Quotables
"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 8125363 | Digital signal processing device There is provided a digital signal processing device capable of suppressing occurrence of an unnecessary frequency component (spurious) in performing a reduction processing of a bit number of a frequency signal made of a digital signal. A signal output section 10... | 02/28/2012 |
| 7760119 | Waveform generator and test apparatus The purpose is to provide a waveform generator that generates signals with a frequency lower than the minimum sampling frequency of the DAC. In the waveform generator 10, the clock generator 106 generates a clock signal 140. The frequency... | 07/20/2010 |
| 7705759 | Generation of a digital controlled precise analog sine function Disclosed are techniques for generating a precisely controlled analog signal. In one described implementation, a semiconductor circuit is mounted on a circuit board having a power and a ground etching. The circuit has a power terminal coupled with the power etching ... | 04/27/2010 |
| 7642942 | Systems and methods for synthesis of a signal Systems and methods synthesize a signal from the odd harmonic frequency components of an input signal. An exemplary embodiment synthesizes a first signal with a digital to analog converter (DAC), generates a second signal from the first signal, and filters a selecte... | 01/05/2010 |
| 7436725 | Data generator having stable duration from trigger arrival to data output start A data generator has stable duration from trigger arrival to substantial data output start. A memory provides parallel data according to a divided clock. An address counter provides the same address to the memory until a trigger signal arrives and starts increasing ... | 10/14/2008 |
| 7391842 | Direct synthesis clock generation circuits and methods Clock signal generation circuitry includes input circuitry for receiving a frequency control input signal and a clock signal and generating a memory address therefrom, a memory for storing digital data indexed by the memory address and representing real and imaginar... | 06/24/2008 |
| 7379006 | Digital to analog converter calculating a difference between multiple indicators of a multi-bit input signal The present invention relates to multi-bit to pulse width modulated signal conversion, with extensions to digital-to-analog conversion. In particular, it has application to conversion of pulse code modulated signals, such as used in CDs and DVDs, to audio output. | 05/27/2008 |
| 7345610 | High speed digital-to-analog converter A digital-to-analog converter supporting high speed operation is defined. The converter includes a plurality of sampler circuits in electrical communication with a digital signal source and a summation circuit in electrical communication with the plurality of sample... | 03/18/2008 |
| 7342521 | System and method for multi-channel delay cell based clock and data recovery Systems and methods regarding the restoration of serialized data to parallel data with a low speed reference signal are provided. In exemplary embodiments, a phased lock loop receives a reference clock signal from a data source and generates a reference high speed c... | 03/11/2008 |
| 7321327 | Data converters for programmable logic Digital-to-analog and analog-to-digital conversion are implemented in or using programmable logic. The DAC and ADC circuits may be hardwired in a programmable logic integrated circuit or may be implemented using an intellectual property (IP) core. The IP core would ... | 01/22/2008 |
| 7317413 | Multi-channel digital to analog (D/A) conversion A multi-channel digital-to-analog (D/A) conversion system that can produce an analog output (210) from a digital signal (201) using N D/A converters (C1-CN), each with 1/N of the resolution of a single D/A converter used to perform the same D/A ... | 01/08/2008 |
| 7302237 | Wideband signal generators, measurement devices, methods of signal generation, and methods of signal analysis A wideband signal generator according to one embodiment of the invention includes a variable frequency source and a direct digital synthesizer. Local oscillators, signal analyzers, modulators, demodulators, and other equipment including one or more such generators a... | 11/27/2007 |
| 7293851 | Liquid discharging head drive device and drive method A drive device drives a liquid discharging head to discharge, in accompaniment with the application of a drive signal voltage to a drive element, recording droplets from a nozzle disposed with the drive element. The drive device includes: a fundamental waveform data... | 11/13/2007 |
| 7286070 | RF carrier generator and method thereof An RF carrier generator comprises a circuit for sequentially counting as a function of a randomized offset and time interval, and a memory coupled to the sequential counting circuit. The memory stores samples of a desired Sigma-Delta modulator sequence bit stream. R... | 10/23/2007 |
| 7259705 | Tracking supply AC regeneration system and method A circuit for implementing tracking supply alternating current (“AC”) regeneration is described. In one embodiment, the circuit comprises a line synchronization device for converting an incoming AC signal to a square wave, wherein the square wave is precisely in... | 08/21/2007 |
| 7253760 | Method for adjusting signal generator and signal generator Monitoring a spectrum of an inter-leaved signal by a signal generator which inter-leaves two DAC outputs with the same sampling rate, while adjusting the output offset level of each DAC, the output amplitude level of each DAC, the output selection timing of each DAC... | 08/07/2007 |
| 7248658 | Method and circuit for deriving a second clock signal from a first clock signal A clock generation circuit for a dual system radio frequency station is provided. The station includes a digital synthesis circuit clocked by a first clock signal for a first RF system that is adapted to generate a base signal output of a predetermined frequency. A ... | 07/24/2007 |
| 7193551 | Reference voltage generator for use in display applications A multi-reference voltage generator includes an interface controller, a first bank of N m-bit registers and a second bank of N m-bit registers. A first multiplexer has inputs connected to outputs of the first and second bank of registers. An m-bit digital-to-analog ... | 03/20/2007 |
| 7190908 | Optical differential quadrature phase-shift keyed decoder A differential quadrature phase shift keyed system includes a fiber optic source and a first fiber optic differential phase shift keyed demodulator coupled to the fiber optic source having a first phase differential. A second fiber optic differential phase shift key... | 03/13/2007 |
| 7171168 | Ramp signal with boost portion preceding a time slot A transmitter includes a power amplifier which is capable of both linear and non-linear operation, controlled by first and second control loops. A power controller includes a capacitive component, and controls the gain of the power amplifier. A ramp generation circu... | 01/30/2007 |
