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Diffstat (limited to 'macros/ncauer.sci')
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1 files changed, 69 insertions, 37 deletions
diff --git a/macros/ncauer.sci b/macros/ncauer.sci index d9a0684..dad3025 100644 --- a/macros/ncauer.sci +++ b/macros/ncauer.sci @@ -1,53 +1,85 @@ // Copyright (C) 2018 - IIT Bombay - FOSSEE -// // This file must be used under the terms of the CeCILL. // This source file is licensed as described in the file COPYING, which // you should have received as part of this distribution. The terms // are also available at // http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt -// Author:Sonu Sharma, RGIT Mumbai +// Original Source : https://octave.sourceforge.io/ +// Modifieded by: Abinash Singh Under FOSSEE Internship +// Last Modified on : 3 Feb 2024 // Organization: FOSSEE, IIT Bombay // Email: toolbox@scilab.in - function [Zz, Zp, Zg] = ncauer(Rp, Rs, n) -//Analog prototype for Cauer filter (Cauer filter and elliptic filters are same). - -//Calling Sequence -//[Zz, Zp, Zg] = ncauer(Rp, Rs, n) - -//Parameters -//n: Filter Order -//Rp: Peak-to-peak passband ripple in dB -//Rs: Stopband attenuation in dB - -//Description -//It gives an analog prototype for Cauer filter of nth order, with a Peak-to-peak passband ripple of Rp dB and a stopband attenuation of Rs dB. + //Analog prototype for Cauer filter (Cauer filter and elliptic filters are same). + + //Calling Sequence + //[Zz, Zp, Zg] = ncauer(Rp, Rs, n) + + //Parameters + //n: Filter Order + //Rp: Peak-to-peak passband ripple in dB + //Rs: Stopband attenuation in dB + + //Description + //It gives an analog prototype for Cauer filter of nth order, with a Peak-to-peak passband ripple of Rp dB and a stopband attenuation of Rs dB. + + + //Examples + //n = 5; + //Rp = 5; + //Rs = 5; + //[Zz, Zp, Zg] = ncauer(Rp, Rs, n) + + //Zz = + // + // 0.0000 + 2.5546i 0.0000 + 1.6835i -0.0000 - 2.5546i -0.0000 - 1.6835i + // + //Zp = + // + // -0.10199 + 0.64039i -0.03168 + 0.96777i -0.10199 - 0.64039i -0.03168 - 0.96777i -0.14368 + 0.00000i + // + //Zg = 0.0030628 + // Dependencies + // ellipap + + funcprot(0); + lhs = argn(1) + rhs = argn(2) + if (rhs < 3 | rhs > 3) + error("ncauer : Wrong number of input arguments.") + end + + [Zz, Zp, Zg] = ellipap(n, Rp, Rs) ; + // temp fix to permanently fix this change ellipap + Zz = Zz'; + Zp = Zp'; + endfunction -//Examples -//n = 5; -//Rp = 5; -//Rs = 5; -//[Zz, Zp, Zg] = ncauer(Rp, Rs, n) +/* -//Zz = -// -// 0.0000 + 2.5546i 0.0000 + 1.6835i -0.0000 - 2.5546i -0.0000 - 1.6835i -// -//Zp = -// -// -0.10199 + 0.64039i -0.03168 + 0.96777i -0.10199 - 0.64039i -0.03168 - 0.96777i -0.14368 + 0.00000i -// -//Zg = 0.0030628 +// Test Case 1 (ncauer 0.1, 60, 7) +[z, p, g] = ncauer(0.1, 60, 7); +assert_checkalmostequal(z, [2.5574 1.5522 1.3295 -2.5574 -1.5522 -1.3295]*%i, 1e-2); +assert_checkalmostequal(p, [-0.3664+0.5837*%i -0.1802+0.9088*%i -0.0499+1.0285*%i -0.3664-0.5837*%i -0.1802-0.9088*%i -0.0499-1.0285*%i -0.4796], 1e-2); +assert_checkalmostequal(g, 7.4425e-03, 1e-2); +// Test Case 2 (ncauer 1.0, 30, 3) +[z, p, g] = ncauer(1.0, 30, 3); +assert_checkalmostequal(z, [1.9536 -1.9536]*%i, 1e-2); +assert_checkalmostequal(p, [-0.2053+0.9870*%i -0.2053-0.9870*%i -0.5597], 1e-2); +assert_checkalmostequal(g, 0.1490, 1e-2); -funcprot(0); -lhs = argn(1) -rhs = argn(2) -if (rhs < 3 | rhs > 3) -error("ncauer : Wrong number of input arguments.") -end +// Test Case 3 (ncauer 0.25, 50, 6) +[z, p, g] = ncauer(0.25, 50, 6); +assert_checkalmostequal(z, [4.0596 1.6414 1.3142 -4.0596 -1.6414 -1.3142]*%i, 1e-2); +assert_checkalmostequal(p, [-0.4210+0.3665*%i -0.2117+0.8503*%i -0.0550+1.0198*%i -0.4210-0.3665*%i -0.2117-0.8503*%i -0.0550-1.0198*%i], 1e-2); +assert_checkalmostequal(g, 3.1618e-03, 1e-2); -[Zz, Zp, Zg] = ellipap(n, Rp, Rs) ; +// Test Case 4 (ncauer 0.8, 45, 4) +[z, p, g] = ncauer(0.8, 45, 4); +assert_checkalmostequal(z, [4.1768 1.8543 -4.1768 -1.8543]*%i, 1e-2); +assert_checkalmostequal(p, [-0.3861+0.4640*%i -0.1234+1.0000*%i -0.3861-0.4640*%i -0.1234-1.0000*%i], 1e-2); +assert_checkalmostequal(g, 5.6237e-03, 1e-2); -endfunction +*/
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