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attenuator.cc

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// attenuator.cc
// SuperMix version 1.0  C++ source file
//
// Copyright (c) 1999 California Institute of Technology.
// All rights reserved.
//
// Redistribution and use in source and binary forms for noncommercial
// purposes are permitted provided that the above copyright notice and
// this paragraph are duplicated in all such forms and that any
// documentation and other materials related to such distribution and
// use acknowledge that the software was developed by California
// Institute of Technology. Redistribution and/or use in source or
// binary forms is not permitted for any commercial purpose. Use of
// this software does not include a permitted use of the Institute's
// name or trademark for any purpose.
//
// DISCLAIMER:
// THIS SOFTWARE AND/OR RELATED MATERIALS ARE PROVIDED "AS-IS" WITHOUT
// WARRANTY OF ANY KIND INCLUDING ANY WARRANTIES OF PERFORMANCE OR
// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE (AS SET
// FORTH IN UCC 23212-2313) OR FOR ANY PURPOSE WHATSOEVER, FOR THE
// LICENSED PRODUCT, HOWEVER USED.  IN NO EVENT SHALL CALTECH/JPL BE
// LIABLE FOR ANY DAMAGES AND/OR COSTS, INCLUDING BUT NOT LIMITED TO
// INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND, INCLUDING ECONOMIC
// DAMAGE OR INJURY TO PROPERTY AND LOST PROFITS, REGARDLESS OF
// WHETHER CALTECH/JPL SHALL BE ADVISED, HAVE REASON TO KNOW, OR IN
// FACT SHALL KNOW OF THE POSSIBILITY.  THE USER BEARS ALL RISK
// RELATING TO QUALITY AND PERFORMANCE OF THE SOFTWARE AND/OR RELATED
// MATERIALS.
//
// Change history:
// 10/29/99: recalc() now sets normalization impedance
// 11/23/98: Fixed arguments in call to compute_passive_noise
// 11/11/98: Changed table access to new syntax

#include "attenuator.h"
#include <math.h>

attenuator::attenuator(double a) : nport(2), dB(a), Temp(&T)
{ info.source = false; }

attenuator::attenuator(const abstract_real_parameter * a)
 : nport(2), dB(a), Temp(&T)
{ info.source = false; }

void attenuator::recalc_S()
{
  // set the normalizing impedance
  data.set_znorm(device::Z0);

  // Perfect input matches.
  data.S[1][1] = 0.0;
  data.S[2][2] = 0.0;

  // Attenuated transmission.
  double atten = pow(10, -0.05 * dB);
  data.S[1][2] = atten;
  data.S[2][1] = atten;

  // Assume source vector, B, is already 0.
}

void attenuator::recalc()
{
  recalc_S();

  // Calculate the noise correlation matrix, C.
  compute_passive_noise(data, f, Temp);
}

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