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mel_cepstrum_postfiltering.cc
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mel_cepstrum_postfiltering.cc
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// ----------------------------------------------------------------- //
// The Speech Signal Processing Toolkit (SPTK) //
// developed by SPTK Working Group //
// http://sp-tk.sourceforge.net/ //
// ----------------------------------------------------------------- //
// //
// Copyright (c) 1984-2007 Tokyo Institute of Technology //
// Interdisciplinary Graduate School of //
// Science and Engineering //
// //
// 1996-2021 Nagoya Institute of Technology //
// Department of Computer Science //
// //
// All rights reserved. //
// //
// Redistribution and use in source and binary forms, with or //
// without modification, are permitted provided that the following //
// conditions are met: //
// //
// - Redistributions of source code must retain the above copyright //
// notice, this list of conditions and the following disclaimer. //
// - Redistributions in binary form must reproduce the above //
// copyright notice, this list of conditions and the following //
// disclaimer in the documentation and/or other materials provided //
// with the distribution. //
// - Neither the name of the SPTK working group nor the names of its //
// contributors may be used to endorse or promote products derived //
// from this software without specific prior written permission. //
// //
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND //
// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, //
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF //
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE //
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS //
// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, //
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED //
// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, //
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON //
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, //
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY //
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE //
// POSSIBILITY OF SUCH DAMAGE. //
// ----------------------------------------------------------------- //
#include "SPTK/utils/mel_cepstrum_postfiltering.h"
#include <algorithm> // std::copy, std::transform
#include <cmath> // std::log
#include <cstddef> // std::size_t
namespace sptk {
MelCepstrumPostfiltering::MelCepstrumPostfiltering(int num_order,
int num_cepstrum_order,
int impulse_response_length,
int onset_index,
double alpha, double beta)
: onset_index_(onset_index),
beta_(beta),
frequency_transform_(num_order, num_cepstrum_order, -alpha),
cepstrum_to_autocorrelation_(num_cepstrum_order, 0,
impulse_response_length),
mel_cepstrum_to_mlsa_digital_filter_coefficients_(num_order, alpha),
mlsa_digital_filter_coefficients_to_mel_cepstrum_(num_order, alpha),
is_valid_(true) {
if (!IsInRange(num_cepstrum_order, num_order, impulse_response_length - 1) ||
!IsInRange(onset_index_, 0, num_order) ||
!frequency_transform_.IsValid() ||
!cepstrum_to_autocorrelation_.IsValid() ||
!mel_cepstrum_to_mlsa_digital_filter_coefficients_.IsValid() ||
!mlsa_digital_filter_coefficients_to_mel_cepstrum_.IsValid()) {
is_valid_ = false;
return;
}
}
bool MelCepstrumPostfiltering::Run(
const std::vector<double>& mel_cepstrum,
std::vector<double>* postfiltered_mel_cepstrum,
MelCepstrumPostfiltering::Buffer* buffer) const {
// Check inputs.
const int length(GetNumOrder() + 1);
if (!is_valid_ || mel_cepstrum.size() != static_cast<std::size_t>(length) ||
NULL == postfiltered_mel_cepstrum || NULL == buffer) {
return false;
}
// Prepare memories.
if (postfiltered_mel_cepstrum->size() != static_cast<std::size_t>(length)) {
postfiltered_mel_cepstrum->resize(length);
}
if (buffer->mel_cepstrum_.size() != static_cast<std::size_t>(length)) {
buffer->mel_cepstrum_.resize(length);
}
// Handle special case.
if (0.0 == beta_) {
std::copy(mel_cepstrum.begin(), mel_cepstrum.end(),
postfiltered_mel_cepstrum->begin());
return true;
}
// Calculate energy of original mel-cepstrum.
{
if (!frequency_transform_.Run(mel_cepstrum, &buffer->cepstrum_,
&buffer->buffer_for_frequency_transform_)) {
return false;
}
if (!cepstrum_to_autocorrelation_.Run(
buffer->cepstrum_, &buffer->autocorrelation_,
&buffer->buffer_for_cepstrum_to_autocorrelation_)) {
return false;
}
}
const double original_energy(buffer->autocorrelation_[0]);
// Calculate energy of modified mel-cepstrum.
{
std::copy(mel_cepstrum.begin(), mel_cepstrum.begin() + onset_index_,
buffer->mel_cepstrum_.begin());
const double weight(1.0 + beta_);
std::transform(mel_cepstrum.begin() + onset_index_, mel_cepstrum.end(),
buffer->mel_cepstrum_.begin() + onset_index_,
[weight](double c) { return c * weight; });
if (!frequency_transform_.Run(buffer->mel_cepstrum_, &buffer->cepstrum_,
&buffer->buffer_for_frequency_transform_)) {
return false;
}
if (!cepstrum_to_autocorrelation_.Run(
buffer->cepstrum_, &buffer->autocorrelation_,
&buffer->buffer_for_cepstrum_to_autocorrelation_)) {
return false;
}
}
const double modified_energy(buffer->autocorrelation_[0]);
// Adjust gain.
{
if (!mel_cepstrum_to_mlsa_digital_filter_coefficients_.Run(
buffer->mel_cepstrum_,
&buffer->mlsa_digital_filter_coefficients_)) {
return false;
}
buffer->mlsa_digital_filter_coefficients_[0] +=
(0.5 * std::log(original_energy / modified_energy));
if (!mlsa_digital_filter_coefficients_to_mel_cepstrum_.Run(
buffer->mlsa_digital_filter_coefficients_,
postfiltered_mel_cepstrum)) {
return false;
}
}
return true;
}
bool MelCepstrumPostfiltering::Run(
std::vector<double>* input_and_output,
MelCepstrumPostfiltering::Buffer* buffer) const {
if (NULL == input_and_output) return false;
return Run(*input_and_output, input_and_output, buffer);
}
} // namespace sptk