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layout="Title" style="Title">Daubechies Wavelets</Text-field></Input></Group><Group><Input><Text-field layout="Author" style="Author"><Font bold="false" foreground="[0,0,0]" underline="false">Edward Aboufadel
Grand Valley State University, USA
aboufade@gvsu.edu<Font encoding="ISO8859-1">
\251 2001 Edward Aboufadel</Font></Font></Text-field></Input></Group><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1">Introduction</Text-field></Title><Group><Input><Text-field layout="Normal" style="Text">This worksheet demonstrates the use of Maple for exploring the properties of the Daubechies scaling function D[4], along with the family of wavelets associated with this function.  The compact support, averaging, orthogonality, and regularity properties of D[4] are explored in this worksheet, along with graphs of the mother, daughter, and son wavelets.</Text-field></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1">What Are Daubechies Wavelets?</Text-field></Title><Text-field layout="Normal" style="Normal">Technical sources for this worksheet are <Font executable="false">[AS1], [AS2], </Font>and <Font executable="false">[D]</Font>.</Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">There is a growing enthusiasm about the subject of wavelets.  Disciplines such as radiology, geology, computer science, music, and engineering provide a wide range of <Font executable="false">real</Font> applications of wavelets, including signal and image processing, denoising of data, and compression and retrieval of data.  These applications involve creating a set of basis functions called <Font executable="false">wavelets</Font> that efficiently capture the important information of a signal or function.  Generating a family of wavelets begins with a <Font executable="false">scaling function</Font> (also called the <Font executable="false">father wavelet</Font>), and representing functions or data using wavelets gives alternate and often useful ways to analyze the information.</Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">A family of wavelets form a basis of a function space and can be used to describe other functions or data.  In this way, wavelets are like the sine and cosine waves used in Fourier analysis.  Because sines and cosines (the basis functions of Fourier analysis) are periodic, Fourier methods provide excellent information about the big picture of functions, but not about the details. In contrast, wavelets can simultaneously supply both global and local information.  This is possible because a family of wavelets is generated by both <Font executable="false">dyadic scaling</Font> and <Font executable="false">translating</Font> parent functions, as opposed to the basic scaling of sines and cosines that occur in Fourier analysis.</Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">Ingrid Daubechies proved that it was possible to create a family of wavelets where the scaling function <Equation input-equation="phi(t);" style="2D Math">NiMtJSRwaGlHNiMlInRH</Equation> had the following properties:</Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">1.  Compact support of 0 <Font executable="false">&lt;</Font> <Font executable="false">t</Font> <Font executable="false">&lt;</Font> 3.  (That is, <Equation input-equation="phi(t) = 0;" style="2D Math">NiMvLSUkcGhpRzYjJSJ0RyIiIQ==</Equation> if <Font executable="false">t</Font> &lt; 0 or <Font executable="false">t</Font> &gt; 3.)</Text-field><Text-field layout="Normal" style="Normal">2.  Averaging:  The integral of <Equation input-equation="phi(t)" style="2D Math">NiMtJSRwaGlHNiMlInRH</Equation> on the interval 0 <Font executable="false">&lt;</Font> <Font executable="false">t</Font> <Font executable="false">&lt;</Font> 3 is 1.</Text-field><Text-field layout="Normal" style="Normal">3.  