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  • 1
    Electronic Resource
    Electronic Resource
    Decoupling of the overflow and quantization phenomena in orthogonal biquad recursive digital filters (1987)
    Springer
    Circuits, systems and signal processing 6 (1987), S. 457-470 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In digital communication networks, a special class of complex biquad recursive digital filters called orthogonal filters is increasingly being used. The separate effects of the overflow and quantization nonlinearities on these orthogonal filters' responses have been investigated [5], [6]. In this paper we examine the zero-input stability properties of the actual orthogonal filter having both overflow and quantization nonlinearities. The overflow nonlinearities considered include saturation, bit-by-bit inversion, zeroing, and modulo 2 arithmetic. The quantization techniques used may be roundoff, magnitude, or value truncation. An example demonstrates the adverse coupling effect between the overflow and quantization nonlinearities. Two criteria are therefore derived to ensure asymptotic overflowstability of the filter in the presence of quantization. These criteria have been translated to the coefficient plane; various regions corresponding to different minimum wordlengths required to ensure decoupling of the overflow and quantization phenomena have been derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600235
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Design criterion for zero-input asymptotic overflow-stability of recursive digital filters in the presence of quantization (1985)
    Springer
    Circuits, systems and signal processing 4 (1985), S. 485-502 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper investigates the zero-input stability properties of the exact second-order recursive digital filter having both overflow and quantization non-linearities. Two examples demonstrate the adverse influence of quantization on the overflow-stability property of the filter. Three sets of conditions are presented to ensure asymptotic overflow-stability in the presence of quantization. Using these criteria, various regions in the coefficient plane corresponding to different minimum internal wordlengths required to ensure the non-interaction of overflow and quantization are derived. These results thus form a useful design criterion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01601797
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hybrid coders with motion compensation (1992)
    Springer
    Multidimensional systems and signal processing 3 (1992), S. 241-266 
    Details
    ISSN: 1573-0824
    Keywords: motion compensation ; motion estimation ; interframe coding ; intraframe coding ; hybrid coding ; correlation matrix ; distortion rate function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper investigates analytically the effects of motion compensation in a coder based on the observed properties of motion-compensated frame difference (MCFD) signals. The AR(1) processes with a given pixel-to-pixel autocorrelation coefficient will be used to model the intraframe images. For interframe motion, each image is allowed to have both moving and nonmoving parts, with the moving parts executing a range of translational motion. From this mathematical model, the statistical characteristics of MCFD signals are derived. Motion compensation gain, 2-D intraframe transform gain, and hybrid gain are next evaluated to ascertain their suitability for the coding process. Experimental results on the Trevor sequence seem to confirm the model and conform with its analytical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01942044
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    Paper (German National Licenses)
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  • 4
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    A note on seepage from retaining wall weepholes (1993)
    Geological Society of London
    Details
    Publication Date: 1993-02-01
    Print ISSN: 1470-9236
    Electronic ISSN: 2041-4803
    Topics: Geosciences
    Published by Geological Society of London
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