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chenyc

2025-02-12 ea42ff3ebee1eeb3fb29423aa848a249441db81c

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/**
 * @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 { tensor1d } from './tensor1d';
export function enclosingPowerOfTwo(value) {
    // Return 2**N for integer N such that 2**N >= value.
    return Math.floor(Math.pow(2, Math.ceil(Math.log(value) / Math.log(2.0))));
}
export function cosineWindow(windowLength, a, b) {
    const even = 1 - windowLength % 2;
    const newValues = new Float32Array(windowLength);
    for (let i = 0; i < windowLength; ++i) {
        const cosArg = (2.0 * Math.PI * i) / (windowLength + even - 1);
        newValues[i] = a - b * Math.cos(cosArg);
    }
    return tensor1d(newValues, 'float32');
}
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