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Digital Signal (digital + signal)

Distribution by Scientific Domains
Engineering62%
Medical Sciences25%

Terms modified by Digital Signal

  • digital signal processing
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  • digital signal processor
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    Selected Abstracts

    Analysis and design of ribbon cables for high-speed digital applications

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 2 2002
    Chun-Wen Paul Huang
    Abstract Ribbon cables have been widely used as subsystem interconnections in a large number of digital systems, because they can convey numerous bits of a digital signal simultaneously. In this article, finite difference and finite difference time domain (FDTD) methods are used to analyze and optimize the electrostatic analysis design of ribbon cables, and measurements are used to verify the numerical results. © 2002 Wiley Periodicals, Inc. Int J RF and Microwave CAE 12: 148,158, 2002. [source]

    Flexible video cystoscope with built-in high-frequency cauterizing element for transurethral resection of bladder tumor

    INTERNATIONAL JOURNAL OF UROLOGY, Issue 12 2001
    MASAKO KAWAKAMI
    Abstract The major advantage of the flexible video cystoscope is that a digital signal can be obtained while high frequency cauterization is carried out. Cauterization while observing a digital signal picture was not possible before this new model was developed. We decided to use this new cystoscope to resect a bladder tumor and coagulate the bleeding because the patient could tolerate only local anesthesia due to severe heart disease complications. We successfully treated the patient with this technique and no complications were noted. This new flexible video cystoscope was found to be safe for resecting bladder tumor under local anesthesia. [source]

    Digital photography: A primer for pathologists

    JOURNAL OF CLINICAL LABORATORY ANALYSIS, Issue 2 2004
    Roger S. Riley
    Abstract The computer and the digital camera provide a unique means for improving hematology education, research, and patient service. High quality photographic images of gross specimens can be rapidly and conveniently acquired with a high-resolution digital camera, and specialized digital cameras have been developed for photomicroscopy. Digital cameras utilize charge-coupled devices (CCD) or Complementary Metal Oxide Semiconductor (CMOS) image sensors to measure light energy and additional circuitry to convert the measured information into a digital signal. Since digital cameras do not utilize photographic film, images are immediately available for incorporation into web sites or digital publications, printing, transfer to other individuals by email, or other applications. Several excellent digital still cameras are now available for less than $2,500 that capture high quality images comprised of more than 6 megapixels. These images are essentially indistinguishable from conventional film images when viewed on a quality color monitor or printed on a quality color or black and white printer at sizes up to 11×14 inches. Several recent dedicated digital photomicroscopy cameras provide an ultrahigh quality image output of more than 12 megapixels and have low noise circuit designs permitting the direct capture of darkfield and fluorescence images. There are many applications of digital images of pathologic specimens. Since pathology is a visual science, the inclusion of quality digital images into lectures, teaching handouts, and electronic documents is essential. A few institutions have gone beyond the basic application of digital images to developing large electronic hematology atlases, animated, audio-enhanced learning experiences, multidisciplinary Internet conferences, and other innovative applications. Digital images of single microscopic fields (single frame images) are the most widely utilized in hematology education at this time, but single images of many adjacent microscopic fields can be stitched together to prepare "zoomable" panoramas that encompass a large part of a microscope slide and closely simulate observation through a real microscope. With further advances in computer speed and Internet streaming technology, the virtual microscope could easily replace the real microscope in pathology education. Later in this decade, interactive immersive computer experiences may completely revolutionize hematology education and make the conventional lecture and laboratory format obsolete. Patient care is enhanced by the transmission of digital images to other individuals for consultation and education, and by the inclusion of these images in patient care documents. In research laboratories, digital cameras are widely used to document experimental results and to obtain experimental data. J. Clin. Lab. Anal. 18:91,128, 2004. © 2004 Wiley-Liss, Inc. [source]