Orthogonality:  Translates <Equation input-equation="phi(t-m[1]);" style="2D Math">NiMtJSRwaGlHNiMsJiUidEciIiImJSJtRzYjRighIiI=</Equation> and <Equation input-equation="phi(t-m[2]);" style="2D Math">NiMtJSRwaGlHNiMsJiUidEciIiImJSJtRzYjIiIjISIi</Equation> are orthogonal (<Equation input-equation="m[1];" style="2D Math">NiMmJSJtRzYjIiIi</Equation> and <Equation input-equation="m[2];" style="2D Math">NiMmJSJtRzYjIiIj</Equation> are integers).</Text-field><Text-field layout="Normal" style="Normal">4.  Regularity:  Constant and linear functions can be reproduced by <Equation input-equation="phi;" style="2D Math">NiMlJHBoaUc=</Equation> and its translates.</Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">The scaling function is created, based on these conditions.  Every scaling function satisfies a <Font executable="false">dilation equation</Font> of the form</Text-field><Text-field layout="Normal" style="Normal"/><Text-field><Equation input-equation="phi(t) = Sum(c[k]*phi(2*t-k),k = -infinity .. infinity);" style="2D Math">NiMvLSUkcGhpRzYjJSJ0Ry0lJFN1bUc2JComJiUiY0c2IyUia0ciIiItRiU2IywmKiYiIiNGMEYnRjBGMEYvISIiRjAvRi87LCQlKWluZmluaXR5R0Y2Rjo=</Equation></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">where <Equation input-equation="c[k];" style="2D Math">NiMmJSJjRzYjJSJrRw==</Equation> are constants called <Font executable="false">refinement coefficients</Font>.  It can be shown that the four conditions above lead to the following values for the refinement coefficients:</Text-field><Text-field layout="Normal" style="Normal"/><Text-field><Equation input-equation="c[0] = (1+sqrt(3))/4;" style="2D Math">NiMvJiUiY0c2IyIiISomLCYiIiJGKi0lJXNxcnRHNiMiIiRGKkYqIiIlISIi</Equation><Font background="[0,0,0]" family="Times New Roman">       </Font><Equation input-equation="c[1] = (3+sqrt(3))/4;" style="2D Math">NiMvJiUiY0c2IyIiIiomLCYiIiRGJy0lJXNxcnRHNiNGKkYnRiciIiUhIiI=</Equation><Font background="[0,0,0]" family="Times New Roman">       </Font><Equation input-equation="c[2] = (3-sqrt(3))/4;" style="2D Math">NiMvJiUiY0c2IyIiIyomLCYiIiQiIiItJSVzcXJ0RzYjRiohIiJGKyIiJUYv</Equation><Font background="[0,0,0]" family="Times New Roman">       </Font><Equation input-equation="c[3] = (1-sqrt(3))/4;" style="2D Math">NiMvJiUiY0c2IyIiJComLCYiIiJGKi0lJXNxcnRHRiYhIiJGKiIiJUYt</Equation></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">and the rest of the refinement coefficients are zero.  Since only four of the refinement coefficients are non-zero, the scaling function is called <Equation input-equation="D[4];" style="2D Math">NiMmJSJERzYjIiIl</Equation>.  Here is a graph of this function:</Text-field><Text-field layout="Normal" style="Normal"/><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">restart;</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal">Load the scaling function <Equation input-equation="D[4];" style="2D Math">NiMmJSJERzYjIiIl</Equation>.  (Note:  The files wavelet.ind and wavelet.lib need to be in the Maple library folder.  <Equation input-equation="D[4];" style="2D Math">NiMmJSJERzYjIiIl</Equation> is defined in <Font executable="false">Maple</Font> by a look-up table so that it is constant on intervals of the form [<Font executable="false">i</Font>/512, (<Font executable="false">i</Font> + 1)/512] for integers <Font executable="false">i</Font>.  This leads to some numerical inaccuracies below.)</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">with(D4wavelets);  with(student);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal"><Equation input-equation="D[4]" style="2D Math">NiMmJSJERzYjIiIl</Equation> is now defined in <Font executable="false">Maple</Font> as a function of one variable.  </Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(D4(t), t=-5..5, axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">D4(1.6);  D4(2); D4(-6.2);  D4(Pi/2);  #Some sample values.</Font></Text-field></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1"><Font executable="false">Exploring the Properties of </Font><Equation input-equation="D[4];" style="2D Math_2">NiMmJSJERzYjIiIl</Equation></Text-field></Title><Group><Input><Text-field layout="Normal" style="Normal">The compact support condition is clear from the graph.  