Custom Filters

... 297CHAPTER1 7Custom FiltersMost filters have one of the four standard frequency responses: low-pass, high-pass, band-passor band-reject. This chapter presents a general method of designing digital filters ... ratio of the signal power to the noise power Chapter 17- Custom Filters 309Sample number0 100 200 300 400 500-0.50.00.51.01.5a. Moving average filterSample number0 100 200 3...

Ngày tải lên: 13/09/2012, 09:50

... in some way. Analog(electronic) filters can be used for these same tasks; however, digital filters can achieve farsuperior results. The most popular digital filters are described and compared ... with either analog or digital filters. Whichis better? Analog filters are cheap, fast, and have a large dynamic range inboth amplitude and frequency. Digital filters, in comparison...

Ngày tải lên: 13/09/2012, 09:50

... variety of recursivefilters in more detail. Be aware that the moving average recursive filter is verydifferent from typical recursive filters. In particular, most recursive filters havean infinitely ... To understand this Chapter 15- Moving Average Filters 283FIGURE 15-4Frequency response of the Blackman windowand Gaussian filter kernels. Both these filtersprovide better stopband at...

Ngày tải lên: 13/09/2012, 09:50

... 285CHAPTER16h[i] 'sin(2B fCi )i BWindowed-Sinc FiltersWindowed-sinc filters are used to separate one band of frequencies from another. They are verystable, ... convolution, windowed-sinc filters are easy to program, but slow to execute. Chapter18 shows how the FFT can be used to dramatically improve the computational speed of thesefilters. Strategy of the ... Signal Processing292...

Ngày tải lên: 13/09/2012, 09:50

... have less performance and flexibilitythan other digital filters. Recursive filters are also called Infinite Impulse Response (IIR) filters, since their impulse responses are composed of decaying ... distinguishes themfrom digital filters carried out by convolution, called Finite Impulse Response (FIR) filters. Thischapter is an introduction to how recursive filters operate, a...

Ngày tải lên: 13/09/2012, 09:50

... CHAPTER 5 Finite Impulse Response Filters 5.1 INTRODUCTION From the previous two chapters, we have become familiar with the magnitude ... Design, by B. A. Shenoi Copyright © 2006 John Wiley & Sons, Inc. 249 250 FINITE IMPULSE RESPONSE FILTERS output y(n) can be obtained by applying the recursive algorithm on (5.4). We get the output ... or degree of the polynomial H(z −1 ) =  N n=0 h...

Ngày tải lên: 29/09/2013, 21:20

... CHAPTER 4 Infinite Impulse Response Filters 4.1 INTRODUCTION In Chapter 2, we discussed the analysis of discrete-time systems to obtain ... given by H(z) =  M k=0 b(k)z −k  N k=0 a(k)z −k ; a(0) = 1 (4.3) 188 INFINITE IMPULSE RESPONSE FILTERS Let us consider a few properties of the transfer function when it is evaluated on the unit ... (4.8) where u =  M k=0 b(k) sin(kω)  M k=0 b(k) co...

Ngày tải lên: 29/09/2013, 21:20

... http://developer.android.com/guide/topics/intents/intents -filters. html 8 888 19. Android – Intent Filters Intent Filters 8 Intent Resolution 9 999 19. Android – Intent Filters Intent Filters 9 Intent Resolution Như ... cis493.intentfilters.FancySms.txtMsg.setText(msg); } }// class SMSReceiver 17 17 19. Android – Intent Filters Intent Filters 17 Questions 18 18 19. Android – Inte...

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