diff options
Diffstat (limited to 'extern/audaspace/src/fx/HighpassCalculator.cpp')
| -rw-r--r-- | extern/audaspace/src/fx/HighpassCalculator.cpp | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/extern/audaspace/src/fx/HighpassCalculator.cpp b/extern/audaspace/src/fx/HighpassCalculator.cpp new file mode 100644 index 00000000000..2b69efe2fa7 --- /dev/null +++ b/extern/audaspace/src/fx/HighpassCalculator.cpp @@ -0,0 +1,43 @@ +/******************************************************************************* + * Copyright 2009-2016 Jörg Müller + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + ******************************************************************************/ + +#include "fx/HighpassCalculator.h" + +#include <cmath> + +AUD_NAMESPACE_BEGIN + +HighpassCalculator::HighpassCalculator(float frequency, float Q) : + m_frequency(frequency), + m_Q(Q) +{ +} + +void HighpassCalculator::recalculateCoefficients(SampleRate rate, std::vector<float> &b, std::vector<float> &a) +{ + float w0 = 2.0 * M_PI * (SampleRate)m_frequency / rate; + float alpha = (float)(std::sin(w0) / (2.0 * (double)m_Q)); + float norm = 1 + alpha; + float c = std::cos(w0); + a.push_back(1); + a.push_back(-2 * c / norm); + a.push_back((1 - alpha) / norm); + b.push_back((1 + c) / (2 * norm)); + b.push_back((-1 - c) / norm); + b.push_back(b[0]); +} + +AUD_NAMESPACE_END |