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7610323 Method and apparatus for initializing interval computations through subdomain sampling  
One embodiment of the present invention provides a system that uses a computer to evaluate a function within a domain using an interval computing technique. During operation, the system receives...
7592835 Co-processor having configurable logic blocks  
A co-processor system is provided that includes an array of configurable logic blocks (CLBs). Each CLB including a plurality of look-up tables and a plurality of adders. Each CLB may be dynamically...
7562105 Methods and apparatus for generating a delay using a counter  
Methods, apparatus, and articles of manufacture for generating a delay time using a counter are disclosed. In particular, the methods, apparatus, and articles of manufacture determine a number of...
7555508 Methods and apparatus for performing calculations using reduced-width data  
Methods, apparatus, and articles of manufacture for performing calculations using reduced-width data are disclosed. In particular, an example method determines reduced-width data values associated...
7528745 Digital domain sampling rate converter  
Techniques are described for sampling rate conversion in the digital domain by up-sampling and down-sampling a digital signal according to a selected intermediate sampling frequency. A prototype...
7509362 Non-linear function approximation using finite order polynomial in fixed-point arithmetic  
A system, method, and apparatus for calculating non-linear functions with finite order polynomials are presented herein. Use of finite order polynomials allow calculation of the non-linear...
7508936 Hardware accelerator for elliptic curve cryptography  
An elliptic curve processing apparatus that performs operations on elliptic curves specified over binary polynomial fields includes a functional unit that has a digit serial multiplier with a digit...
7472149 Arithmetic unit for approximating function  
A look-up table outputs an initial value, an inclination of a straight line and a correction value in response to an entry-of a high-order bit string of an operand. An offset circuit calculates an...
7409416 Digital-to-time converter using cycle selection windowing  
A signal generator consistent with certain embodiments of the invention has a reference clock ( 34 ) producing a periodic sequence of reference clock output pulses. A window generator ( 38 )...
7395286 Method for generating non-overlapping N-phases of divide-by-N clocks with precise 1/N duty ratio using a shift register  
A divide-by-N clock frequency divider producing N non-overlapping clocks each with precise 1/N duty ratio is implemented by a counter, a token generator and N-bit shift register. Every N clock...
7366745 High-speed function approximation  
Methods and apparatuses are presented for determining coefficients for a polynomial-based approximation of a function, by iteratively estimating a first coefficient, reducing the first coefficient...
7328229 Clock divider with glitch free dynamic divide-by change  
The circuit of this invention performs clock division with dynamic divide-by value change capability. This circuit provides low area and low latency. The clock divider is conventional except for...
7325022 Methods and apparatus for determining approximating polynomials using instruction-embedded coefficients  
Methods and apparatus for determining approximating polynomials using instruction-embedded coefficients are disclosed. In particular, the methods and apparatus use a plurality of coefficient values...
7321630 Approximation method for series expansion of input function and system using the same  
An approximation method and system for series expansion of functions include the steps and functions, respectively, of: expanding an input function in Taylor series up to an (N−1)-th term;...
7290020 Electronic device to calculate and generate linear and non-linear functions  
Electronic device ( 10 ) to calculate linear functions and to calculate and generate non-linear functions, intended to process signals. The electronic device ( 10 ) is provided with a calculator...
7277906 Method for determining an output value having a lowest error value from an input value  
The present invention teaches a method for generating an output value corresponding to an input value via a first function comprising a first section and a second section with the use of a lookup...
7251734 Secure integrated circuit including parts having a confidential nature and method for operating the same  
The secure integrated circuit ( 1 ) further includes storage means ( 2 ) in which confidential data is stored, such as an encryption programme and at least an encryption key, and a microprocessor...
7154431 Signal synthesizer and method therefor  
A digital synthesizer includes a digital radio frequency memory (DRFM) for storing phase values and corresponding digital signals. The digital synthesizer includes a digital processing circuit...
7142675 Sequence generator and method of generating a pseudo random sequence  
A sequence generator for generating a pseudo random sequence for random number generation or a stream cipher engine includes a plurality of linear feedback shift registers operable to generate a...
7117234 Waveform generator for use in IQ modulation  
A waveform generator for use in IQ modulation in a wireless cellular device having an FM waveform generator ( 104 ) that is programmable to generate a desired FM frequency deviation; a digital...
7084676 Method and apparatus for fractional RF signal synthesis  
The present invention provides a method to improve the frequency resolution and phase noise of a synthesized RF signal. It also results in the superior characteristics of instantaneous frequency...
7069283 Method and circuit for calculating multiple of unit value and generating a periodic function  
In order to generate a multiple of a unit U, N times U, by a digital circuit is provided, where U is a rational number and N is a natural number, the method comprises the following steps (1) to...
7050000 Radar based application programmable waveform generator component  
An exemplary radar system includes a waveform generator that generates a control waveform. An in-phase and quadrature modulator receives the control waveform from the waveform generator and in turn...
7023378 Self-calibrating wideband phase continuous synthesizer and associated methods  
The synthesizer and method provide a relatively wideband swept frequency signal and include generating a first swept frequency signal with a first generator, and successively switching between...
7007052 Efficient real-time computation  
Systems and methods for determining coefficients a filter are disclosed. The filter coefficients are computed by determining a sine of an input value and an inverse of the input value. The sine of...
6981011 Precision complex sinusoid generation using limited processing  
A first value of a sinusoidal-shaped electronic signal is computed based on a Lagrange interpolation using an update phase-angle associated with the electronic signal, a first set of equally-spaced...
