By Artur Krukowski
ISBN-10: 030648708X
ISBN-13: 9780306487088
ISBN-10: 1402075588
ISBN-13: 9781402075582
This e-book provides the research of targeted kind of IIR polyphase clear out buildings mixed with frequency transformation concepts, and their software for customized fixed-point implementation. that includes a wealth of layout and research thoughts, it comprises enough introductory fabric to allow non-experts to appreciate the subjects.
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Extra resources for DSP system design : complexity reduced IIR filter implementation for practical applications
Example text
A simple digital integrator with the transfer function replaced the analog integrator. In order to simplify the analysis of the modulator the linear model of the quantizer was assumed which allowed ignoring the clipper. Also, the quantizer levels were assigned the values of ±1. Under these assumptions it is easy to find out the following difference equation: The equation (71) has an obvious equivalence in the z-domain: Equation (73) shows that the input x(k) simply goes straight through the modulator, delayed by only one sample.
The difference is that the PFE calculates sections with numerator order one less than their denominator one. The method presented in this chapter calculates sections having the numerator order equal to the one of its denominator. 2. MULTIRATE FILTERS IN DATA CONVERTERS Before physical signals can be processed digitally they have to be converted from the analog to the digital form, by means of an analog-todigital (A/D) converter. Unfortunately this conversion introduces distortion. The stringent requirements, which the modern market imposes on A/D conversion, became achievable only due to the advent of fast and complex integrated circuits.
In this section we first look at the requirements to be met by the Nyquist and the oversampling A/D converters in digital signal processing applications and the arguments in view of the intermediate stage 1-bit coding. Then the typical modulator is presented. The quantization noise shaping by the modulators and the effects of the noise on the resolution of the A/D converter are also presented. 1 Nyquist-rate converter versus oversampling ones The function of an A/D converter is to convert a continuous-time, analog input signal x(t) into a sequence of digital codes y(k).
DSP system design : complexity reduced IIR filter implementation for practical applications by Artur Krukowski
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