In order to investigate the other properties, we need to define the inner product of two functions:</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">ip:= (f,g) -&gt; evalf(simpson(f*g, t=-2..10, 3072));</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal">(Note that due to the non-symbolic nature of <Equation input-equation="D[4];" style="2D Math">NiMmJSJERzYjIiIl</Equation>, a numerical integration method such as Simpson's Rule is preferred.  Consequently, the calculated value of the inner product will not be exact.)</Text-field></Input></Group><Section collapsed="true"><Title><Text-field layout="Heading 2" style="Heading 2">Sub-Section I: Averaging</Text-field></Title><Text-field layout="Normal" style="Normal">Here, we compute the integral of <Equation input-equation="D[4];" style="2D Math">NiMmJSJERzYjIiIl</Equation> on the compact support, which should equal 1.</Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">ip(D4(t), 1);</Font></Text-field></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 2" style="Heading 2">Sub-Section II:  Orthogonality</Text-field></Title><Text-field layout="Normal" style="Normal">Here, we compute the inner product of various translates to see if they are zero.  Graphs of the product of the two functions are also included.</Text-field><Text-field layout="Normal" style="Normal"/><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">ip(D4(t), D4(t-1));</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(D4(t)*D4(t-1), t=-5..5, axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">ip(D4(t+2), D4(t-2));</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(D4(t+2)*D4(t-2), t=-5..5, axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">ip(D4(t+1), D4(t+2));</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(D4(t+1)*D4(t+2), t=-5..5, axes=boxed);</Font></Text-field></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 2" style="Heading 2">Sub-Section III:  Regularity</Text-field></Title><Text-field layout="Normal" style="Normal">The idea here is that for any function <Font executable="false">g</Font>(<Font executable="false">t</Font>) =<Font executable="false">mt + b</Font>, we can find coefficients <Equation input-equation="a[k];" style="2D Math">NiMmJSJhRzYjJSJrRw==</Equation> such that</Text-field><Text-field><Equation input-equation="g(t) = Sum(a[k]*D[4](t-k),k = -infinity .. infinity);" style="2D Math">NiMvLSUiZ0c2IyUidEctJSRTdW1HNiQqJiYlImFHNiMlImtHIiIiLSYlIkRHNiMiIiU2IywmRidGMEYvISIiRjAvRi87LCQlKWluZmluaXR5R0Y4Rjw=</Equation><Font background="[0,0,0]" family="Times New Roman">.</Font></Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">In fact, <Equation input-equation="a[k] = mk+b+(3-sqrt(3))*m/2;" style="2D Math">NiMvJiUiYUc2IyUia0csKCUjbWtHIiIiJSJiR0YqKigsJiIiJEYqLSUlc3FydEc2I0YuISIiRiolIm1HRioiIiNGMkYq</Equation>.</Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal">As an example, consider <Font executable="false">g</Font>(<Font executable="false">t</Font>)= -2<Font executable="false">t</Font> + 5.</Text-field><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">g:= t -&gt; -2*t+5;</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">m:=-2;  b:=5;</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">a:= k -&gt; m*k + b + (3-sqrt(3))*m/2;</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal">We will consider various finite sums.</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">g_rep:= (init, fin) -&gt; Sum(a(k)*D4(t-k), k=init..fin);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">g_rep(0, 2);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal">In the following, we can see how the finite sum reproduces <Font executable="false">g</Font>(<Font executable="false">t</Font>).  As the range on <Font executable="false">k</Font> expands, so does the interval in which the sum equals the linear function.