6978289 Apparatus and method for minimizing accumulated rounding errors in coefficient values in a lookup table for interpolating polynomials  
An apparatus and method are disclosed for minimizing accumulated rounding errors in coefficient values in a lookup table for interpolating polynomials. Unlike prior art methods that individually...
6944639 Hardware context vector generator for JPEG2000 block-coding  
A hardware context vector codec/generator which can be used in the block coder of a discrete wavelet transform (DWT) codec. The context vector codec/generator consists mostly of three columns of...
6941330 Feed forward sigma delta interpolator for use in a fractional-N synthesizer  
A sigma delta interpolator for use in a fractional N synthesizer having a multi-modulus divider for controlling the output frequency of the synthesizer. The sigma delta interpolator includes an...
6934731 Rational frequency synthesizers employing digital commutators  
A method and an apparatus are disclosed for digital synthesis of signals having a frequency which is a rational factor n/m times an existing reference or clock frequency, wherein n and m may be...
6850960 Inverse calculation apparatus and recording medium having stored thereon a program for executing inverse calculation  
In an inverse calculation, x is road out of a storage means, [x/2] is calculated and stored therein as b, a lent significant bit of b is stored as a, [(ax+b)/2] is calculated and stored as updated...
6807554 Method, system and computer program product for digitally generating a function  
A method, system and computer program product for digitally generating a function, including a phase accumulator configured to receive a phase value and integrate the phase value to generate an...
6748407 Direct digital synthesizer  
A direct digital synthesizer that suppresses phase jumps which would invite the generation of spurious signals. Out of phase data supplied by a phase accumulator, the value of any rounding error...
6735607 Transparent data access and interpolation apparatus and method therefor  
An apparatus ( 20 ) and method ( 22 ) for transparently accessing and interpolating data are provided. Consecutive data values ( 24 ) of a function are generated and indexed. Even-indexed data...
6732128 Reduction of periodic signals in pseudo-random noise produced with direct digital synthesis  
A DDS (Direct Digital Synthesis) frequency synthesizer can be adapted to operate as a pseudo random noise generator by including a swept address ingredient that distributes (but does not eliminate)...
6711509 Impulsive transient hardware simulation  
An on-board self test system for an electrical power monitoring device includes a test signal circuit in an electronic circuit of the monitoring device, and responsive to a programmable test input...
6697830 Polynomial coefficient generator  
A polynomial coefficient generator for performing a polynomial multiplication. All the sub-coefficients necessary for performing the polynomial multiplication can be sequentially input into the...
6697538 Apparatus for producing a flattening map of a digitized image for conformally mapping onto a surface and associated method  
A computerized apparatus and associated method and program code on a storage medium, for producing a flattening map of a digitized image. This image may be initially synthetically produced as...
6665693 Digital signal processing circuits, systems, and methods implementing approximations for a reciprocal  
A digital signal system ( 10, 100 ) for determining an approximate reciprocal of a value of x. The system includes an input ( 12 ) for receiving a signal, and circuitry ( 18 ) for measuring an...
6664819 Frequency synthesizer for improving a unique DDS characteristic  
A frequency synthesizer that improves a unique DDS characteristic, while maintaining a circuit scale (ROM size) of a direct digital synthesizer (DDS). A first digital signal generator generates a...
6611854 System and method for distorting a signal  
The present invention employs a mapping function in order to apply a known distortion to an input signal. The mapping function of the present invention is defined by:...
6587863 Multiphase, interleaved direct digital synthesis methods and structures  
Direct digital synthesis (DDS) methods and structures are provided that increase DDS output frequencies f out without requiring a corresponding increase in the rate f clk at which DDS structures...
6581079 Apparatus for computing transcendental functions quickly  
The invention provides a method and system for computing transcendental functions quickly: (1) the multiply ALU is enhanced to add a term to the product, (2) rounding operations for intermediate...
6578057 Method of and apparatus for deriving prime numbers, as well as record medium having program for executing prime number deriving method recorded thereon  
On the basis of a high degree of theory, prime numbers are derived through effective processing and steps so as to achieve a remarkable reduction in the processing time taken for the derivation....
6549924 Function generating interpolation method and apparatus  
An input number is applied to a look-up table that supplies three coefficients based upon certain bits of the input that define a series of bins. The first coefficient is fed directly to an adder...
6424185 NCO based frequency synthesizer with jitter modulation  
An improved synchronization circuit has a numerically controlled oscillator (NCO) having an accumulator, a number line, and feedback line fed back from the accumulator output. The accumulator...
6393449 Arbitrary function generator  
An arbitrary function generator produces one or more waveforms for arbitrary applications wherein a general-purpose waveform production capability is customized to meet the demands of specific...
6385632 Fast CORDIC algorithm with sine governed termination  
A system and method for evaluating one or more functions using a succession of CORDIC stages/iterations followed by a residual rotation. The succession of CORDIC stages are preferably partitioned...
6330578 Method and apparatus for digitally representing a waveform  
A method and apparatus for digitally representing a waveform segment defined by discrete ordered pairs of abscissae and ordinates, the ordered pairs being divided into an odd set and an even set....
6320431 Apparatus and method of generating numerically controlled oscillator signals  
An apparatus according to a preferred embodiment of the present invention includes two memories each storing different octants of a sine (or cosine) waveform. The sine and cosine waveforms may be...
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