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Browsing by Author "Beltran, L. A. A."

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  • High-performance computing for real-time spectral estimation
    Publication . Madeira, M. M.; Bellis, S. J.; Beltran, L. A. A.; Gonzalez, J. S.; Nocetti, D. F. G.; Marnane, W. P.; Tokhi, M. O.; Ruano, M. Graça
    This paper presents two separate investigations into the real-time implementation of the modified covariance spectral estimator: one comparing performances on digital signal processors, the TMS320C40, and the recently released ADSP2016x (SHARC); another using application-specific custom circuitry. The advantages and disadvantages of each of these different approaches are reviewed, resulting in the design of a field-programmable gate array/digital signal processor-based high-performance system that combines the hardware and software approaches. In conjunction with pulsed Doppler ultrasound blood-flow detectors, the spectral estimator offers increased sensitivity in the non-invasive detection of arterial disease. (C) 1999 Elsevier Science Ltd. All rights reserved.
    1999-05-01Journal article Restricted access Show more
  • High-performance real-time implementation of a spectral estimator
    Publication . Madeira, M. M.; Beltran, L. A. A.; Gonzalez, J. S.; Nocetti, F. G.; Tokhi, M. O.; Ruano, M. Graça
    Doppler blood flow spectral estimation is a common technique of noninvasive cardiovascular disease detection. Blood flow velocity and disturbance may be evaluated by measuring spectral mean frequency and bandwidth respectively. Aiming at minor stenosis diagnosis, parametric spectral estimators may be employed. These models present better spectral resolution than the FFT based ones, at the expense of higher computational burden. Seeking for an efficient real-time implementation of a blood now spectral estimation system, high performance techniques are being investigated. This paper compares the implementation of the Modified Covariance (MC) spectral estimator on two different DSP architectures: the TMS320C40 and the ADSP2016x (SHARC). Implementations are described and their performance assessed. Considerations about portability of algorithms, compiler optimisation levels and system dependence features are addressed. Copyright (C) 1998 IFAC.
    1998Conference object Unknown Show more