mirror of https://github.com/stella-emu/stella.git
37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2022 by Bradford W. Mott, Stephen Anthony
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// and the Stella Team
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//
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// See the file "License.txt" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//============================================================================
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#include "bspf.hxx"
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#include "HighPass.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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HighPass::HighPass(float cutOffFrequency, float frequency)
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: myAlpha{1.F / (1.F + 2.F*BSPF::PI_f*cutOffFrequency/frequency)}
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{
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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float HighPass::apply(float valueIn)
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{
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float valueOut = myAlpha * (myLastValueOut + valueIn - myLastValueIn);
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myLastValueIn = valueIn;
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myLastValueOut = valueOut;
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return valueOut;
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}
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