26 lines
896 B
C
26 lines
896 B
C
// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#define _USE_MATH_DEFINES
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#include "inc/dsps_wind_hann.h"
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#include <math.h>
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void dsps_wind_hann_f32(float *window, int len)
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{
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float len_mult = 1 / (float)(len - 1);
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for (int i = 0; i < len; i++) {
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window[i] = 0.5 * (1 - cosf(i * 2 * M_PI * len_mult));
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}
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}
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