| 7165445 | Digital control of quality factor in resonant systems including cantilever based instruments A digital system for controlling the quality factor in a resonant device. The resonant device can be any mechanically driven resonant device, but more particularly can be a device that includes a cantilever within its system, such as an atomic force microscope. The ... | 01/23/2007 |
| 7136003 | Clockless pulse shaping circuit for controlling a power amplified output According to an exemplary embodiment, a circuit includes a power amplifier configured to generate an RF output signal. The circuit further includes a pulse shaping circuit coupled to the power amplifier, where the pulse shaping circuit is configured to receive a dig... | 11/14/2006 |
| 7130327 | Digital frequency synthesis Frequency synthesis is implemented by providing a delta-sigma modulated signal associated with a selected frequency, which frequency can vary based on a selection input. The delta-sigma modulated signal is converted from the digital to analog domain. The delta-sigma... | 10/31/2006 |
| 7126520 | Segmented sawtooth generator Generation of segmented sawtooth waveforms. A desired waveform is divided into intervals. A slope is associated with each interval. A charge current representing the slope is applied to a timing capacitor during each interval. Responsive to a clock signal, a counter... | 10/24/2006 |
| 7095349 | Numerically controlled oscillator and method for operating the same A numerically controlled oscillator (NCO) is defined to include counter circuitry and integrator circuitry. The counter circuitry includes a first input for receiving a minimum count value, a second input for receiving a maximum count value, and a third input for re... | 08/22/2006 |
| 7092476 | Direct synthesis clock generation circuits and methods A clock generator includes input circuitry for receiving an input signal and generating a memory address therefrom. A memory stores digital data indexed by the memory address which represents at least a portion of an analog clock. A digital to analog converter conve... | 08/15/2006 |
| 7093151 | Circuit and method for providing a precise clock for data communications An apparatus comprising a circuit configured to (i) generate an output having a frequency and (ii) adjust the frequency in response to a measured duration of a known time interval associated with an input data stream. ... | 08/15/2006 |
| 7088274 | Difference amplifier for digital-to-analog converter An improved circuit is provided that buffers the output of a DAC while improving the bandwidth and linearity of the circuit. A DAC comprises an output signal of a switched DAC circuit coupled to an inverting node of an output buffer configured as a difference amplif... | 08/08/2006 |
| 7062357 | Multiple region convolver with tapering A multiple region convolver includes tapering between successive models of a physical system. The tapering is performed during a transition period. ... | 06/13/2006 |
| 7058371 | Mechanism for modulating wireless communication signals A modulating mechanism is provided comprising a first storage and a corresponding first DAC, and a second storage and a corresponding second DAC. The first storage stores an adjusted digital representation of a first waveform, while the second storage stores an adju... | 06/06/2006 |
| 7057543 | Low power method and interface for generating analog waveforms A low power analog output circuit is disclosed that utilizes a low pass filter driven by a bit stream to render a waveshaped output signal based upon a raw digital data signal. The analog output circuit includes sequential bit pattern selection logic that receives a... | 06/06/2006 |
| 7026846 | Synthesizer structures and methods that reduce spurious signals Synthesizers are provided to generate synthesizer signals in response to primary digital signal representations that are created by a signal generator. In an important feature, the synthesizers further include a signal corrector that inserts correction digital signa... | 04/11/2006 |
| 6946920 | Circuit for locking an oscillator to a data stream An apparatus comprising a control circuit and a first circuit. The first circuit may be configured to generate a calibration signal in response to an adjustment signal and a first control signal. The control circuit may be configured to generate (i) the first contro... | 09/20/2005 |
| 6890046 | Driving waveform generator and method of generating driving waveform The present invention provides a technique that prevents a shift of a driving waveform due to accumulation of errors in a process of generating the driving waveform to drive driving elements on a print head. The technique of the present invention successively sums u... | 05/10/2005 |
| 6867625 | Method and apparatus for high frequency digital carrier synthesis from plural intermediate carrier waveforms A signal synthesizer according to the present invention produces a high speed or high frequency carrier waveform without employing an ASIC or FPGA operating at a sampling rate of greater than twice the carrier frequency. The signal synthesizer basically simulates a ... | 03/15/2005 |
| 6763407 | Digital-to-analog converter with plural voltage holding sections, plural step function generators, voltage summing section and integrator A digital-to-analog converter for generating output waveforms with less distortion without the need for high-speed components. The digital-to-analog converter comprises a D/A converter, four voltage holding sections, four step function waveform generators, a voltage... | 07/13/2004 |
| 6657573 | Phase to sine amplitude conversion system and method A phase-to-sinusoid-amplitude conversion system and method for use in, for example, direct digital frequency synthesizer applications. The system and method convert phase data to signal amplitude data using an approximation of the first quadrant of a sine... | 12/02/2003 |
| 6653963 | Method and apparatus for the A/D conversion of analog signals and corresponding A/D converter arrangement An A/D converter arrangement comprises an A/D converter (6) to which analog signals from a plurality of signal channels (2) can be fed for A/D conversion. With the help of an appropriate control means (8), converter parameters of the A/D converter (6) or ... | 11/25/2003 |
| 6639535 | Digital to analog converter using B spline function A digital-analog converter for producing less distorted output waveforms without the need for an increase in the operating speed of components. A D/A converter 1 comprises a memory 10, an address counter 12, a B spline function generation circuit 14, four... | 10/28/2003 |
| 6549157 | Digital-to-analog converting device and method used in home networking system with compensation mechanism to reduce clock jitter A digital-to-analog converting method operating under two clock signals of different periods is disclosed. The method includes steps of monitoring a phase relationship between the two clock signals; starting transmission of a plurality of pre-stored serie... | 04/15/2003 |
