Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7966359 | Wideband frequency discriminator and radiolocalization receiver A Frequency discriminator based on a combination of Discrete Fourier Transform (DFT) operator and half-bin DFT operator, corresponding to a set of Twiddle factors with frequency double than the sampling frequency. The frequency estimators are so chosen as not to hav... | 06/21/2011 |
| 7366746 | Finite impulse response filter method and apparatus Finite response filters (FIRs) are divided into partial filters that filter a same portion of image data to generate partial filtered results. The partial filtered results may be saved and later retrieved to generate complete filter outputs. ... | 04/29/2008 |
| 7358854 | Method and device to identify a periodic light source In a device for location positioning, and more particularly, in a system for identifying an environmental source emitting a base frequency and waveform signal, a sensor (101) records an environmental source (105) emitting a base frequency and waveform ... | 04/15/2008 |
| 7356551 | Method and apparatus of retaining maximum speed of flip-flop metastability based random number generators An apparatus, system and method for retaining the maximum speed of flip-flop metastability based random number generators includes a fixed delay unit having an input for receiving a common signal from a digital signal generator, and a variable delay unit having an i... | 04/08/2008 |
| 7221721 | Frequency offset calculation method using log transforms and linear approximation A method for calculating frequency offset using arc tangent calculations according to real part and imaginary part input values received externally. The method includes converting arc tangent equations for determining frequency offset into equations to perform log c... | 05/22/2007 |
| 7193799 | Apparatus and method of removing resonance frequency in system An apparatus and a method to remove a resonance frequency of a system in which an unnecessary resonance frequency occurs in a head stack assembly (HSA) having a head for reading/writing data. The HSA is identified and filtered to prevent mechanical damage caused by ... | 03/20/2007 |
| 7152085 | Non-phase shifting bidimensional filter A band-pass filter with at least one passband, which is real, bidimensional, oriented along the phase axis and resulting from the product of two identical one-dimensional Hamming windows, the transfer function of each of these windows being: | 12/19/2006 |
| 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 |
| 6993541 | Fast hadamard peak detector A method and apparatus for performing a radix-4 fast Hadamard transform (FHT) with reduced complexity and for directly determining the maximum output of a fast Hadamard transform using either a radix-4 transform or radix-2 transform without actually generating the o... | 01/31/2006 |
| 6948043 | Management of a memory subsystem A method of optimizing performance of a memory subsystem in a computer system. This method including the step of informing the computer system of what type of memory module loading is present in the memory subsystem. The method also includes operating the memory sub... | 09/20/2005 |
| 6906560 | Phase-continuous frequency synthesizer A digitally controlled frequency synthesizer has a first direct digital synthesizer that generates a first phase-coherent, time-varying frequency, and a second direct digital synthesizer that generates an offset frequency waveform. A plurality of cascaded frequency ... | 06/14/2005 |
| 6898214 | Technique for monitoring SONET signal A technique for performance-monitoring of a standard SONET signal involves first converting the optical signal to an electrical signal, removing in the framing signal time slot the framing signal for leaving only the framing signal noise in such time slot, and separ... | 05/24/2005 |
| 6856926 | Frequency margin testing of bladed servers A frequency margin testing blade is adapted for use in a bladed server. The testing blade is further adapted to provide one or more output clock signals for use as clock inputs to one or more server blades internal to the bladed server in which the testing blade is ... | 02/15/2005 |
| 6847598 | Servo with digital filter to control gain in a frequency band where open loop characteristic is higher than the phase cross-over frequency and lower than resonance frequency The present invention implements a servo system which can support changes of the higher resonance frequencies of the actuator with a simple configuration at low cost. The servo system comprises a head 3 which at least reads a disk 1, a carriage 5 | 01/25/2005 |
| 6782045 | Frequency error measuring method and frequency error measuring device In a frequency spectrum analyzer (2) which receives a modulation signal previously measures the frequency (F). A synchronous detection frequency (B) is determined on the basis of the frequency (F). An adder (7) obtains the difference (G) between the sy... | 08/24/2004 |
| 6574592 | Voice detecting and voice control system The voice detecting device includes a voice frequency detector for detecting the frequency of the input voice, then discriminating whether the detected frequency falls within a preset frequency range of voices to be detected, and outputting the result of ... | 06/03/2003 |
| 6563869 | Digital signal processing circuit and audio reproducing device using it For a left-channel input audio signal, digital filters 30LL and 30LR are provided for reproduction of impulse responses used for locating an acoustic image outside the head of a listener, and for a right-channel input audio signal, digital filters 30RL an... | 05/13/2003 |
| 6169760 | Fast, highly accurate frequency measurement technique The frequency of a signal is determined using a signal filter having a signal filter skirt band frequency range wherein an intermediate fraction of an initial amplitude of an introduced signal passes through the signal filter. The magnitude of the transmi... | 01/02/2001 |
| 6119139 | Virtual windowing for fixed-point digital signal processors To determine the frequency content of a time series, a time series segment which spans a time interval is received. A time interval spanned by a symmetric tapered window with quantised elements is chosen such that the window time interval is greater than ... | 09/12/2000 |
| 6074086 | Synchronization of OFDM signals with improved windowing A mechanism for determining phases of a symbol for phase correlation is provided. The mechanism performs a symmetric apodizing window function on a symbol sample of a symbol having a symbol period of T and a time-offset symbol symbol sample offset from th... | 06/13/2000 |
