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| Number | Title | Issue Date |
| 6052702 | Decision feedback filter device in the frequency domain A decision feedback filter device which has a forward filter (FF) and a feedback filter (FB) for the production, from input symbols (x(n)), of the corresponding decisions (d(n)), the forward filter (FF) receiving the input symbols at input, and the feedba... | 04/18/2000 |
| 6035312 | Adaptive filter An adaptive filter includes n (n is a positive integer) blocks, m filter circuits, a matrix switch, an adder, and a controller. The blocks divide a continuous string of a plurality of input signals into a plurality of groups each made up of k (k is a posi... | 03/07/2000 |
| 6028929 | Echo canceller employing dual-H architecture having improved non-linear echo path detection An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive non-linear echo path response detection. The echo canceller circuit comprises a first digital filter having non-adaptive tap coefficients to simulate an ech... | 02/22/2000 |
| 6028895 | Distortion corrector for two data flows A system for equalizing an input signal including a datastream modulated on a carrier, with respect to both transmission channel distortions and local receiver distortions, includes a network for frequency downshifting the input signal, a controlled non-r... | 02/22/2000 |
| 6026419 | Single tone signal detector A signal detector for detecting a narrow-band signal of a desired frequency, using an adaptive type FIR filter having two filter coefficients, is disclosed. Using this filter, the input signal of a shift register which delays the signal, is estimated by r... | 02/15/2000 |
| 6009448 | Pipelined parallel-serial architecture for a modified least mean square adaptive filter A modified least mean squares adaptive filter method and apparatus is disclosed. The filter coefficients used to perform the FIR multiplications in a least mean squares adaptive filter are time dependent upon a time index. Each tap of the FIR section util... | 12/28/1999 |
| 6004022 | Product sum operation apparatus A product sum operation apparatus in which an increase in the circuit scale of the product sum operation apparatus can be suppressed and the operation speed can be increased even when the number of bits to be operated is increased. A partial product gener... | 12/21/1999 |
| 5999956 | Separation system for non-stationary sources A source separation system (10) processes input signals formed by mixtures of primary signals originating from sources and estimates the primary signals so that the estimates do not differ even in the presence of non-stationary input signals. The system i... | 12/07/1999 |
| 5995542 | Filter circuit arrangement having a plurality of cascaded FIR filters The filter circuit arrangement provides the properties of an FIR filter of length N, with K (Kࣙ2) cascaded FIR-filter members. One FIR-filter member (5.K) is formed as an equalizer filter of length NA and the remaining FIR-filter members (5.1... | 11/30/1999 |
| 5987485 | Adaptive digital filter In adaptive digital filtering, first steps of adapting a filter coefficient dependent on a received data sample, and second steps of filtering by applying an adapted filter coefficient to a received data sample, are alternated so that adapted filter coeff... | 11/16/1999 |
| 5983254 | Zero-latency pipeline architecture for digital filters In a digital filter, data is received through an input path, and data in the filter is transported to an output through an output path. At least one delay element is disposed on the input path, and at least another delay element is disposed on the output ... | 11/09/1999 |
| 5978417 | Adaptive cable equalizer An adaptive cable equalizer is provided with a simple architecture, wherein a single control structure: controls the adaptation of the filter for compensating for cable length while simultaneously compensating for process and temperature variations; optim... | 11/02/1999 |
| 5978824 | Noise canceler A noise canceler of the present invention includes a signal-to-noise power ratio estimator to which a main signal and a reference signal are input. The estimator 10 estimates the sinal-to-noise power ratio of the main signal from the mean power of a desir... | 11/02/1999 |
| 5978489 | Multi-actuator system for active sound and vibration cancellation A multi-actuator system for active sound and vibration cancellation utilizes an LMS type algorithm having an adaptive filter. However, the error signal rather than the input is filtered through an adjoint filter of the error channel to drive an adaptive f... | 11/02/1999 |
| 5974434 | Method and apparatus for automatically tuning the parameters of a feedback control system A new technique for adjusting the parameters of a feedback controller. A linear feedback controller includes proportional, integral and derivative (PID) controllers but is not limited to them. The feedback controller may utilize non-linearity in its contr... | 10/26/1999 |
| 5963594 | Vector tracking filter A new filter that may be employed in timing recovery circuits, and automatic gain control circuits, employs a so-called vector tracking filter (VTF). The VTF includes a complex filter with a time constant so long that it might be considered a leaky integr... | 10/05/1999 |
| 5960091 | Adaptive removal of resonance-induced noise Noise is removed from the digitized output of a sensor, subject to undesired resonance, even when the resonant frequency is unknown or drifts, with sufficiently low phase delay for the sensor to be used in closed-loop control. A very narrow notch filter w... | 09/28/1999 |
| 5951626 | Adaptive filter An adaptive filter and method that proportionately adjusts individual tap gain distributors such that the individually adjusted tap gains are not necessarily equal to one another and that the average of tap gains remains substantially constant. The filter... | 09/14/1999 |
| 5946351 | Tap selectable decision feedback equalizer A decision feedback equalizer receiver that assigns a number F of feedforward filter taps and optimizes digital receiver performance in multipath channel environments, where F is an integer less than a memory length of a radio channel. The feedforward fil... | 08/31/1999 |
| 5943367 | Transmission system using time dependent filter banks In source coding, use can be made of switching filter banks in order to adapt the filter bank to the properties of the signal to be coded. If it is not allowed that the switching introduces transient phenomena in the reconstructed signal, so-called bounda... | 08/24/1999 |
