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* Copyright (c) 2024 EdgeImpulse Inc.
*
* Generated by Edge Impulse and licensed under the applicable Edge Impulse
* Terms of Service. Community and Professional Terms of Service
* (https://edgeimpulse.com/legal/terms-of-service) or Enterprise Terms of
* Service (https://edgeimpulse.com/legal/enterprise-terms-of-service),
* according to your product plan subscription (the “License”).
*
* This software, documentation and other associated files (collectively referred
* to as the “Software”) is a single SDK variation generated by the Edge Impulse
* platform and requires an active paid Edge Impulse subscription to use this
* Software for any purpose.
*
* You may NOT use this Software unless you have an active Edge Impulse subscription
* that meets the eligibility requirements for the applicable License, subject to
* your full and continued compliance with the terms and conditions of the License,
* including without limitation any usage restrictions under the applicable License.
*
* If you do not have an active Edge Impulse product plan subscription, or if use
* of this Software exceeds the usage limitations of your Edge Impulse product plan
* subscription, you are not permitted to use this Software and must immediately
* delete and erase all copies of this Software within your control or possession.
* Edge Impulse reserves all rights and remedies available to enforce its rights.
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* Unless required by applicable law or agreed to in writing, the Software 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, disclaimers and limitations under the License.
*/
#ifndef _EIDSP_SPEECHPY_FUNCTIONS_H_
#define _EIDSP_SPEECHPY_FUNCTIONS_H_
#include <math.h>
#include "../numpy.hpp"
#include "../returntypes.hpp"
namespace ei {
namespace speechpy {
class functions {
public:
/**
* Converting from frequency to Mel scale
*
* @param f The frequency values(or a single frequency) in Hz.
* @returns The mel scale values(or a single mel).
*/
static float frequency_to_mel(float f) {
#if EI_PORTING_RENESASRA65 == 1
return 1127.0 * log(1.0 + f / 700.0f);
#else
return 1127.0 * numpy::log((1.0 + f / 700.0f));
#endif
}
/**
* Converting from Mel scale to frequency.
*
* @param mel The mel scale values(or a single mel).
* @returns The frequency values(or a single frequency) in Hz.
*/
static float mel_to_frequency(float mel) {
return 700.0f * (exp(mel / 1127.0f) - 1.0f);
}
/**
* Triangle, linear scale from left up to middle, then down to right
* @param x Linspace output, will be overwritten!
* @param x_size Size of the linspace output
* @param left Starting index (assigned 0)
* @param middle Index where 1.0 will be placed
* @param right Ending index (assigned 0)
*/
static int triangle(float *x, size_t x_size, int left, int middle, int right) {
EI_DSP_MATRIX(out, 1, x_size);
for (size_t ix = 0; ix < x_size; ix++) {
if (x[ix] > left && x[ix] <= middle) {
out.buffer[ix] = (x[ix] - left) / (middle - left);
}
if (x[ix] < right && middle <= x[ix]) {
out.buffer[ix] = (right - x[ix]) / (right - middle);
}
}
memcpy(x, out.buffer, x_size * sizeof(float));
return EIDSP_OK;
}
};
} // namespace speechpy
} // namespace ei
#endif // _EIDSP_SPEECHPY_FUNCTIONS_H_
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