1 | /**
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2 | * @license
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3 | * Copyright 2019 Google LLC. All Rights Reserved.
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | * =============================================================================
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16 | */
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17 | import { Tensor, Tensor1D } from '../../tensor';
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18 | /**
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19 | * Computes the Short-time Fourier Transform of signals
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20 | * See: https://en.wikipedia.org/wiki/Short-time_Fourier_transform
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21 | *
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22 | * ```js
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23 | * const input = tf.tensor1d([1, 1, 1, 1, 1])
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24 | * tf.signal.stft(input, 3, 1).print();
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25 | * ```
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26 | * @param signal 1-dimensional real value tensor.
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27 | * @param frameLength The window length of samples.
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28 | * @param frameStep The number of samples to step.
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29 | * @param fftLength The size of the FFT to apply.
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30 | * @param windowFn A callable that takes a window length and returns 1-d tensor.
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31 | *
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32 | * @doc {heading: 'Operations', subheading: 'Signal', namespace: 'signal'}
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33 | */
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34 | declare function stft_(signal: Tensor1D, frameLength: number, frameStep: number, fftLength?: number, windowFn?: (length: number) => Tensor1D): Tensor;
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35 | export declare const stft: typeof stft_;
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36 | export {};
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