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2355 results about "A d converter" patented technology

Scanning device for coded data

A scanning device for: scanning coded data disposed on a surface; and generating interaction data based on the sensed coded data, the interaction data being indicative of interaction of the scanning device with the surface; the coded data including, at a plurality of locations on the interface surface, a corresponding plurality of coded data portions, the scanning device comprising: (a) a laser source and scan optics configured to emit a scanning beam through an aperture in a housing of the scanning device, the scanning beam being directed in first and second orthogonal directions to thereby generate a raster scan pattern over a scanning patch, the scanning patch being positioned to cause the exposure of the at least one coded data portion when the surface and the sensing device are positioned operatively with respect to each other; (b) a photodetector for detecting reflection of the scanning beam from the surface, thereby to capture sample information; (c) at least one analog to digital converter for converting the captured sample information into sample data; (d) a first framestore for storing successive sample data as image data; (e) an image processor for processing the image data to generate processed image data; (e) a host processor for generating the interaction data based at least partially on the processed image data.

Apparatus and method for identifying and simultaneously displaying images of musical notes in music and producing the music

InactiveUS20050190199A1Reduce processor loadGearworksMusical toysDisplay deviceAnalog-to-digital converter
Our invention is an apparatus and method to identify and simultaneously visualize and hear musical notes contained in an analog or digital sound wave. Musical notes are expanded into a language for the eye as well as the ear. An analog-to-digital converter processes an analog sound wave to provide a digital sound wave. Component frequencies of the digital sound waves are identified, filtered and translated to their corresponding musical note and volume. As the original digital sound wave is sent through a digital-to-analog converter and output to an audio device, the identified musical notes are synchronously output to a display device. User-specified parameters, adjustable at any time before, during or after the music-playing process, control frequency filtering, the graphic display of the identified musical notes and the graphical background on which the musical notes are displayed. Users may also utilize existing, or create their own, computer programming code software modules, known as plug-ins, or hardware components, to interface with the invention to extend and control the invention's functionality. Because the synchronous musical note identification and visualization process occurs extremely quickly, the method applies and works in real-time for live music.

Delta-sigma A/D converter

A delta-sigma modulator comprising a first quantizer providing a first digital signal d0(k) representing the input signal g(t); a loop filter with input signal paths; a loop quantizer providing a corrective digital signal d1(k) representing the loop filter's output signal y(t); an array of feedback DACs D/A converting the sum d(k)=df(k)=d0(k)+d1(k) of the first and the corrective digital signals and injecting feedback signals into the loop filter.The loop filter's input node is applied the difference of the input signal g(t) and the global analog feedback signal a3(t). The global feedback signal a3(t) is delayed several clock cycles with respect to the digital output signal d(k). The delay is used to carry out mismatch-shaping and deglitching algorithms in the feedback DACs. The feedback DACs' different delays and gain coefficients are designed such that the modulator is stable. The filter's input signal paths and the compensating DAC are designed such that the gain from the input signal g(t) to the loop quantizer is small, ideally zero. Thus, the loop quantizer's resolving range can be a fraction of the first quantizer's resolving range, whereby the output signal's d(k) resolution can be much higher than the individual resolutions of d0(k) and d1(k).The delta-sigma modulator is well suited for the implementation of high-resolution wide-bandwidth A/D converters. Important applications include digital communication systems.

Oversampling pulse oximeter

An oversampling pulse oximeter includes an analog to digital converter with a sampling rate sufficient to take multiple samples per source cycle. In one embodiment, a pulse oximeter (100) includes two more more light sources (102) driven by light source drives (104) in response to drive signals from a digital signal processing unit (116). The source drives (104) may drive the sources (102) to produce a frequency division multiplex signal. The optical signals transmitted by the light sources (102) are transmitted through a patient's appendage (103) and impinge on a detector (106). The detector (106) provides an analog current signal representative of the received optical signals. An amplifier circuit (110) converts the analog current signal to an analog voltage signal in addition to performing a number of other functions. The amplifier circuit (110) outputs an analog voltage signal which is representative of the optical signals from the sources (102). This analog voltage signal is received by a fast A/D converter (112) which samples the analog voltage signal to generate a digital voltage signal which can be processed by the digital signal processing unit (116). The fast A/D converter (112) operates at a rate sufficient to take multiple samples per source cycle and may have a sampling frequency, for example, of over 41 kHz. The digital signal processing unit (116) implements software for averaging the samples over a source cycle for improved measurement consistency, improved signal to noise ratio and reduced A/D converter word length.

Residue-compensating A/D converter

An analog-to-digital converter system [50D] processing an input signal, g, which can be either a discrete-time or a continuous-time signal. A first quantizer [154] generates a first digital signal, d0(k), representing the sum of the input signal, g, and a dithering signal, y0. A digital-to-analog converter [156] generates an analog feedback signal, alpha, representing accurately the first digital signal, d0(k). The DAC [156] may be linearized by the use of mismatch-shaping techniques. A filter [158] generates the dithering signal, y0, by selectively amplifying in the signal band the residue signal, r0, defined as the difference of the input signal, g, and the analog feedback signal, alpha. Optional signal paths [166][168] are used to minimize the closed-loop signal transfer function from g to y0, which ideally will be zero. An analog compensation signal, m0, which is described by a well-controlled relationship to the residue signal, r0, is extracted from the filter [158]. Ideally, the closed-loop signal transfer function from g to m0 will be zero, or at least small in the signal band. A second quantizer [160] converts the analog compensation signal, m0, into a second digital signal, dm0(k). The two digital signals, d0(k) and dm0(k), are filtered individually and then added to form the overall output signal, dg(k). The second digital filter [164] has a low signal-band gain, which implies that the sensitivity to signal-band errors caused by the second quantizer [160] will be low. The output signal, dg(k), is a highly-accurate high-resolution representation of the input signal, g. Circuit imperfections, such as mismatch, gain errors, and nonlinearities, will cause only noise-like errors having a very low spectral power density in the signal band.The invention facilitates the implementation of uncalibrated highly-linear high-resolution wide-bandwidth A/D converters [50D], e.g., for use in digital communication systems, such as xDSL modems and other demanding consumer-market products for which low cost is of the essence.

Enhanced data converters using compression and decompression

An enhancement that reduces the digital interface rate of analog-to-digital (A/D) and digital-to-analog (D/A) converters through the use of compression and decompression is described. The present invention improves A/D converters by compressing the sampled version of the A/D converter's analog input signal in real time, thereby significantly decreasing the required bit rate of the A/D converter's digital interface. Similarly, the present invention improves D/A converters by decreasing the required bit rate of the D/A converter's digital interface. D/A converters enhanced by the present invention include a decompressor that decompresses the D/A converter's compressed digital input in real time, prior to conversion to an analog output signal. The present invention's simplicity and its ability to be implemented using multiple compression and decompression elements allow its use in A/D and D/A converters with arbitrarily high sampling rates. By selecting a desired compression ratio during lossy compression, users of the present invention can precisely control the bit rate of the A/D and D/A converter's digital interface. Users of the present invention can dynamically choose the desired balance between the quality and the bit rate of A/D and D/A converters by adjusting various compression and decompression control parameters.
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