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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...
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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,...
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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...
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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...
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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...
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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...
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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,...
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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...
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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...
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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...
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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 data...
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6003058 |
Apparatus and methods for performing arithimetic operations on vectors and/or matrices
A multiply-multiply-accumulate (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)...
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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).
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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...
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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...
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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).
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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...
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5936871 |
Method and system for performing an L.sub.2 norm operation
A method and system for an L 2 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...
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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...
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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...
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5798957 |
LNS-based computer processor and method of use thereof
An LNS-based computer processor is provided for performing high-speed calculations that involve special function values. Special functions include transcendental and hyperbolic functions. The...
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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...
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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 second...
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5726924 |
Exponentiation circuit utilizing shift means and method of using same
A circuit and method for computing an exponential signal x g is provided. The circuit includes a logarithm converter which converts an input signal to binary word that represents the logarithm of...
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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...
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5703801 |
Logarithm/inverse-logarithm converter utilizing second-order term and method of using same
A converter which may be used for implementing either logarithmic or inverse-logarithmic functions is disclosed. The converter includes a memory, a multiplier, and two adders. The memory stores a...
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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, an...
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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)...
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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....
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5600581 |
Logarithm/inverse-logarithm converter utilizing linear interpolation and method of using same
A converter which may be used for implementing either logarithmic or inverse-logarithmic functions includes a memory, a multiplier, and an adder. The memory stores a plurality of pre-computed...
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5570310 |
Method and data processor for finding a logarithm of a number
A data processor and method are used to find log p (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...
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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...
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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 f i from a predetermined set of factors such that the product...
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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...
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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...
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5197024 |
Method and apparatus for exponential/logarithmic computation
A method and apparatus for use in or with a general-purpose computing environment employs particularly efficient exponential and logarithmic function generation in combination with a logarithmic...
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5184317 |
Method and apparatus for generating mathematical functions
A method and apparatus for general-purpose generation of digital mathematical functions in connection with a computer processor enabling computation of such functions as exponential, logarithmic,...
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5097434 |
Hybrid signed-digit/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...
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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...
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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...
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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 arithmetic-function and hardware complexity. The...
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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...
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4734876 |
Circuit for selecting one of a plurality of exponential values to a predetermined base to provide a maximum value
A circuit for receiving a plurality of signed operands which each represent an exponential value to a predetermined base and for selecting one of the operands which results in a maximum value is...
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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 anti-logs,...
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4727508 |
Circuit for adding and/or subtracting numbers in logarithmic representation
In a digital signal processing system, a logarithmic arithmetic logic unit which selectively performs multiply/accumulate operations of operands in logarithmic number representation. Direct feed...
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4720809 |
Hybrid floating point/logarithmic number system arithmetic processor
A hybrid arithmetic processor which combines attributes of conventional floating point (F.P) arithmetic with logarithmic number system (LNS) arithmetic. The arithmetic processor includes an input...
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4682302 |
Logarithmic arithmetic logic unit
In a digital signal processing system, a logarithmic arithmetic logic unit is provided which selectively performs multiply/accumulate operations of operands in logarithmic number representation....
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4626825 |
Logarithmic conversion apparatus
A logarithmic converting apparatus for converting a digital binary integer into logarithmic representation and for converting logarithmic representation into digital binary integer is disclosed....
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4583180 |
Floating point/logarithmic conversion system
A digital transformation system for converting between logarithm functions and floating point functions very quickly by normalizing the floating point number in the range of one to two, and...
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4555768 |
Digital signal processing system employing logarithms to multiply and divide
A digital signal processing system applies numbers to the multiplied or divided to address a memory storing a logarithm table to produce the logarithms of the numbers. These logarithms are added...
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