/**
 * @license
 * Copyright 2019 Google LLC. All Rights Reserved.
 * 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.
 * =============================================================================
 */
import { Tensor, Tensor1D } from '../tensor';
/**
 * Generate a Hann window.
 *
 * See: https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows
 *
 * ```js
 * tf.signal.hannWindow(10).print();
 * ```
 * @param The length of window
 */
/**
 * @doc {heading: 'Operations', subheading: 'Signal', namespace: 'signal'}
 */
declare function hannWindow_(windowLength: number): Tensor1D;
/**
 * Generate a hamming window.
 *
 * See: https://en.wikipedia.org/wiki/Window_function#Hann_and_Hamming_windows
 *
 * ```js
 * tf.signal.hammingWindow(10).print();
 * ```
 * @param The length of window
 */
/**
 * @doc {heading: 'Operations', subheading: 'Signal', namespace: 'signal'}
 */
declare function hammingWindow_(windowLength: number): Tensor1D;
/**
 * Expands input into frames of frameLength.
 * Slides a window size with frameStep.
 *
 * ```js
 * tf.signal.frame([1, 2, 3], 2, 1).print();
 * ```
 * @param signal The input tensor to be expanded
 * @param frameLength Length of each frame
 * @param frameStep The frame hop size in samples.
 */
/**
 * @doc {heading: 'Operations', subheading: 'Signal', namespace: 'signal'}
 */
declare function frame_(signal: Tensor1D, frameLength: number, frameStep: number, padEnd?: boolean, padValue?: number): Tensor;
export declare const hannWindow: typeof hannWindow_;
export declare const hammingWindow: typeof hammingWindow_;
export declare const frame: typeof frame_;
export {};