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Document Title 

9032007 
Distributed processing system and method for discrete logarithm calculation
Distributed processing system and method for discrete logarithm calculation. The speed and resource efficiency of discrete logarithm calculation may be improved by allowing a plurality of... 

8996599 
Arithmetic device for calculating between physical quantities including units, and database used thereby
An arithmetic device includes a database that stores a first indicator representing a base unit included in a unit system being assigned with a prime number other than a prime factor of a prefix,... 

8892620 
Computer for Amdahlcompliant algorithms like matrix inversion
A family of computers is disclosed and claimed that supports simultaneous processes from the single core up to multichip Program Execution Systems (PES). The instruction processing of the... 

8060550 
Method and apparatus for integer transformation using a discrete logarithm and modular factorization
Transforming an integer comprises receiving the integer, where the integer can be expressed as a modular factorization. The modular factorization comprises one or more factors, where each factor... 

7801938 
Numeric value display method
A numeric value display method uses a display processing section. When an operation to read out a numeric value from storage means and display it is executed, if the numeric value has a greater... 

7711764 
Pipelined real or complex ALU
A method and ALU for implementing logarithmic arithmetic in a multistage pipeline is described herein. According to one embodiment, a master function is decomposed into two or more subfunctions.... 

7689639 
Complex logarithmic ALU
The present invention describes a method and apparatus for performing logarithmic arithmetic with real and/or complex numbers represented in a logarithmic format. In one exemplary embodiment, an... 

6961744 
System and method for generating an integer part of a logarithm of a floating point operand
A logarithm unit computes an integer part of a logarithm of a floating point operand according to an embodiment of the present invention. The logarithm unit analyzes a format of the floating point... 

6678710 
Logarithmic number system for performing calculations in a processor
A computation unit employs a logarithmic number system that uses a logarithmic numerical representation that differs from an IEEE standard representation to improve the efficiency of computation,... 

6591361 
Method and apparatus for converting data into different ordinal types
A method and apparatus that converts integer numbers to/from floating point representations while loading/storing the data. The method and apparatus perform this conversion within a central... 

6502118 
Fast system and method for producing a logarithmic signal approximation with variable precision
A system and method for producing an output logarithmic digital signal from an input digital signal having a plurality of bit values in which the output logarithmic signal has a precision defined... 

6466633 
Methods and apparatus for implementing a receiver filter with logarithmic coefficient multiplication
A method of filtering a signal, the method including the steps of sampling analog input signal, thereby providing a purality of digital complex input signal samples the each of the samples... 

6345285 
Logarithmic value calculation circuit
Logarithm of data x being input is taken to calculate a decibel value y. The input value x is separated into mantissa value a and exponent value b by a separator or on the basis of an expression... 

6233595 
Fast multiplication of floating point values and integer powers of two
A method for performing fast multiplication in a microprocessor is disclosed. The method comprises detecting multiplication operations that have a floating point operand and an integer operand,... 

6085209 
Method and system for performing an IIR filtering operation
A method and system for an IIR filter are provided. A sequence of input signals is converted to a first sequence of log signals, while a sequence of feedback signals is converted to a second... 

6065031 
Log converter utilizing offset and method of use thereof
A digital log converter is provided which includes a comparator (10) and a log signal generator (20). Upon receiving a digital input signal (12), the comparator (10) determines whether an upper... 

6055556 
Apparatus and method for matrix multiplication
A system (400) alternatively performs real matrix operation in a first mode or performs complex matrix multiplication in a second mode. One input matrix (e.g., {B}) stays in a plurality of memory... 

6023719 
Signal processor and method for fast Fourier transformation
With reference to FIG. 1 signal processor (10) for performing transformations of sets of input data points comprises a memory for storing a first half input data points and a second half input... 

6003058 
Apparatus and methods for performing arithimetic operations on vectors and/or matrices
A multiplymultiplyaccumulate (MMA) system (10) efficiently evaluates matrix products X=F*C. Matrix C is dissected into submatrices A and B taking advantage of symmetry in C. LOG unit (14)... 

5961579 
Apparatus using a logarithm based processor
An apparatus that includes a logarithm based processor (216) having at least one digital logarithm converter (202) and a power amplifier (208) responsive to the logarithm based processor (216). 

5951628 
Method and system for performing a convolution operation
A method and system for a convolution operation in a digital signal processor (DSP) are provided. The convolution operation is performed in a logarithmic number system (LNS) domain. The DSP... 

5951629 
Method and apparatus for log conversion with scaling
A parallel processor (110) operates in the LOG domain. A LOG converter (114) receives input data in the NORMAL and converts it to the LOG domain for processing in the parallel processing units... 

5948052 
Apparatus using a logarithm based processor and an audio amplifier
An apparatus that includes a logarithm based processor (216) having at least one digital logarithm converter (202) and an audio amplifier (208) responsive to the logarithm based processor (216). 

5944774 
Methods apparatus and computer program products for accumulating logarithmic values
The sum of a plurality of logarithmic numbers is determined by expressing the logarithmic numbers as one of a predetermined values. For example, the numbers may be analog values which may be... 

5936871 
Method and system for performing an L2 norm operation
A method and system for an L2 norm operation are provided. A sequence of input signals is converted to a sequence of log signals. The sequence of log signals is distributed through a data pipeline... 

