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| Number | Title | Issue Date |
| 7725515 | Digital filter for reducting blocking artifacts in images The present invention relates to a digital data filtering circuit. This digital data filtering circuit is able to implement the calculation steps of a discrete transform of a set of 8 original data (w), and calculating an inverse discrete transform of the set of tra... | 05/25/2010 |
| 7292651 | Pilot-aided channel estimation for OFDM in wireless systems A method and apparatus for pilot-symbol aided channel estimation in a wireless digital communication system which transmits packets of N OFDM data blocks, each data block comprising a set of K orthogonal carrier frequencies. At the transmitter, pilot symbols are ins... | 11/06/2007 |
| 7290021 | Method and apparatus for parallel signal processing Disclosed is a method of providing signal processing operations, including convolution/filtering, where each parallel stream is processing signals at a lower rate than the signal data rate itself while still resulting in an overall signal processing rate suitable fo... | 10/30/2007 |
| 7251271 | Digital filter design Method and apparatus for designing digital filters are provided. One method includes the steps of determining a real-valued discrete-frequency representation of a desired digital filter and transforming this discrete-frequency representation into a corresponding dis... | 07/31/2007 |
| 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 |
| 7246143 | Traced fast fourier transform apparatus and method A Fast Fourier Transform (FFT) arrangement for use in those situations in which not all of the outputs are desired is controlled in such a fashion that at least those multiplications (and possibly those additions) are not performed which do not contribute toward the... | 07/17/2007 |
| 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 |
| 7180946 | Circuit for filtering video data in the frequency domain The present invention relates to a filter circuit for a set of original data (X0–X7) able to implement in series the steps of discrete transformation (DCT2), correction (ZER) of odd transformed data and inverse discrete transformation (IDCT... | 02/20/2007 |
| 7126979 | System and method to autonomously and selectively jam frequency hopping signals in near real-time The system and method autonomously and selectively jams frequency-hopping signals in near real-time by incorporating a fundamental change in the detection and reaction technology, to provide a reaction time that is short enough, within milliseconds or less, to captu... | 10/24/2006 |
| 7110944 | Method and apparatus for noise filtering A method of filtering noise from a mixed sound signal to obtain a filtered target signal, includes inputting the mixed signal through a plurality of sensors into a plurality of channels, separately Fourier transforming each the mixed signal into the frequency domain... | 09/19/2006 |
| 7099369 | Method and apparatus for surgical high speed follower jamming based on selectable target direction A Method and Apparatus for Surgical High-speed Follower Jamming Based on Selectable Target Direction is disclosed. The system and method of the present invention automatically detects and jams sudden, short duration communications signals in near real time, in a com... | 08/29/2006 |
| 7099396 | Multicarrier modulation using weighted prototype functions A method of modulating a multicarrier signal involves obtaining a set of 2M representative complex coefficients of transmitted data. 2LM linear combinations are calculated so as to leave 2M obtained complex coefficients. Coefficients of balancing used in these combi... | 08/29/2006 |
| 7095779 | Method and apparatus for automatic jammer frequency control of surgical reactive jammers A Method and Apparatus for Automatic Jammer Frequency Control of Surgical Reactive Jammers is disclosed. The system and method to autonomously and selectively jam frequency-hopping signals in near real-time. The system has the ability to automatically detect short d... | 08/22/2006 |
| 7072418 | Method and apparatus for performing Nyquist folding frequency modulation A method and apparatus for re-modulating an RF carrier modulated signal using a Nyquist folding frequency modulation technique. The method modulates a digitized RF carrier modulated signal with a digital sequence of {1,−1,1,−1, . . . }, where the center frequenc... | 07/04/2006 |
| 7069212 | Audio decoding apparatus and method for band expansion with aliasing adjustment An audio decoding apparatus decodes high frequency component signals using a band expander that generates multiple high frequency subband signals from low frequency subband signals divided into multiple subbands and transmitted high frequency encoded information. Th... | 06/27/2006 |
| 7069284 | Apparatus and method for correcting signal imbalances using complex multiplication A complex multiplier is described for filtering a signal in the frequency domain. In one embodiment, additional, independent frequency coefficients are supplied by the complex multiplier so that gain and/or phase of the signal may be independently modified (i.e., ga... | 06/27/2006 |
| 7058571 | Audio decoding apparatus and method for band expansion with aliasing suppression A wideband, high quality audio signal is decoded with few calculations at a low bitrate. Unwanted spectrum components accompanying sinusoidal signal injection by a synthesis subband filter built with real-value operations are suppressed by inserting a suppression si... | 06/06/2006 |
| 6963649 | Noise cancelling microphone An improved noise canceling microphone is provided including robust design features and advanced noise control and speech discrimination convergence characteristics. Two adaptive controllers are used to ensure robust performance in quickly changing acoustic environm... | 11/08/2005 |
| 6917946 | Method and system for partitioning filter rules for multi-search enforcement A method and system for storing a plurality of filter rules in a computer system is disclosed. The plurality of filter rules uses at least one range of values in at least one dimension. The method and system include separating a portion of the plurality of filter ru... | 07/12/2005 |
| 6912474 | Method and apparatus for high-speed synchronous digital acquisition derived in real -time from analog samples A method and apparatus for real-time derivation of precise digital clock edges and synchronous logic samples from a digital signal having a clock channel and at least one data channel acquires a plurality of temporally offset analog samples during each of a sequence... | 06/28/2005 |
