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7617266 Nonlinear conversion system using precision mapping and the method thereof  
A nonlinear conversion system using precision mapping and the method thereof are described. The system includes a source value converter, a mapping table unit, a recovering parameter computing...
7543008 Apparatus and method for providing higher radix redundant digit lookup tables for recoding and compressing function values  
An apparatus and method are disclosed for providing higher radix redundant digit lookup tables for digital lookup table circuits. A compressed direct lookup table unit accesses a redundant digits...
7509363 Method and system for approximating sine and cosine functions  
A technique for approximating output values of a function based on LaGrange polynomials is provided. Factorization of a LaGrange polynomial results in a simplified representation of the LaGrange...
7506014 Tunable multi-phase-offset direct digital synthesizer  
A plasma control system including a direct digital synthesizer (DDS) for generating more than one individual RF power signal, where the individual RF power signals are combined to define a combined...
7395289 Frequency synthesizing and back-end processing circuit and method thereof  
A frequency synthesizing and back-end processing circuit and method thereof are provided. This circuit includes a fully digital frequency synthesizer by using interpolation and a linear feedback...
7284025 DDS pulse generator architecture  
A DDS pulse generator has an accumulator that accumulates a phase increment value to produce phase accumulator values, and has a lookup table that contains a digital representation of a pulse...
7281025 Triggered DDS pulse generator architecture  
A triggered DDS generator architecture accumulates a phase increment value in response to a DDS clock to generate phase accumulator values for addressing a waveform lookup table which contains a...
7193449 Method and apparatus for generating multi-phase signal  
A multi-phase signal generating apparatus is provided for readily generating multiple phase signals. The multi-phase signal generating apparatus comprises a signal data storage which stores a...
7085792 Look-up table methods for reducing the use of memory volume and system thereof  
The present invention relates to a look up table method for reducing the use of memory and more particularly to a condition while the input value has higher bits than the output value. This look up...
7079143 Waveform drawing system and method  
A waveform drawing routine is disclosed that includes receiving an array of predecessor image data points, wherein the predecessor image data points form a predecessor line that has a predecessor...
7058675 Apparatus and method for implementing efficient arithmetic circuits in programmable logic devices  
Efficient implementation of arithmetic circuits in programmable logic devices by using Look-Up Tables (LUTs) to store pre-calculated values. A table look-up operation is performed in place of...
6976043 Technique for approximating functions based on lagrange polynomials  
A technique for approximating output values of a function based on LaGrange polynomials is provided. Factorization of a LaGrange polynomial results in a simplified representation of the LaGrange...
6957239 System and method for generating waveforms using waveform segment queues  
A system for generating waveforms may include a memory configured to store a plurality of waveform segments, a plurality of waveform segment queues each coupled to receive waveform segments output...
6931426 Apparatus and method for detecting operation value using lookup-table  
An apparatus and method for detecting an operation value using a look-up table at high speed, which not only minimizes the size of the look-up table but also satisfies a desired error rate. The...
6539411 Direct digital synthesizer  
A digital synthesizer includes a memory containing values representing amplitudes of a signal such as a sinewave, a digital/analog converter for converting outputs from the memory into an analog...
6519619 Circuit for generating periodic function  
A circuit for digitally generating a series of encoded sampling values of a periodic function by virtue of ROM table conversion, include (a) a function ROM in which an amplitude associated with...
6377079 Data serializer with slew-rate control  
A data serializer includes a differential output stage. The differential output stage has n pairs of first and second control inputs, wherein each pair of control inputs corresponds to one of n...
6173301 Method of generating signal amplitude responsive to desired function, and converter  
6161117 Waveform generation device and method  
A waveform pattern file storage section is used for specifying a waveform pattern of a control signal, and storing waveform pattern bit strings formed from bits each of which specifies 1 logical...
6104411 Electronic computing apparatus having graph displaying function and method for displaying graph  
There are provided an electronic computing apparatus having a graph displaying function and a graph displaying method which allow an optimum graph to be quickly displayed. A graph is displayed on a...
5937438 Sine/cosine lookup table  
A lookup table includes a complementer, a memory and a switching element. The complementer selectively complements a subset of bits of a multibit designation of an angle based on a most significant...
5929635 Digital oscillator and supply circuit for an eddy current probe  
The present invention relates to a digital oscillator comprising an oscillator (40), a counter (41), a memory (42), a digital-analog converter (43) and a low-pass filter (44). The memory is able to...
5892692 Method for generating a lookup table for a digital oscillator  
A digital waveform oscillator generates digitized waveforms without distortion using a lookup table. The frequencies which may be generated using direct lookup tables at their fundamental table...
5864492 Randomized digital waveshape samples from a look up table  
A digital synthesizer for producing a digital frequency signal includes a phase accumulator for repeatedly accumulating a phase value to generate samples of a digital sawtooth signal and a look-up...
5799265 Apparatus and method for generating a sinusoidal signal  
The present invention pertains to a method and system for generating a sinusoidal signal as a combination of independently generated sinusoidal signals. A sinusoidal signal consisting of M data...