5920596 
Apparatus for amplifying a signal using a digital processor
An apparatus for amplifying a signal that includes a digital processor (12) producing a first digital signal (20) and a second digital signal (22), a pulse width modulator (32) receiving the first... 

5801974 
Calculation method and circuit for obtaining a logarithmic approximation value
The present invention discloses a calculation method utilizing a circuit and a circuit for obtaining a logarithmic approximation value. The circuit minimizes the error in calculating a logarithmic... 

5798957 
LNSbased computer processor and method of use thereof
An LNSbased computer processor is provided for performing highspeed calculations that involve special function values. Special functions include transcendental and hyperbolic functions. The... 

5771391 
Computer processor having a pipelined architecture and method of using same
A computer processor that performs operations in a logarithmic number system (LNS) domain includes a log converter (20) which generates log signals, a data pipeline (22), a plurality of processing... 

5761104 
Computer processor having a pipelined architecture which utilizes feedback and method of using same
A computer processor that performs operations in a logarithmic number system (LNS) domain includes an input log converter (20), a feedback log converter (303), a first data pipeline (304), a... 

5726924 
Exponentiation circuit utilizing shift means and method of using same
A circuit and method for computing an exponential signal xg is provided. The circuit includes a logarithm converter which converts an input signal to binary word that represents the logarithm of... 

5721696 
Method and system for performing an FIR filtering operation
A method and system for an FIR filter are provided. A sequence of input signal is converted to a corresponding sequence of log signals. FIR filtering coefficients are then added to each log signal... 

5703801 
Logarithm/inverselogarithm converter utilizing secondorder term and method of using same
A converter which may be used for implementing either logarithmic or inverselogarithmic functions is disclosed. The converter includes a memory, a multiplier, and two adders. The memory stores a... 

5696986 
Computer processor utilizing logarithmic conversion and method of use thereof
A computer processor for performing mathematical operations includes a logarithm converter which generates log values on a data bus, a plurality of processing elements connected to the data bus,... 

5675822 
Method and apparatus for a digital signal processor having a multiplierless computation block
A digital signal processor having a multiplierless computation block (140) is accomplished by storing approximations of computed logarithms in memory (160, 162). When two pieces of data (114, 116)... 

5608663 
Computational array circuit for providing parallel multiplication
A computational array circuit (100) performs parallel multiplications with an adder array (140). The computational array circuit converts a floating point input value to a logarithmic input value.... 

5600581 
Logarithm/inverselogarithm converter utilizing linear interpolation and method of using same
A converter which may be used for implementing either logarithmic or inverselogarithmic functions includes a memory, a multiplier, and an adder. The memory stores a plurality of precomputed... 

5570310 
Method and data processor for finding a logarithm of a number
A data processor and method are used to find logp (x) wherein p is a numerical base and x is a floating point value. The method begins by deriving a number y from the quantity x wherein the number... 

5524089 
Logarithm computing circuit for fixed point numbers
A logarithm computing circuit for fixed point numbers is disclosed that has: a shift number detection circuit that inputs a number of a fixed point representation, detects a shift number of the... 

5363321 
Digital circuit for calculating a logarithm of a number
A digital circuit computes the logarithm of a number. The circuit makes the computation by first determining a multiplicity of factors fi from a predetermined set of factors such that the product... 

5337266 
Method and apparatus for fast logarithmic addition and subtraction
An apparatus is provided for logarithmic subtraction that is suitable for general purpose computing using the sign logarithm number system. In the sign logarithm number system, a sign bit is... 

5301138 
Device and method for evaluating logarithms
A logarithm of an input value is computed utilizing a function generator to generate a first logarithm of an approximation value of the input value, scaled to a natural logarithm value where the... 

5197024 
Method and apparatus for exponential/logarithmic computation
A method and apparatus for use in or with a generalpurpose computing environment employs particularly efficient exponential and logarithmic function generation in combination with a logarithmic... 

5184317 
Method and apparatus for generating mathematical functions
A method and apparatus for generalpurpose generation of digital mathematical functions in connection with a computer processor enabling computation of such functions as exponential, logarithmic,... 

5097434 
Hybrid signeddigit/logarithmic number system processor
The combination of the signed digit (SD) and the logarithmic number system (LNS) for the creation of a hybrid SD/LNS processor. An optimal radix was chosen for the SD system by taking into account... 

4852038 
Logarithmic calculating apparatus
A calculating apparatus receives four operands ("a, b, c and d") simultaneously. A first multiplier/divider performs the calculation of a*b or a÷b and provides an output u. A second... 

4791403 
Log encoder/decorder system
A high speed form of finite precision binary arithmetic coding comprises encoding/decoding performed in the logarithm domain, resulting in facilitated computation based on additions and... 

4747067 
Apparatus and method for approximating the magnitude of a complex number
Vector magnitude approximating logic using logarithms of the vector's orthogonal components to select multiplier scaling constants and to minimize arithmeticfunction and hardware complexity. The... 

4737925 
Method and apparatus for minimizing a memory table for use with nonlinear monotonic arithmetic functions
A method which reduces the memory required to store correction factors used in logarithmic addition and subtraction of logarithmic operands. The method is implemented by a circuit which adds a... 

4734875 
Log mixer circuit
A logarithmic mixer circuit in the form of a conversion circuit for mixing digital representations of logarithmic values eliminating the usual mathematical processes of determining antilogs,... 