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Diffstat (limited to 'source/use_case/kws_asr/include/Wav2LetterMfcc.hpp')
| -rw-r--r-- | source/use_case/kws_asr/include/Wav2LetterMfcc.hpp | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/source/use_case/kws_asr/include/Wav2LetterMfcc.hpp b/source/use_case/kws_asr/include/Wav2LetterMfcc.hpp deleted file mode 100644 index 75d75da..0000000 --- a/source/use_case/kws_asr/include/Wav2LetterMfcc.hpp +++ /dev/null @@ -1,113 +0,0 @@ -/* - * Copyright (c) 2021 Arm Limited. All rights reserved. - * SPDX-License-Identifier: Apache-2.0 - * - * 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. - */ -#ifndef KWS_ASR_WAV2LET_MFCC_HPP -#define KWS_ASR_WAV2LET_MFCC_HPP - -#include "Mfcc.hpp" - -namespace arm { -namespace app { -namespace audio { - - /* Class to provide Wav2Letter specific MFCC calculation requirements. */ - class Wav2LetterMFCC : public MFCC { - - public: - static constexpr uint32_t ms_defaultSamplingFreq = 16000; - static constexpr uint32_t ms_defaultNumFbankBins = 128; - static constexpr uint32_t ms_defaultMelLoFreq = 0; - static constexpr uint32_t ms_defaultMelHiFreq = 8000; - static constexpr bool ms_defaultUseHtkMethod = false; - - explicit Wav2LetterMFCC(const size_t numFeats, const size_t frameLen) - : MFCC(MfccParams( - ms_defaultSamplingFreq, ms_defaultNumFbankBins, - ms_defaultMelLoFreq, ms_defaultMelHiFreq, - numFeats, frameLen, ms_defaultUseHtkMethod)) - {} - - Wav2LetterMFCC() = delete; - ~Wav2LetterMFCC() = default; - - protected: - - /** - * @brief Overrides base class implementation of this function. - * @param[in] fftVec Vector populated with FFT magnitudes. - * @param[in] melFilterBank 2D Vector with filter bank weights. - * @param[in] filterBankFilterFirst Vector containing the first indices of filter bank - * to be used for each bin. - * @param[in] filterBankFilterLast Vector containing the last indices of filter bank - * to be used for each bin. - * @param[out] melEnergies Pre-allocated vector of MEL energies to be - * populated. - * @return true if successful, false otherwise. - */ - bool ApplyMelFilterBank( - std::vector<float>& fftVec, - std::vector<std::vector<float>>& melFilterBank, - std::vector<uint32_t>& filterBankFilterFirst, - std::vector<uint32_t>& filterBankFilterLast, - std::vector<float>& melEnergies) override; - - /** - * @brief Override for the base class implementation convert mel - * energies to logarithmic scale. The difference from - * default behaviour is that the power is converted to dB - * and subsequently clamped. - * @param[in,out] melEnergies 1D vector of Mel energies. - **/ - void ConvertToLogarithmicScale( - std::vector<float>& melEnergies) override; - - /** - * @brief Create a matrix used to calculate Discrete Cosine - * Transform. Override for the base class' default - * implementation as the first and last elements - * use a different normaliser. - * @param[in] inputLength Input length of the buffer on which - * DCT will be performed. - * @param[in] coefficientCount Total coefficients per input length. - * @return 1D vector with inputLength x coefficientCount elements - * populated with DCT coefficients. - */ - std::vector<float> CreateDCTMatrix( - int32_t inputLength, - int32_t coefficientCount) override; - - /** - * @brief Given the low and high Mel values, get the normaliser - * for weights to be applied when populating the filter - * bank. Override for the base class implementation. - * @param[in] leftMel Low Mel frequency value. - * @param[in] rightMel High Mel frequency value. - * @param[in] useHTKMethod Bool to signal if HTK method is to be - * used for calculation. - * @return Value to use for normalising. - */ - float GetMelFilterBankNormaliser( - const float& leftMel, - const float& rightMel, - bool useHTKMethod) override; - - }; - -} /* namespace audio */ -} /* namespace app */ -} /* namespace arm */ - -#endif /* KWS_ASR_WAV2LET_MFCC_HPP */ |