot signals, comprises a digital filter bank for converting the signals into the FDM format. A receiver for separating the signalling signals and pilot signals from t... | 07/18/1978 |
| 4084251 | Fourier transform generator for bi-level samples Apparatus is provided for computing the Fourier coefficients of a finite block of bi-level bits. This is accomplished by formating the finite block of bits into an even function which is symmetrical about an origin such that both the data bits and a mirro... | 04/11/1978 |
| 4040091 | Direct electronic fourier transforms of optical images Method and apparatus for directly converting between optical images and the spatial Fourier transforms of optical images by interacting sound waves and light. Controlled sound waves couple with optical images, and electrical signals may be derived from th... | 08/02/1977 |
| 4018087 | Method and apparatus for testing the uniformity of a rotary body A method and apparatus for testing the uniformity of a rotary body whereby an electrical analysis signal is produced by travel measuring or force measuring transducers having an amplitude which varies as a function of the non-uniformities, multiplied by a... | 04/19/1977 |
| 4016514 | Diode coupled tapped acoustic delay line correlator and convolver A nonlinear delay line correlator and convolver is described which comprises a tapped, piezoelectric surface acoustic wave delay line and an array of series or parallel connected forward biased semiconductor diodes. An interdigital signal transducer is co... | 04/05/1977 |
| 3972259 | Production of pulse width modulation tonal effects in a computor organ In a computor organ, musical tones are generated by separately evaluating the constituent Fourier components of a musical waveshape and summing these to obtain the waveshape sample point amplitudes. The relative amplitude contribution of each Fourier comp... | 08/03/1976 |
