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39 lines
1.5 KiB
39 lines
1.5 KiB
/**
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* Copyright (c) 2022 Xiaomi Corporation (authors: Fangjun Kuang)
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*
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* See LICENSE for clarification regarding multiple authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// This file is copied/modified from kaldi/src/feat/feature-functions.h
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#ifndef KALDI_NATIVE_FBANK_CSRC_FEATURE_FUNCTIONS_H
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#define KALDI_NATIVE_FBANK_CSRC_FEATURE_FUNCTIONS_H
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#include <vector>
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namespace knf {
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// ComputePowerSpectrum converts a complex FFT (as produced by the FFT
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// functions in csrc/rfft.h), and converts it into
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// a power spectrum. If the complex FFT is a vector of size n (representing
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// half of the complex FFT of a real signal of size n, as described there),
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// this function computes in the first (n/2) + 1 elements of it, the
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// energies of the fft bins from zero to the Nyquist frequency. Contents of the
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// remaining (n/2) - 1 elements are undefined at output.
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void ComputePowerSpectrum(std::vector<float> *complex_fft);
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} // namespace knf
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#endif // KALDI_NATIVE_FBANK_CSRC_FEATURE_FUNCTIONS_H
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