Class 708/318 - Lattice

Subclass of Class 708 - Electrical computers: arithmetic processing and calculating
Definition: Subject matter in which the filter has four computational
No. of patents: 34
Last issue date: 10/02/2007

Number	Title	Issue Date
7277472	Estimation method of flat fading channel in CDMA communication system and apparatus for the same The invention provides a method and apparatus for estimating flat fading channel in CDMA communication system, said method is implemented by using an adaptive forward prediction technique based on lattice filter and maximum likelihood technique of Viterbi algorithm....	10/02/2007
7268696	Directional signal and noise sensors for borehole electromagnetic telemetry system An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Directional detectors provide a signal channel with reduced noise content and improved n...	09/11/2007
7203714	Logic circuit A CMOS logic circuit is disclosed wherein the number of kinds of basic parts is suppressed to five to allow designing of a circuit which operates at a high speed and repetitiveness of wiring lines is increased to allow designing of a circuit which is simple in circu...	04/10/2007
7190842	Elementary cell of a linear filter for image processing The present invention relates to an elementary cell of a linear filter for image processing, as well as to a corresponding module, element and process. The cell comprises a data circulation output and a calculation output, as well as a main delay line and an auxilia...	03/13/2007
7043517	Multiply accumulator for two N bit multipliers and an M bit addend A multiply accumulator performs a multiplication-and-addition operation for a first multiplier with N bits, a second multiplier with N bits, and an addend with M bits, wherein M is larger than 2N. The multiply accumulator includes a modified Booth encoder and a mult...	05/09/2006
6711599	Limit-cycle-absent allpass filter lattice structure A lattice-based second-order allpass filter (200) providing a digital filter, absent of limit cycles, includes interconnected quantizers(214, 224), delays (232, 240), multipliers (210, 220), and adders (208, 216, 228) for defining ...	03/23/2004
6539412	Discrete wavelet transform apparatus for lattice structure A discrete wavelet transform apparatus for a lattice structure is disclosed. This apparatus includes first through M-th lattice lattices installed in series along the length of a selected filter and each having an upper signal path and a lower signal path...	03/25/2003
6442581	Lattice structure for IIR and FIR filters with automatic normalization Apparatus providing a "reverse lattice" structure for IIR and FIR filters, which exhibits desirable scaling properties at no additional computational or memory cost. The reverse lattice structure implementation of an IIR filter scales down signals at sect...	08/27/2002
6108680	System and method for filtering using an interleaved/retimed architecture An interleaved all-pass section for a lattice wave digital filter, comprises a first input carrying an interleaved signal, a first adder/multiplier network (AMN) connected to said first input, a second adder/multiplier network (AMN), and a delay element c...	08/22/2000
5999954	Low-power digital filtering utilizing adaptive approximate filtering A method of digital filtering and a digital filter having a filter response with a predetermined filter order. The filter response produces a predetermined set of filtered output samples defining an output signal from a received input signal. The differen...	12/07/1999
5959698	Poly phase filter for dot sequential color difference signal conversion A poly phase filter for converting a sampling frequency of a digital video signal to perform a dot sequential color difference signal conversion operation, the digital video signal including a luminance signal and a color difference signal, the color diff...	09/28/1999
5936461	Charge domain signal filter The object of the present invention is to obtain a charge domain signal filter by composing an digital filter circuit with analog/digital mixed circuit and by introducing the analog processing into the process of multiplication and addition consuming the ...	08/10/1999
5587910	Vehicle navigation system with non-overflow digital filter A vehicle navigation system uses a one-multiplier Gray-Markel filter. The sign parameter of each stage of the filter is selected by an algorithm which limits the maximum signal passing through the filter, thereby preventing overflow....	12/24/1996
5519879	Integrated circuit having CPU and DSP for executing vector lattice propagation instruction and updating values of vector Z in a single instruction cycle An integrated data processing system includes a shared internal bus for transferring both instructions and data. A shared bus interface unit is connected to the shared internal bus and connectable via a shared external bus to a shared external memory arra...	05/21/1996
5249205	Order recursive lattice decision feedback equalization for digital cellular radio A received time division multiple access (TDMA) signal having a time slot comprised of a plurality of symbols including at least one sequence of synchronizing symbols and a plurality of data symbols is demodulated by adaptively filtering the received sign...	09/28/1993
5028931	Adaptive array processor An off-line processor arrangement for a broadband accelerated convergence adaptive antenna array wherein signals from a plurality of antenna elements are applied to respective identical tapped delay lines (T) the outputs of which are fed through individua...	07/02/1991
4884230	Digital lattice filter A digital lattice filter, comprising a plurality of identical stages each having a pair of inputs for receiving input signals and a pair of outputs for supplying output signals, these stages being connected in a cascade arrangement, each stage consisting ...	11/28/1989