| 6026418 | Frequency measurement method and associated apparatus The frequency measurement method and associated apparatus accurately determines the frequency of a periodic signal even if the frequency exceeds the nyquist frequency, typically established by the analog to digital ("A/D") converter used to sample the sig... | 02/15/2000 |
| 5920498 | Compression circuit of an adder circuit An adder circuit includes a 4-2 compression circuit in which a NAND signal of a first input signal and a second input signal and an exclusive-OR signal of the first and second signals are produced. When the exclusive-OR output is true, a third signal is o... | 07/06/1999 |
| 5920478 | Multi-input multi-output generic non-interacting controller A multi-input multi-output (MIMO) controller is configured as a generic, non-interacting, multivariable controller with adaptive capabilities. The controller transforms the coupled multivariable control problem to multiple decoupled single-input single-ou... | 07/06/1999 |
| 5761074 | Frequency data converter and meter apparatus In one data updating period, an edge pulse signal generator detects an edge of a pulse signal, and generates a one-shot pulse signal. A digital filter performs digital filter processing of the one-shot pulse signal, and outputs one frequency data. An aver... | 06/02/1998 |
| 5687104 | Method and apparatus for generating decoupled filter parameters and implementing a band decoupled filter A method (100) and data processing system (120) for filtering unfiltered signals (134) to produce filtered signals (136) in accordance with desired filter control parameters (124). Adjusted filter control parameters (130) are generated based upon user pro... | 11/11/1997 |
| 5583952 | Method and apparatus for representing an image by iteratively synthesizing high and low frequency components An apparatus for decompressing an image that has been compressed by an image compression system in which the image is first repetitively filtered in one direction to produce a series of sub-images which are then repetitively filtered in a second direction... | 12/10/1996 |
| 5576978 | High resolution frequency analyzer and vector spectrum analyzer A high resolution frequency analyzer analyzes frequency spectra of an incoming analog signal based on a fast Fourier transformer at ultra-high resolution without increasing the sampling number or time data of the analog signal. This series of input time d... | 11/19/1996 |
| 5566100 | Estimation of signal frequency using fast walsh transform A method of frequency estimation is disclosed which uses a Fast Walsh Transform (FWT) in place of a conventional Fast Fourier Transform (FFT) technique. The inventive method is based on a linear relationship between the unknown signal frequency and the se... | 10/15/1996 |
| 5555507 | Method for detecting non-linear behavior in a digital data transmission path to be examined The transmission path (4) is fed with a test signal (M'), which is generated from a sequence (m) of spectral components (S1 . . . S10), which are distributed equidistantly in the frequency domain, as the result of combining with an additional function (ZS... | 09/10/1996 |
| 5471133 | Digital device for measuring the frequency of an electrical signal In order to permit rapid, high-resolution measurement of the frequency of an electrical signal using a digital device, the electrical signal is fed to two linear-phase non-recursive digital filters (3, 20) with symmetrically distributed filter coefficient... | 11/28/1995 |
| 5420514 | Swept signal analysis instrument and method The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fas... | 05/30/1995 |
| 5343414 | Apparatus for adaptively tuning to a received periodic signal An apparatus for adaptively tuning to a received periodic signal. The apparatus preferably employs digital signal processing techniques for algorithmic generation of a sinusoidal estimated output signal, determines the difference between the estimated out... | 08/30/1994 |
| 5339251 | Apparatus for adaptively tuning to a received periodic signal An apparatus for adaptively tuning to a received periodic signal. The apparatus preferably employs digital signal processing techniques for algorithmic generation of a sinusoidal estimated output signal, determines the difference between the estimated out... | 08/16/1994 |
| 5300878 | Swept signal analysis instrument and method The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fas... | 04/05/1994 |
| 5249150 | Process and circuit to determine estimates of the instantaneous value of parameters of at least one sinusoidal signal with constant and known frequency which is an additive component of a measuring signal A circuit and method for iteratively estimating Fourier coefficients of one or more Fourier components of a measuring signal utilizes a filter to determine the Fourier coefficients for sampling time k-1. The coefficients are utilized to obtain an estimate... | 09/28/1993 |
| 5168213 | Swept signal analysis instrument and method The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments (10,38) are obviated by optimizing filter circuitry (24,32,34,46) and post-processing the IF signal using various techniques to compensate fo... | 12/01/1992 |
| 5165051 | Modified fast frequency acquisition via adaptive least squares algorithm This is a method and associated apparatus for accurately and quickly estimating the amplitude, frequency and phase of a signal of interest. The method comprises the steps of, inputting the signal of interest; generating a reference signal with adjustable ... | 11/17/1992 |
| 5068911 | Method and apparatus for representing an image An improved image compression system is disclosed in which the image is first repetitively filtered in one direction to produce a series of sub-images. These sub-images are then repetitively filtered in a second image to produce an image representation ha... | 11/26/1991 |
| 4658364 | Signal processing apparatus A signal processing apparatus has a novel arrangement wherein the frequency of each input signal is multiplied or divided in a frequency converter circuit whose multipliers or divisors are changed sequentially and repeatedly by a control circuit. The sign... | 04/14/1987 |
| 4523291 | Device for estimating the operating frequency of a source of recurrent signals A device for estimating the scanning frequency of an unfriendly tracking radar of the conically scanning type comprises input circuitry for eliminating the d-c component of a detected radar signal and a sampler deriving a train of amplitude pulses from th... | 06/11/1985 |