</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot([g_rep(0,2),g(t)], t=-5..5, color=[red, blue], axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot([g_rep(-1,2),g(t)], t=-5..5, color=[red, blue], axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot([g_rep(-1,3),g(t)], t=-5..5, color=[red, blue], axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot([g_rep(-2,3),g(t)], t=-5..5, color=[red, blue], axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot([g_rep(-3,3),g(t)], t=-5..5, color=[red, blue], axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot([g_rep(-4,3),g(t)], t=-5..5, color=[red, blue], axes=boxed);</Font></Text-field></Input></Group></Section></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1">The Family of Wavelets Associated with <Equation input-equation="D[4]" style="2D Math_3">NiMmJSJERzYjIiIl</Equation></Text-field></Title><Text-field layout="Normal" style="Normal">Once the scaling function, or father wavelet, is defined, we can define the mother wavelet, sons, and daughters.  For the <Equation input-equation="D[4];" style="2D Math">NiMmJSJERzYjIiIl</Equation> family, the mother wavelet <Equation input-equation="psi;" style="2D Math">NiMlJHBzaUc=</Equation> is defined in terms of the scaling function by</Text-field><Text-field layout="Normal"><Equation input-equation="-(1+sqrt(3))*D[4](2*t-1)/4+(3+sqrt(3))*D[4](2*t)/4-(3-sqrt(3))*D[4](2*t+1)/4+(1-sqrt(3))*D[4](2*t+2)/4;" style="2D Math">NiMsKiooLCYiIiJGJi0lJXNxcnRHNiMiIiRGJkYmLSYlIkRHNiMiIiU2IywmKiYiIiNGJiUidEdGJkYmRiYhIiJGJkYvRjVGNSooLCZGKkYmRidGJkYmLUYsNiNGMkYmRi9GNUYmKigsJkYqRiZGJ0Y1RiYtRiw2IywmRjJGJkYmRiZGJkYvRjVGNSooLCZGJkYmRidGNUYmLUYsNiMsJkYyRiZGM0YmRiZGL0Y1RiY=</Equation></Text-field><Text-field layout="Normal" style="Normal"/><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">psiD4:= t -&gt; -(1+sqrt(3))/4*D4(2*t-1)+(3+sqrt(3))/4*D4(2*t)-(3-sqrt(3))/4*D4(2*t+1)+ (1-sqrt(3))/4*D4(2*t+2):</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(psiD4(t), t=-2..3, axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal">Note that the support of the mother wavelet is [-1, 2].</Text-field><Text-field layout="Normal" style="Normal">The son wavelets are created by dyadic scaling and translations of the father wavelet, while the daughter wavelets are created by dyadic scaling and translations of the mother wavelet.  For example:</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(D4(2*t-3), t=-1..4, title=`a first generation son`, axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(psiD4(2^2*t-1), t=-1..4, title=`a second generation daughter`, axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(psiD4(2^(-3)*t-1), t=0..30, title=`a great grandmother?`, axes=boxed);</Font></Text-field></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1">Analyzing a Function with the <Equation input-equation="D[4]" style="2D Math_4">NiMmJSJERzYjIiIl</Equation> Family</Text-field></Title><Text-field layout="Normal" style="Normal">The set of functions {<Equation input-equation="psi(2^n*t-k);" style="2D Math">NiMtJSRwc2lHNiMsJiomKSIiIyUibkciIiIlInRHRitGKyUia0chIiI=</Equation>| <Font executable="false">n</Font>, <Font executable="false">k</Font> are integers} form a basis for <Equation input-equation="L^2;" style="2D Math">NiMqJCUiTEciIiM=</Equation>(<Font executable="false">R</Font>).  Here is an example to demonstrate how to write a function in <Equation input-equation="L^2;" style="2D Math">NiMqJCUiTEciIiM=</Equation>(<Font executable="false">R</Font>) as a linear combination of wavelets.  We will use a function with compact support:</Text-field><Text-field layout="Normal" style="Normal"/><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">f:= t -&gt; piecewise (0&lt;t and t&lt;=1, sin(Pi*t));</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot(f(t), t=-1..2, axes=boxed);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal">Our goal is to determine constants <Equation input-equation="p[n,k];" style="2D Math">NiMmJSJwRzYkJSJuRyUia0c=</Equation> so that</Text-field><Text-field><Equation input-equation="f(t) = Sum(Sum(p[n,k]*psi(2^n*t-k),k = -infinity .. infinity),n = -infinity .. infinity);" style="2D Math">NiMvLSUiZkc2IyUidEctJSRTdW1HNiQtRik2JComJiUicEc2JCUibkclImtHIiIiLSUkcHNpRzYjLCYqJikiIiNGMUYzRidGM0YzRjIhIiJGMy9GMjssJCUpaW5maW5pdHlHRjtGPy9GMUY9</Equation></Text-field><Text-field layout="Normal" style="Normal">These constants can be found using the Orthogonal Decomposition Theorem.  </Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"/></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">p:= (n,k) -&gt; ip(f(t), psiD4(2^n*t-k))/ip(psiD4(2^n*t-k), psiD4(2^n*t-k));</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal">We will compute several of these constants, which will take a bit of time.</Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">for n1 from -3 to 1 do  for k1 from -1 to 1 do</Font></Text-field><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">p1[n1,k1]:=p(n1,k1); print(n1, k1, p1[n1, k1]); od;  od;</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">f_rep:= t-&gt; sum(sum(p1[n,k]*psiD4(2^n*t-k),k = -1 .. 1),n = -3..1):</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal"/></Input></Group><Group><Input><Text-field layout="Normal" prompt="&gt; " style="Maple Input"><Font italic="false" underline="false">plot([f_rep(t),f(t)], t=-2..4, color=[red, blue], axes=boxed, thickness=2);</Font></Text-field></Input></Group><Group><Input><Text-field layout="Normal" style="Normal">The linear combination is beginning to capture the shape of <Font executable="false">f</Font>(<Font executable="false">t</Font>).  With many more terms, we can generate a better approximation.</Text-field></Input></Group></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1"><Font executable="false">Conclusion</Font> </Text-field></Title><Text-field><Font background="[0,0,0]" family="Times New Roman">The <Font background="[0,0,0]" bold="false" executable="false" family="Times New Roman" foreground="[0,0,0]" size="12" underline="false">D4wavelet</Font><Font background="[0,0,0]" family="Times New Roman"> package was written so that students could explore its properties without having to worry about creating the scaling function through a fixed point method.  With this <Font background="[0,0,0]" bold="false" executable="false" family="Times New Roman" foreground="[0,0,0]" size="12" underline="false">Maple</Font><Font background="[0,0,0]" family="Times New Roman"> package, it is easy to graph members of this family of wavelets, and to investigate various properties of the family. </Font></Font></Font></Text-field></Section><Section collapsed="true"><Title><Text-field layout="Heading 1" style="Heading 1">References</Text-field></Title><Text-field layout="Normal" style="Normal"><Font executable="false">[AS1]  </Font>Aboufadel, E., and Schlicker, S., <Font executable="false">Discovering Wavelets</Font>, 1999, Wiley.</Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font executable="false">[AS2]</Font> Aboufadel, E., and Schlicker, S., "Wavelets, Introduction", in <Font executable="false">Encyclopedia of Physical Science and Technology, 3rd edition</Font> (Robert A. Meyers, editor), 2001, Academic Press.</Text-field><Text-field layout="Normal" style="Normal"/><Text-field layout="Normal" style="Normal"><Font executable="false">[D]</Font>  Daubechies, I., <Font executable="false">Ten Lectures on Wavelets</Font>, 1992, SIAM.</Text-field><Text-field layout="Normal" style="Normal"/></Section><Text-field layout="Normal" style="Text"/><Group><Input><Text-field layout="Normal" style="Text"><Font italic="true">Legal Notice: The copyright for this application is owned by the author(s). Neither Maplesoft nor the author are responsible for any errors contained within and are not liable for any damages resulting from the use of this material.. This application is intended for non-commercial, non-profit use only. Contact the author for permission if you wish to use this application in for-profit activities.</Font>
</Text-field></Input></Group><Group><Input><Text-field alignment="centred"><Image height="33" 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