4825396	Digital circuit for sampling rate variation and signal filtering and method for constructing the circuit A digital circuit for sampling rate variation and signal filtering includes an input, an output, a lattice wave digital filter having a plurality of filter branches connected to the input, the filter branches each having at least two series-connected filt...	04/25/1989
4796216	Linear predictive coding technique with one multiplication step per stage A digital filter for synthesized speech includes a full adder (72) that is multiplexed to perform multiplication and addition/subtraction operations. The inputs of the adder (72) are multiplexed by multiplexers (90) and (92). The adder (72) calculates Y-v...	01/03/1989
4740906	Digital lattice filter with multiplexed fast adder/full adder for performing sequential multiplication and addition operations A lattice filter for processing lattice equations includes a fast adder (78) for adding partial products to partially perform a multiplication step. A full adder (44) is provided for completing the multiplication and then adding the product with a previou...	04/26/1988
4700323	Digital lattice filter with multiplexed full adder A system for processing a plurality of Equations includes a single full adder (44) which has the A input thereof multiplexed by multiplexer (62) and the B input thereof multiplexed by a multiplexer (94) and a multiplexer (66). The multiplexer (94) is oper...	10/13/1987
4695970	Linear predictive coding technique with interleaved sequence digital lattice filter An LPC digital lattice filter includes a full adder (44) which has one input thereof multiplexed with a multiplexer (46) and the other input thereof multiplexed by a multiplexer (50). Combination of the multiplication and addition steps with the full adde...	09/22/1987
4686644	Linear predictive coding technique with symmetrical calculation of Y-and B-values A digital lattice filter includes a Y-adder (44) and a B-adder (106). The Y-adder (44) calculates the Y-values for a linear predictive coding voice compression technique and the B-adder (106) calculates the B-values. Each of the calculated B-values output...	08/11/1987
4581747	Arrangement for equalizing the variable attenuation of a signal on a communication line Disclosed is a digital arrangement utilizing linear predictive coding for equalizing over a desired frequency spectrum the variable attenuation of a voice-frequency message signal transmitted on a communication line. The arrangement comprises a digital si...	04/08/1986
4554858	Digital filter for an electronic musical instrument A digital filter imparting a desired tone color to the tone signal is realized by the combination of a digital pole filter and a digital zero filter capable of controlling a pole and a zero in an amplitude-frequency characteristic respectively. The amplit...	11/26/1985
4544919	Method and means of determining coefficients for linear predictive coding An improved method and means of determining reflection coefficients that characterize an electrical signal that obtains characteristics of an all-zero inverse lattice filter. The reflection coefficients are obtained by filtering the signal, sample the fil...	10/01/1985
4443859	Speech analysis circuits using an inverse lattice network An adaptive filter suitable for speech analysis which is constructable on a silicon chip. The filter has a single multiplier and a single adder in series together with appropriate registers or memories so that the output of the adder is either looped back...	04/17/1984
4398262	Time multiplexed n-ordered digital filter An n-ordered digital filter is disclosed in the form of a Partial Autocorrelation (PARCOR) lattice structure having two multipliers and two adders. Time multiplexing eliminates the use of individual multipliers and adders for each order of the filter. Spe...	08/09/1983
4389540	Adaptive linear prediction filters An improved linear prediction filter based on the PARCOR lattice structure of Itakuro and Saito, replaces the correlator by a recursive loop including a coefficient generator, coefficient corrector, and attenuator, such that the corresponding filter outpu...	06/21/1983
4378469	Human voice analyzing apparatus The analyzing apparatus includes a ten stage, all-zero lattice digital filter formed on a single semiconductor chip. A partial correlation coefficient is derived in each stage of the lattice filter in improved coefficient circuitry and the analyzer provid...	03/29/1983
4352162	Digital filter A digital filter for a voice synthesis circuit which operates on the basis of the principle of linear predictive coding. More particularly, a digital filter of the lattice type for voice synthesis on the basis of the principle of linear predictive coding ...	09/28/1982
4344148	System using digital filter for waveform or speech synthesis A system using a digital filter for generating complex waveforms, such as human speech. The filter has a multiplier, an adder coupled to the output of the multiplier and various delay circuits coupled to the output of the adder. A latch memory is coupled ...	08/10/1982
4340781	Speech analysing device Computation of the partial correlation coefficients (PARCOR Ki) of a signal, using less cascaded hardware, is implemented by first deriving a sequence of auto-correlation coefficients (vj) which are then transformed into a sequence o...	07/20/1982
4209844	Lattice filter for waveform or speech synthesis circuits using digital logic A digital filter of the type which may be used in circuits for generating complex waveforms, such as human speech. The filter has a multiplier, an adder coupled to the output of the multiplier and various delay circuits coupled to the output of the adder....	06/24/1980

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Class 708/318 - Lattice