| 5931892 | Enhanced adaptive filtering technique A signal represented as a matrix of input values is adaptively filtered using a processor with a multimedia extension unit. A plurality of coefficients are loaded into a first vector register and input values are loaded into a second vector register. Next... | 08/03/1999 |
| 5926405 | Multidimensional adaptive system A multi-dimensional adaptive method and system which can be forced to converge to any predetermined solution of interest. Disturbances are input to the system along with reference signals. Error sensors (detectors) receive the disturbances and the cancell... | 07/20/1999 |
| 5912828 | Equalizer filter configuration for processing real-valued and complex-valued signal samples An apparatus and method of implementing an equalizer filter configuration including a plurality of memory blocks and a plurality of filter blocks. The respective pluralities of memory blocks and filter blocks are coupled so that the equalizer filter confi... | 06/15/1999 |
| 5910909 | Non-linear digital filters for interlaced video signals and method thereof A structure and a format for providing a video signal encoder under the MPEG standard are provided. In one embodiment, the video signal interface is provided with a decimator for providing input filtering for the incoming signals. In one embodiment, the c... | 06/08/1999 |
| 5910993 | Apparatus and method for actively reducing vibration and/or noise In apparatus and method for actively reducing a periodic vibration and/or noise, a divergence determinator is provided in which a presence or absence of a higher order divergence of a control of the reduction of the periodic vibration and/or noise is dete... | 06/08/1999 |
| 5909384 | System for dynamically adapting the length of a filter A novel system by which the utilization of a central processing unit (CPU) in performing filtering operations can be reduced by shortening the filter's length thus degrading the performance of the system down to a predetermined level or threshold. The pre... | 06/01/1999 |
| 5905659 | Training a recursive filter by use of derivative function A method of training a recursive filter comprises updating recursive parameters of the filter with delta values computed from sampling of an error signal and obtaining derivative terms of the output signal with respect to the parameters. Adaptation using ... | 05/18/1999 |
| 5901075 | Performance of an adaptive weight FIR filter having a timeshared tap weight processor An apparatus and a scheme for adapting a plurality of tap weights in an FIR filter wherein tap weights are adapted for a current data cycle utilizing a current subset of data and the tap weights are adapted for a next data cycle utilizing a next subset of... | 05/04/1999 |
| 5900006 | Median filtering method and apparatus using a plurality of processing elements An apparatus for median filtering a sequence of input values comprises (N+1) number of processing elements coupled in series for storing (N+1) number of input values included in a values group and providing a median value thereof, N being a positive even ... | 05/04/1999 |
| 5901175 | Dynamically adaptive equalizer system and method An adaptive filter or equalizer for digital data communication includes, a first cascade circuit connected to operate as a digital finite-impulse-response (FIR) filter, the first cascade circuit having a respective first single input for receiving samples... | 05/04/1999 |
| 5894429 | Method for creating a digital control signal A method and system for converting an input signal into a dynamically-controlled digital output signal. A sensitivity and a threshold level of a digital input signal is adjusted. An absolute value or a constant polarity of the adjusted digital input signa... | 04/13/1999 |
| 5894495 | Adaptive digital filter This invention relates to adaptive digital filters for echo cancellation in a bi-directional data transmission channel. Substantial hardware savings for a digital adaptive filter are possible, if hardware structures for performing filter operations are sh... | 04/13/1999 |
| 5889869 | Invisible acoustic screen for open-plan offices and the like The invisible acoustic screen for reducing sound leakage from handsfree telephones, loudspeaking computer terminals, and the like in a workspace includes a sound reducing apparatus comprising: a sound producing loudspeaker; a cancelling loudspeaker; a sen... | 03/30/1999 |
| 5870433 | Method of processing signals in a viterbi decoder according to delayed decision feedback sequence estimation (DDFSE) algorithm A method of digital telecommunication via an electrical cable is provided, whereby the symbols of a data stream to be transmitted are supplied as a transmission signal to a transmission path, after undergoing a digital-to-analog conversion. The transmissi... | 02/09/1999 |
| 5862516 | Method of non-harmonic analysis and synthesis of wave data A novel method of non-harmonic analysis of a physical waveform is disclosed. A digitized wave data is multiplied by a first sine and a first cosine function having a first predetermined period, respectively, and the resulting products are respectively sum... | 01/19/1999 |
| 5854814 | Digital transmission system with improved decoder in the receiver A digital transmission system, such as a mobile radio system, having a transmitter for transmitting codewords which are derived from a digital signal, and a receiver for receiving codewords, the receiver including a decoder with a prediction filter which ... | 12/29/1998 |
| 5842158 | Method for adaptive filtering of well logging data The invention described herein provides for an intelligent or "adaptable" filtering method that could be applied when filtering log data. In the present invention, for a given filter model, the adaptive filtering technique differentiates between true chan... | 11/24/1998 |
| 5841856 | Hands-free telephone set A hands-free telephone set which is connected to both an analog cellular scheme line and a digital cellular scheme line includes first and second FIR filters. The first FIR filter is connected to a transmission path in an analog line connection state to c... | 11/24/1998 |
| 5831880 | Method for processing a signal in a CSD filter and a circuit therefor A method for processing a signal in a CSD filter includes the steps of obtaining real coefficients optimized to desired filter characteristics, calculating scaling factors for each real coefficient which minimizes errors between the real coefficients and ... | 11/03/1998 |
| 5828589 | Self-adaptive trans-hybrid balance filter An adaptive balance filter includes a transmission path, a reception path, and an adaptive filter having a signal output, a coefficient output for outputting filter coefficients, an error signal input, and a signal input coupled to the transmission path. ... | 10/27/1998 |
