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IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing

Issue 8 • Aug 1993

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Displaying Results 1 - 10 of 10
  • Image sequence enhancement based on adaptive symmetric order statistics

    Publication Year: 1993, Page(s):504 - 509
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Statistical properties of the spatiotemporal center-weighted median (CWM) filter for image sequences are investigated. It is statistically shown that the CWM filter preserves image structures under motion at the expense of noise suppression. To improve the CWM filter so it can be effectively used in image sequence processing, the adaptive directional CWM filter (ADCWM) is proposed. This filter uti... View full abstract»

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  • Arithmetic for ternary number-theoretic transforms

    Publication Year: 1993, Page(s):529 - 531
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    A simplified arithmetic for the computation of ternary number-theoretic transforms is presented. The proposed arithmetic is based on the application of a code translation technique that was used by L.M. Leibowitz (1976) for the development of a simplified binary arithmetic for the computation of the Fermat number-theoretic transform View full abstract»

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  • Digital characterization techniques for the analog performance of mixed-signal devices

    Publication Year: 1993, Page(s):480 - 492
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    The authors describe a theoretical framework for obtaining a detailed characterization of the analog properties of a mixed-signal transmission channel and present experimental results for the technique applied to an actual device. The inputs to, and outputs from, the channel under test are all digital. They thus avoid the many problems associated with analog fixturing and wiring and obviate the ne... View full abstract»

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  • On the behavior of the double-loop sigma-delta modulator

    Publication Year: 1993, Page(s):467 - 479
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    The authors prove a stability theorem for the integrator states of the double-loop sigma-delta modulator with inputs chosen from a class of functions that satisfy certain boundedness conditions. This input class includes functions formed from the sum of a limited magnitude constant term and a finite sum of sinusoids of arbitrary amplitude and of nonzero frequency. To demonstrate the quality of the... View full abstract»

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  • Fast discrete extrapolation via the fast Hartley transform

    Publication Year: 1993, Page(s):502 - 504
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A fast algorithm for A. Papoulis's (1975) and R.W. Gerchberg's (1974) iterative extrapolation based on the fast Hartley transform (FHT) is presented. The low-pass filtering in the iterative procedure can be implemented by the FHT directly instead of by the fast Fourier transform (FFT) and the inverse FFT. M.S. Sabri and W. Steenart's (1978) example demonstrates that the FHT approach is simple to u... View full abstract»

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  • Adaptive IIR notch filter based on least mean p-power error criterion

    Publication Year: 1993, Page(s):525 - 528
    Cited by:  Papers (40)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A new second-order IIR adaptive notch filter (ANF) algorithm based on least-mean-p-power (LMP) error criterion is investigated. When the ANF is used to cancel 60-Hz interference in the recording of electrocardiograms (ECG), the performance of this adaptive algorithm with p=1 is better than that of the conventional least-mean-square (LMS, p=2) algorithm. Furthermore, when the ANF ... View full abstract»

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  • Matrix two-dimensional spectral factorization

    Publication Year: 1993, Page(s):509 - 511
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The existence of an asymmetric half-plane spectral factorization for a nonnegative two-dimensional matrix-valued spectral density is established under the conditions that the density and the logarithm of the determinant of the density are absolutely integrable on the torus. The proof gives a construction of the factors in terms of a family of one-dimensional spectral factorizations. An efficient a... View full abstract»

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  • An empirical study of high-order single-bit delta-sigma modulators

    Publication Year: 1993, Page(s):461 - 466
    Cited by:  Papers (214)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Computer simulations are used to determine the stability limits of single-bit delta-sigma modulators up to order 8. It is found that none of the existing criteria for stability are adequate for design. Plots of the maximum signal-to-noise ratio (SNR) achievable with a given modulator order and oversampling ratio (OSR) are presented. These graphs can be used to determine the modulator order and OSR... View full abstract»

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  • Limit cycle bounds for floating point implementations of second-order recursive digital filters

    Publication Year: 1993, Page(s):493 - 501
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    It is shown that floating point realizations of linearly stable systems can exhibit four fundamental types of free responses. Sufficient conditions for the existence or nonexistence of some of these periodic response types in a given system are presented. Explicit closed form conditions on the mantissa length to guarantee certain limit cycle bounds are provided. The effect of various floating poin... View full abstract»

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  • Feedback-based orthogonal digital filters

    Publication Year: 1993, Page(s):512 - 525
    Cited by:  Papers (3)  |  Patents (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    A synthesis procedure for generating orthogonal structures to implement arbitrary transfer functions is described. As compared to earlier techniques associated with orthogonal filter synthesis, which used a cascade of sections or a parallel combination of sections, this method uses feedback to simplify the design process, and results in filter structures that have the low-passband-sensitivity prop... View full abstract»

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Aims & Scope

This title ceased production in 2003. The current updated title is IEEE Transactions on Circuits and Systems II: Express Briefs.

Full Aims & Scope