| 6772182 | Signal processing method for improving the signal-to-noise ratio of a noise-dominated channel and a matched-phase noise filter for implementing the same A matched-phase noise filter includes an analog to digital converter (ADC) for receiving an analog composite, noise-dominated signal containing a signal of interest and producing a digital composite signal, an input/output port receiving the digital composite signal... | 08/03/2004 |
| 6625629 | System and method for signal processing using an improved convolution technique A system (100) for signal processing using one or more filters includes a controller (102) that partitions an impulse response of a filter into a plurality of impulse response blocks and calculates a Discrete Fourier Transform (DFT) of each impulse respon... | 09/23/2003 |
| 6324559 | Odd-transform fast convolution The present invention relates generally to the problem of filtering, decimation or interpolation and frequency conversion in the digital domain, and more particularly to the use of the stand-alone or improved modified fast convolution algorithm in wideban... | 11/27/2001 |
| 6304133 | Moving average filter A moving averaging filter which does not propagate a calculation error is provided reducing the size of the hardware. This moving average filter has a data holding unit for holding multiple successive data, a coefficient storing unit for storing coefficie... | 10/16/2001 |
| 6134571 | Implicit DST-based filter operating in the DCT domain An implicit DST-based filter having characteristics defined by a linear convolution kernel that may be causal or noncausal-symmetric. The filter filters an information signal composed of blocks of discrete cosine transform (DCT) coefficients to generate a... | 10/17/2000 |
| 6128011 | Cross-platform digital signal processing designs using Java and C A platform-independent software-implemented digital signal processing system in a computer system. The digital signal processing system is comprised of a digital signal processing unit implemented in C program code which receives data and applies a proces... | 10/03/2000 |
| 6094667 | Time spread root Nyquist filter In a method is disclosed for transmitting and receiving a transmission data signal, after the transmission data signal is generated, it is modulated by a first time spread root Nyquist filter to generate a transmission signal. The signal is then transmitt... | 07/25/2000 |
| 6073152 | Method and apparatus for filtering signals using a gamma delay line based estimation of power spectrum A signal processing system for generating a signal component reduced output signal by estimating the power spectrum of a non-stationary signal component within a non-stationary input signal is disclosed. The estimated power spectrum of the signal componen... | 06/06/2000 |
| 6036351 | Advanced signal processing filter A filter, and method of the filtering, for increasing the signal to noise tio of relatively small and constant amplitude signals in the presence of relatively large and varying amplitude signals. The filter produces a filtered power level az pr... | 03/14/2000 |
| 5926783 | Switchable dividing network The switchable dividing network includes two individual filters whose center frequencies are selected from the group consisting of fa /8, 3fa /8, 5fa /8 and 7fa /8. The passband of its transmission function is s... | 07/20/1999 |
| 5917738 | Removing the gibbs phenomenon in fourier transform processing in digital filters or other spectral resolution devices A process for eliminating 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 conventional windowing techniques wherein the train of digital signals is ... | 06/29/1999 |
| 5889688 | Frequency domain kernel phase processor A frequency domain kernel phase processor comprises an input buffer to st Fourier coefficients input from a Fourier transform of a communications signal. A communications signal suitable for processing by the present invention typically comprises a desir... | 03/30/1999 |
| 5768165 | Digital time signal filtering method and device for transmission channel echo correction A method for filtering a time signal (e(t)) sampled in blocks of N samples (e(n),e(k)) uses a transfer function defined in the frequency domain by LN samples (H(K)). The transfer function is filtered by a time window (g1) of width N, and a frequency subsa... | 06/16/1998 |
| 5671168 | Digital frequency-domain implementation of arrays A method for the digital frequencey domain implementation of receiving arrays. The steps of the method are as follows: a discrete time input signal is transformed into its spectral components and the redundant spectral components are removed. Products of ... | 09/23/1997 |
| 5524149 | Circuit arrangement for echo suppression In an adaptive filter a frequency domain filter is used to enhance the convergence properties of the filter for strongly correlated signals. To reduce the amount of delay in the filter the impulse response of said filter for small values of time is generated b... | 06/04/1996 |
| 5479440 | Apparatus and method for impulsive noise cancellation The present invention comprises an apparatus and method for substantially canceling impulsive noise from data. Such substantial cancellation is achieved by converting the time-domain data into its corresponding frequency spectrum, such that the impulsive ... | 12/26/1995 |
| 5473555 | Method and apparatus for enhancing frequency domain analysis A signal processing technique allows accurate interpolation between points of a sampled frequency domain function. A time-based sampling process samples a time waveform of duration T having a sub time interval T'. A signal processor applies a discrete Fou... | 12/05/1995 |
| 5327366 | Method for the adaptive filtering of a transformed signal in sub-bands and corresponding filtering method A method of filtering in sub-bands that eliminates or greatly restricts aliasing effects is disclosed. First, a source digital signal is transformed into at least two distinct frequency sub-bands. Next, each of the frequency sub-bands is filter processed.... | 07/05/1994 |
| 5319676 | Digital pre-modulation filter A digital pre-modulation filter with a finite impulse response having the value k(t)=h(t).multidot.w(t), where h(t) represents an impulse response of the type that is customary for a modulator, for generating in response to data signals an angle-modulated... | 06/07/1994 |
| 5301266 | Apparatus to improve image enlargement or reduction by interpolation An image interpolation apparatus receives an image signal in the frequency domain. The image signal is supplied to a filter circuit. The output of the filter circuit is transformed by a two-dimensional fourier transformation circuit into a filtered image ... | 04/05/1994 |