5598437 Multichannel frequency and phase variable radio frequency simulator  
A multichannel frequency phase variable signal source is described having particular application in the simulation of an emitter environment for testing interferometer receivers. An improved direct...
5553011 Waveform generating apparatus for musical instrument  
A waveform generating apparatus for generating waveforms which can be suitably employed in electronic musical instruments. The waveform generating apparatus calculates and generates regenerated...
5506797 Nonlinear function generator having efficient nonlinear conversion table and format converter  
An input value x of floating-point representation is added up with an input value offset by a floating point adder, to be translated to a region where an exponent part is constant. On the basis of...
5418734 Finely adjustable signal wave forming circuit including complementary clock signal counters  
A variable wave forming circuit is provided which produces signals of various waveforms (e.g., sine, triangular or trapezoidal waves) and various frequencies. A random access memory (memory means)...
5258937 Arbitrary waveform generator  
An arbitrary waveform generator is capable of producing pulse or continuous aveform signals. It utilizes an EPROM that sends out selected stored digital signals under control of a microprocessor...
5220523 Wave form signal generating apparatus  
In a wave form signal generating apparatus designed to memorize a desired wave form in the form of a floating point representation for generating a wave form signal based on the memorized wave...
5185710 Quaternary-level waveform generator  
A quaternary-level waveform generator in which a modulation wave prior to a band restriction (a quaternary-level square wave sequence) is separated into two binary-level square wave sequences and...
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,...
5181182 Multi-level band-restricted waveform generator  
A multi-level band-restricted waveform generator in which a modulation wave prior to band restriction (M-level signal sequence) is broken into elementary waveforms and a plurality (N-nary) of...
5140540 Delay equalization emulation for high speed phase modulated direct digital synthesis  
In a pipelined direct digital synthesis system (FIG. 3), new increment data (124) and/or phase modulation data (122) are input delay equalized by providing the data to a series of switch blocks...
5054039 Digital calibration circuit employing composite sine wave signals  
A digital calibration circuit provides 1/3 octave center frequencies substially in the range of 50 Hz-12.5 kHz (25 tones) simultaneously at the output at repeatable levels. The system converts...
5029120 Electrical wavefrom generator means and methods  
An electrical waveform generator and a method for electrical waveform generation are provided which includes a central processing unit (13) to first provide sequential points of a selectable...
5014231 Randomized digital/analog converter direct digital synthesizer  
A sine output or phase interpolation direct digital synthesizer for use in satellite programs having a random or pseudorandom code generator for summing a random digital word whose value ranges...
5001660 Waveform generation method using stored complex data  
A digital mixer is supplied with two digitized input signals in complex form. The product of the complex input signals is converted to analog form and provides the desired output signal without any...
4992743 Dual-tone direct digital synthesizer  
Arrangements are provided for generation of dual-tone waveforms utilizing direct digital waveform synthesis techniques and architecture and retaining the advantageous characteristics of direct...
4956798 Arbitrary waveform generator with adjustable spacing  
An arbitrary waveform generator using packet data words to represent segments of a desired complex waveform includes a variable clock. Each packet data word contains a clock control word that is...
4881190 Digitally programmable signal generator and method  
A digitally programmable waveform generator for generating completely arbitrary digital or analog waveforms from very low frequencies to frequencies in the gigasample per second range. A memory...
4878194 Digital signal processing apparatus  
A digital signal processing apparatus includes an A/D converter for converting an analog input signal to digital data, a memory having a plurality of memory blocks for storing the digital data, and...
4809577 Apparatus for generating tones by use of a waveform memory  
A tone generating apparatus comprises at least an address generator, a waveform memory and a sound system. The waveform memory provides a plurality of storing areas each of which stores word data...
4791384 Programmable function controller for use in a waveform generator system  
The programmable function controller herein may be used in conjunction with a data processor and a waveform storage memory together with digital-to-analog conversion means for providing an analog...
4713788 Burst signal generator  
A set value of a frequency setting register is accumulated upon each occurrence of a clock signal, and a waveform memory is read out by using the accumulated value as an address. In the waveform...
4701872 Aperiodic waveform generation using stored markers identifying scaled waveform sections  
In an apparatus for generating an aperiodic waveform having a gradually decaying envelope, a sequence of digital samples representing the magnitude of the waveform at sample points is stored in a...
4701871 Signal generator using digital memory  
The present invention comprises a signal generator which uses digital memory for generating a digital signal which has a value which periodically varies with a memory having 2 n addresses in each...
4692886 Digital pattern generator  
A digital pattern generator generates various kinds of digital pattern signals. A first memory stores an execution signal, an area control signal and a digital pattern. A program counter generates...
4683795 Periodic wave form generation by recyclically reading amplitude and frequency equalized digital signals  
An electronic musical instrument includes a memory in which digital samples of an aperiodic waveform are stored. Digital samples stored in a first portion of the memory represent a rapidly rising...
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