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Full-Text Articles in Engineering
Computer Simulation Of Dynamic Systems, Charles G. Smith
Computer Simulation Of Dynamic Systems, Charles G. Smith
Retrospective Theses and Dissertations
Computer simulation of a control system is a valuable tool in design or performance evaluation. This is especially true when non-linear elements cannot be ignored and must be included within the model. A general purpose block diagram oriented simulation program will be developed which can utilize continuous, discrete and non-linear building blocks. The software tool will be demonstrated by means of an example.
Internal Precision And The Common Sample Rate, James C. Kirkwood
Internal Precision And The Common Sample Rate, James C. Kirkwood
Retrospective Theses and Dissertations
The relationship between internal precision and input/output precision and the ratio of sample frequency to signal frequency has been described in qualitative terms for the general case and in quantitative terms for many special cases. This paper attempts to generate quantitative approximated guidelines for the general case. Lowpass and bandpass digital filters are implemented using cascaded second order sections via a program that varies the amount of internal precision available for the emulation, and calculates the error produced compared to a 64 bit standard. The errors are plotted, and general equations relating input/output precision and internal precision and the ratio …
Suitability Of The Tms320 Digital Signal Processor In Digital Signal Processing Applications Requiring Multiple-Precision, Randall L. Walker
Suitability Of The Tms320 Digital Signal Processor In Digital Signal Processing Applications Requiring Multiple-Precision, Randall L. Walker
Retrospective Theses and Dissertations
The TMS320 single-chip digital signal processor, produced by Texas Instruments, shows promise for a long life-cycle not only because it fills a technical need in the digital signal processing field; but because it also represents an excellent early design. Furthermore, Texas Instruments has provided thorough software and development support. However, this chip was not designed to support digital signal processing applications which require multiple-precision operations. In this paper, algorithms were developed and expressed in macros that provide the capability of modeling systems requiring multiple-precision operations. Finally, a performance envelope showing the system complexity versus sampling bandwidth limitations is provided to …
Digital Signal Processing Capabilities Of The Fujitsu Mb8764, Harold B. Creech
Digital Signal Processing Capabilities Of The Fujitsu Mb8764, Harold B. Creech
Retrospective Theses and Dissertations
The Fujitsu MB8764 digital signal processing chip is designed to operate with a machine cycle of up to 10 MHz. The chip’s ability to perform a 16-by-16 bit multiply and add operation in one machine cycle makes it a good candidate for real time digital signal processing. Unlike the Intel 2920 the Fujitsu MB8764 does not have an onboard analog-to-digital, digital-to-analog converter. Therefore, this paper will be restricted to the operation of this device with digital data input and output. The use of the MB8764 as a digital filter is analyzed. Performance limitations due to finite word length, memory size …
Effects Of Finite Length Registers On A Modified Directform Realization Of A High Order H(Z) Transfer Function, Angel Vanrell
Effects Of Finite Length Registers On A Modified Directform Realization Of A High Order H(Z) Transfer Function, Angel Vanrell
Retrospective Theses and Dissertations
When a digital process is realized on a general-purpose computer or a special-purpose hardware, errors due to finite register length are introduced. These errors are due primarily to arithmetic roundoff, coefficient quantization, and scaling rules. This paper addresses the effects of finite word length on a direct-form implementation of a high order H (z) transfer function. The development and analysis of a modified direct-form realization suggested by Dr. Fred O. Simons, are carried out via FORTRAN emulation of a fourth-order low-pass Butterworth filter. The results are presented as a parametric tradeoff of signal-to-noise ratio at the filter output versus word …
The Frequency Response Computation Of H(Z) Models That Include Digital Error Effects, Carol R. Smith
The Frequency Response Computation Of H(Z) Models That Include Digital Error Effects, Carol R. Smith
Retrospective Theses and Dissertations
Pulse responses are not suitable for evaluating H(z) frequency responses that include digital errors. Digital error effects, however, are conveniently included in H(z) frequency response calculations based on the step response. A non-real time algorithm for computing the frequency response of a real time digital filters based on the filter step response is developed and verified through an example.
Finite Impulse Response Filter Implementation Via Windowing Technique, Thomas J. Horrigan
Finite Impulse Response Filter Implementation Via Windowing Technique, Thomas J. Horrigan
Retrospective Theses and Dissertations
This research report is devoted to an investigation of finite impulse response (FIR) filters and their implementation via windowing techniques. Analysis is restricted to those FIR filters that possess both a nonrecursive structure and a linear phase response. Initially an informative yet concise overview of FIR filters is presented. Some knowledge of "discrete – time" systems is assumed. Next, the concepts associated with FIR filter implementation through the utilization of window functions is developed. Analysis is performed in both the time and frequency domains. Results obtained define optimal window function criteria. The last design technique is devoted to computer aided …
The Fundamental Hardware Elements And Options Of Digital Signal Processing, Mark A. Hemmerlein
The Fundamental Hardware Elements And Options Of Digital Signal Processing, Mark A. Hemmerlein
Retrospective Theses and Dissertations
The hardware available for digital signal processing is evaluated. The elements required for implementation of digital signal processing applications are identified. These elements--memories, ALUs and multipliers -- are analyzed. Then the operation of parts which make up a range of possible solutions are evaluated. Thus, the graduating engineer is aided in making a transition from the theoretical to the practical world.
A Real Time Microprocessor Based Digital Filter Implementation, Mark H. Shaver
A Real Time Microprocessor Based Digital Filter Implementation, Mark H. Shaver
Retrospective Theses and Dissertations
A major break-through in the real-time digital simulation of dynamic models has occurred with the introduction of the Intel 2920 digital signal processing chip. The problems and potentials for this new device are demonstrated by implementing an elliptic function digital low pass filter via the bilinear z-transform approach. The software implementation is presented. Debugging and software verification are accomplished via manufacturer's simulation software tools. The hardware performance is verified in the laboratory. The results of these efforts point to much promise for wide scale applications, however, problems associated with performance indicate early version chip problems.