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| Number | Title | Issue Date |
| 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 unit, and an output computing unit. The method includes the steps of: rec... | 11/10/2009 |
| 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 lookup table that is capable of providing a high order part and a low ... | 06/02/2009 |
| 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 shift register to synthesize a frequency. After digital-to-analog conve... | 07/01/2008 |
| 7350176 | Techniques for mapping to a shared lookup table mask Techniques for combining lookup tables on a programmable integrated circuit are provided. Lookup tables (LUTS) in a design for a programmable circuit can be combined into one mask if they implement the same function. Any two LUTs in a design can be compared to deter... | 03/25/2008 |
| 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 waveform such that a pulse output signal is produced from the lookup table... | 10/16/2007 |
| 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 desired output signal. A time measurement circuit determines a time int... | 10/09/2007 |
| 7276655 | Music synthesis system The invention relates to a music synthesis system for synthesizing a corresponding digital music output according to commands from a music data file. The music data file comprises a plurality of music data units. Each music data unit records related information of t... | 10/02/2007 |
| 7209937 | Method and apparatus for generation of arbitrary mono-cycle waveforms A waveform generator digitally synthesizes a waveform having a plurality of successive portions that can each be as short as one mono-cycle of the waveform, or a part of one mono-cycle. The waveform generator changes at least one of a frequency, a phase and an ampli... | 04/24/2007 |
| 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 plurality of data segments for determining a predetermined period of one s... | 03/20/2007 |
| 7164735 | Phase-locked loop for synchronization with a subcarrier contained in an intelligence signal A phase-locked loop locks relatively quickly to a pilot tone of the stereo-multiplex signal when a new transmitter is tuned in. The stereo-multiplex signal may be multiplied in a multiplier by the quadrature component of the pilot tone generated by a digital oscilla... | 01/16/2007 |
| 7155362 | Test device for signaling and waveform generation and monitoring A system for generating a signal for testing a relay is provided. The system includes a plurality of argument vector arrays, each defines a digital signal for testing the relay. Each of the argument vector arrays includes a plurality of argument vectors and each arg... | 12/26/2006 |
| 7127631 | Single wire serial interface utilizing count of encoded clock pulses with reset A single wire serial interface for power ICs and other devices is provided. To use the interface, a device is configured to include an EN/SET input pin. A counter within the device counts clock pulses sent to the EN/SET input pin. The output of the counter is passed... | 10/24/2006 |
| 7120204 | Waveform generator operable in accordance with a plurality of band limitation characteristics A waveform generator comprises waveform generating means for generating a waveform signal band-limited using a first band limitation characteristic in accordance with the input signal series, memory means for storing in advance a difference signal between a waveform... | 10/10/2006 |
| 7111028 | Data conversion method, a data conversion circuit and a data conversion program A method of the data conversion, a data conversion circuit and a data conversion program are provided which make the memory capacity of the circuit for storing the converted data small and can make the error of the output data small. To comprise a priority encoder | 09/19/2006 |
| 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 table method comprises: data storing that storing the input data int... | 08/01/2006 |
| 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 high end point and a predecessor low end point, receiving an array of ... | 07/18/2006 |
| 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 complex arithmetic operations. In this way, at the expense of a few LUTs, ... | 06/06/2006 |
| 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 generates a waveform output that is amplified by a power amplifier b... | 05/23/2006 |
| 7031993 | Method and apparatus for fast natural log(X) calculation A method for computing a natural logarithm function includes partitioning a mantissa region between 1 and 2 into N equally spaced sub-regions; precomputing a reference point ai of each of the N equally spaced sub-regions, where i=0, . . . ,N−1; selectin... | 04/18/2006 |
| 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 polynomial. With this simplified representation, an output value of a f... | 12/13/2005 |
| 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 by the memory, and a selection unit coupled to each of the waveform s... | 10/18/2005 |
| 6938062 | 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 lookup table that is capable of providing a high order part and a low ... | 08/30/2005 |
| 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 apparatus includes a means for storing seed values corresponding to seed... | 08/16/2005 |
| 6928027 | Virtual dual-port synchronous RAM architecture Disclosed is a virtual dual-port synchronous RAM device, system, and method, wherein the design requires minimal hardware cost compared with a dual-port RAM architecture or the traditional architecture used with a single-port RAM. Disclosed is a read/write memory de... | 08/09/2005 |
| 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 signal, and a counter for counting by a predetermined fixed ... | 03/25/2003 |
| 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 one-fourth of a period of a periodic function is stored, and ... | 02/11/2003 |
| 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 data inputs and n is an integer greater than one. Each pair o... | 04/23/2002 |
| 6271682 | Method and apparatus for high-speed edge-programmable timing signal generator A method and apparatus for generating a timing signal for a semiconductor device, wherein the timing of rising and falling edges in the timing signal can be very precisely controlled. In one embodiment, a serial data stream derived from data stored in a m... | 08/07/2001 |
| 6173301 | Method of generating signal amplitude responsive to desired function, and converter The invention relates to a method for generating a signal amplitude behaving according to a desired function and to a converter implementing the method. In the method, a function that is used for controlling the behaviour of a signal amplitude is piecewis... | 01/09/2001 |
| 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 state (an NRZ waveform). A waveform input section reads out ... | 12/12/2000 |
| 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 display based on data for displaying the graph inputted f... | 08/15/2000 |
| 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 bit of the multibit designation to produce an address sig... | 08/10/1999 |
| 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 directly store a complex signal, rendering the use of a r... | 07/27/1999 |
| 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 frequencies are increased according to this invention by incl... | 04/06/1999 |
| 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 table of digital samples for converting the digital sawtoo... | 01/26/1999 |
| 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 points per cycle is generated as a combination of P independe... | 08/25/1998 |
| 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 digital frequency synthesizer produces phase information ... | 01/28/1997 |
| 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 sample data of a regenerated waveform having a desired pitch ... | 09/03/1996 |
| 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 an output from the floating point adder, an address decode... | 04/09/1996 |
| 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) 121 to store wave formation information on waveform is pro... | 05/23/1995 |
