diff options
Diffstat (limited to 'midi-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_norm_init_f32.c')
-rw-r--r-- | midi-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_norm_init_f32.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/midi-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_norm_init_f32.c b/midi-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_norm_init_f32.c new file mode 100644 index 0000000..49272f8 --- /dev/null +++ b/midi-dials/Drivers/CMSIS/DSP/Source/FilteringFunctions/arm_lms_norm_init_f32.c @@ -0,0 +1,93 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_lms_norm_init_f32.c
+ * Description: Floating-point NLMS filter initialization function
+ *
+ * $Date: 27. January 2017
+ * $Revision: V.1.5.1
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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
+ *
+ * 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.
+ */
+
+#include "arm_math.h"
+
+/**
+ * @ingroup groupFilters
+ */
+
+/**
+ * @addtogroup LMS_NORM
+ * @{
+ */
+
+ /**
+ * @brief Initialization function for floating-point normalized LMS filter.
+ * @param[in] *S points to an instance of the floating-point LMS filter structure.
+ * @param[in] numTaps number of filter coefficients.
+ * @param[in] *pCoeffs points to coefficient buffer.
+ * @param[in] *pState points to state buffer.
+ * @param[in] mu step size that controls filter coefficient updates.
+ * @param[in] blockSize number of samples to process.
+ * @return none.
+ *
+ * \par Description:
+ * <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order:
+ * <pre>
+ * {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]}
+ * </pre>
+ * The initial filter coefficients serve as a starting point for the adaptive filter.
+ * <code>pState</code> points to an array of length <code>numTaps+blockSize-1</code> samples,
+ * where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_lms_norm_f32()</code>.
+ */
+
+void arm_lms_norm_init_f32(
+ arm_lms_norm_instance_f32 * S,
+ uint16_t numTaps,
+ float32_t * pCoeffs,
+ float32_t * pState,
+ float32_t mu,
+ uint32_t blockSize)
+{
+ /* Assign filter taps */
+ S->numTaps = numTaps;
+
+ /* Assign coefficient pointer */
+ S->pCoeffs = pCoeffs;
+
+ /* Clear state buffer and size is always blockSize + numTaps - 1 */
+ memset(pState, 0, (numTaps + (blockSize - 1U)) * sizeof(float32_t));
+
+ /* Assign state pointer */
+ S->pState = pState;
+
+ /* Assign Step size value */
+ S->mu = mu;
+
+ /* Initialise Energy to zero */
+ S->energy = 0.0f;
+
+ /* Initialise x0 to zero */
+ S->x0 = 0.0f;
+
+}
+
+/**
+ * @} end of LMS_NORM group
+ */
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