In this paper, we describe some aspects of information and its cognate the uncertainty from the design of perspectives of intelligent systems. The discussion is centered around the statistical uncertainty and the cogn...
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A simulated annealing optimization algorithm is used in the design of finite impulse response (FIR) filters and fifth-order LDI all-pole digital filters. Using simulated annealing, sin(x)/x precompensating scheme base...
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A simulated annealing optimization algorithm is used in the design of finite impulse response (FIR) filters and fifth-order LDI all-pole digital filters. Using simulated annealing, sin(x)/x precompensating scheme based on both the FIR and LDI structures is presented. The design process begins with a random set of finite precision coefficients for the filter, making no attempt to obtain a good initial starting coefficient. The use of simulated annealing allows the use of nonclassical transfer functions in the design of digital filters, i.e. it allows for the design of arbitrary magnitude response filters.< >
A global methodology for the design of analog and mixed analog/digital integrated systems is outlined. The methodology calls for a flexible framework that combines CAD software, simulators, measurement set-ups, and da...
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A global methodology for the design of analog and mixed analog/digital integrated systems is outlined. The methodology calls for a flexible framework that combines CAD software, simulators, measurement set-ups, and data-processing software. As an application example within such a framework, error modeling and estimation in multistage analog/digital converters is discussed using a new algorithm.< >
The paper describes some aspects of information and its cognate uncertainty, from the point of view of intelligent systems. The discussion is centred around the statistical uncertainty and the cognitive uncertainty, a...
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The paper describes some aspects of information and its cognate uncertainty, from the point of view of intelligent systems. The discussion is centred around the statistical uncertainty and the cognitive uncertainty, an important class of uncertainty that arises from the human thinking and cognition process. Also, ways are discussed in which these two uncertainties can help in the design of new classes of sensors and intelligent systems.< >
An intuitive behavioral modelling language is introduced within the circuit simulator URECA. The URECA language is constructed using operators as extensions to the netlist format commonly found in analog simulators su...
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An intuitive behavioral modelling language is introduced within the circuit simulator URECA. The URECA language is constructed using operators as extensions to the netlist format commonly found in analog simulators such as SPICE. The operators have been developed to model input/output behavior in mixed signal circuits and describe common analog behavioral qualities. Several mixed analog/digital circuit examples are simulated using this language, and the accuracy and processing speed are discussed.< >
A new technique is presented for the design of faster ripple-carry adders. Although this design is structurally inherited from the Manchester carry adder, it operates much faster and cuts down the propagation delay of...
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A new technique is presented for the design of faster ripple-carry adders. Although this design is structurally inherited from the Manchester carry adder, it operates much faster and cuts down the propagation delay of the adder by close to 75 per cent. The main concept in this technique is the balance of charge throughout the nodes in the carry chain. This balance of charge, which is the consequence of selective pre-charging (SPC), causes the shifting of logic from 0 (or 1) to 1 (or 0) very quickly. The technique is implemented for a 4-bit adder module and the SPICE simulation results are compared with a similar Manchester carry adder.< >
A method is introduced for designing stable, active integrated ladder filters with canonic numbers of op amps from a class of hitherto problematic transfer functions including bandstop and even-order elliptic function...
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A method is introduced for designing stable, active integrated ladder filters with canonic numbers of op amps from a class of hitherto problematic transfer functions including bandstop and even-order elliptic functions. A variety of familiar parasitic-insensitive ladder structures can be produced by matrix methods while retaining the low sensitivity properties expected of passive simulations. The method is applicable to active-RC, switched-capacitor, and digital technologies.< >
KINFIDA (knowledge-based intelligent filter design assistant), a hybrid knowledge-based system with a model-based reasoning architecture for digital filter design, is described. It extends the concept of an isolated d...
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KINFIDA (knowledge-based intelligent filter design assistant), a hybrid knowledge-based system with a model-based reasoning architecture for digital filter design, is described. It extends the concept of an isolated digital signal processing CAD tool and provides a closed-loop design environment where the system expertise can grow incrementally with minimal effect on the controls and the reasoning process. It utilizes IEEE signal processing libraries and is implemented in Nexpert Object, a commercial object-rule-based development system. The user interface is implemented using the X11 toolkit package. Using an interactive human interface, KINFIDA suggests likely filter approaches, estimates undetermined parameters, provides performance estimates, and suggests candidate VLSI technologies satisfying a desired filtering operation.< >
Concerns the navigation of unknown regions by autonomous underwater vehicles using high-resolution sonar beamforming. A general computer simulation that allows the analysis of a broadband fast Fourier transform (FTT) ...
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Concerns the navigation of unknown regions by autonomous underwater vehicles using high-resolution sonar beamforming. A general computer simulation that allows the analysis of a broadband fast Fourier transform (FTT) beamformer using finite wordlength arithmetic has been developed. It is possible to vary individually the wordlengths of each processor involved in the beamforming calculations, as well as the target effects such as background noise, angle to target, and signal frequency (due to Doppler and other effects). It allows the system designer to evaluate the performance of a broadband FFT beamformer system with quantization. noise, and various target effects included. A significant feature of the simulation is the ability to consider individual effects as well as various combinations of effects, in order to determine the limiting factors in the sonar design.< >
A reliable specification and execution tool (RSET) that supports a rigorous object-oriented constraint-based specification method called box structures for object-oriented development (Box Structures/OOD) is described...
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A reliable specification and execution tool (RSET) that supports a rigorous object-oriented constraint-based specification method called box structures for object-oriented development (Box Structures/OOD) is described. RSET also supports the simulation of systems from their specifications. The object-oriented paradigm employs concepts such as object classification, relationships between objects, and constraints on objects, that are natural to human discourse. In all cases, there is exactly a one-to-one correspondence between objects in the specification and the specifier's view of the objects in the system being specified. There is a straightforward mapping from the specification to an Ada implementation. The specifications are formal and support automatic consistency and completeness checking. The specifications are executable, allowing systems to be simulated at the specification level. Box Structures/OOD is uniformly applicable to the specification, design, and implementation of large complex software systems (e.g. real-time, distributed, parallel).< >
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