    A fully integrated ultra-low power CMOS transmitter module for UWB systems

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009
    Tao Yuan
    Abstract A fully integrated CMOS ultra-wideband (UWB) transmitter module is proposed for UWB applications. The transmitter module consists of a band-notched UWB antenna and a transmitter IC which integrates a pulse generator, a gating signal generator and driver amplifiers (DAs). The drive amplifier uses a two-stage amplifier,a Class-E amplifier and a Class-A amplifier with switch control, to significantly reduce power consumption (522 ,W/20 Mbps). Fabricated using a 0.18-,m CMOS process, the generated pulse then passes through the DA, which not only drives the antenna but also shapes the generated digital signal to meet the Federal Communications Commission spectral mask specification. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2318,2323, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24632 [source]

    Stable signal recovery from incomplete and inaccurate measurements

    COMMUNICATIONS ON PURE & APPLIED MATHEMATICS, Issue 8 2006
    Emmanuel J. Candès
    Suppose we wish to recover a vector x0 , ,,, (e.g., a digital signal or image) from incomplete and contaminated observations y = A x0 + e; A is an ,, × ,, matrix with far fewer rows than columns (,, , ,,) and e is an error term. Is it possible to recover x0 accurately based on the data y? To recover x0, we consider the solution x# to the ,,1 -regularization problem where , is the size of the error term e. We show that if A obeys a uniform uncertainty principle (with unit-normed columns) and if the vector x0 is sufficiently sparse, then the solution is within the noise level As a first example, suppose that A is a Gaussian random matrix; then stable recovery occurs for almost all such A's provided that the number of nonzeros of x0 is of about the same order as the number of observations. As a second instance, suppose one observes few Fourier samples of x0; then stable recovery occurs for almost any set of ,, coefficients provided that the number of nonzeros is of the order of ,,/(log ,,)6. In the case where the error term vanishes, the recovery is of course exact, and this work actually provides novel insights into the exact recovery phenomenon discussed in earlier papers. The methodology also explains why one can also very nearly recover approximately sparse signals. © 2006 Wiley Periodicals, Inc. [source]

    Signal Dependence of Cross-Phase Modulation in WDM Systems

    EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 2 2000
    Lutz Rapp
    In intensity modulated direct detection wavelength division multiplexing (WDM) systems, the effect of cross-phase modulation (XPM) combined with groupvelocity dispersion causes signal distortion, which depends on the transmitted signals. The influence of the mutual dependence of these signals on the resulting degradation of the system performance is investigated theoretically and by means of simulations. Considering the propagation of two digital signals, the eye-closure penalty is determined for different bit patterns and consequences for system design are pointed out. An approximation method is described in order to provide a better understanding of the signal dependence of XPM. Finally, a technique reducing the impact of XPM on data transmission in WDM systems is proposed. [source]

    Development of recursive interpolated D/FFT for on-line and highly accurate frequency analysis

    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, Issue 5 2008
    Takashi Kuraishi Student Member
    Abstract Frequency analysis of digital signals based on discrete/fast Fourier transform (D/FFT) inevitably has some inherent drawbacks such as short-and long-range leakage. As one of the methods to overcome the above drawbacks, interpolated discrete/fast Fourier transform (IpD/FFT) has been proposed. IpD/FFT has the ability to improve accuracy considerably. We proposed IpD/FFT, combined with recursive algorithm (RA), to achieve on-line calculation. By evaluating the errors of the proposed method due to short-and long-range leakage, we showed that the proposed method can provide more accurate performance compared with recursive DFT (R-DFT). © 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [source]

    Design and signal-integrity analysis of a backplane for high-speed digital systems

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2005
    Hua Zhang
    Abstract The design of a backplane in high-speed digital systems is presented, with an emphasis on systematic analysis of the signal integrity using full-wave electromagnetic methods when the system carries high-speed digital signals. The simulation and measurement results in both the frequency and time domains are presented for a high-speed digital-circuit demo system at the data rate of 500 M/bs, and are in good agreement. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 194,199, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20768 [source]