1 /****************************************************************************** 2 * @file filtering_functions_f16.h 3 * @brief Public header file for CMSIS DSP Library 4 * @version V1.10.0 5 * @date 08 July 2021 6 * Target Processor: Cortex-M and Cortex-A cores 7 ******************************************************************************/ 8 /* 9 * Copyright (c) 2010-2020 Arm Limited or its affiliates. All rights reserved. 10 * 11 * SPDX-License-Identifier: Apache-2.0 12 * 13 * Licensed under the Apache License, Version 2.0 (the License); you may 14 * not use this file except in compliance with the License. 15 * You may obtain a copy of the License at 16 * 17 * www.apache.org/licenses/LICENSE-2.0 18 * 19 * Unless required by applicable law or agreed to in writing, software 20 * distributed under the License is distributed on an AS IS BASIS, WITHOUT 21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 22 * See the License for the specific language governing permissions and 23 * limitations under the License. 24 */ 25 26 27 #ifndef FILTERING_FUNCTIONS_F16_H_ 28 #define FILTERING_FUNCTIONS_F16_H_ 29 30 #include "arm_math_types_f16.h" 31 #include "arm_math_memory.h" 32 33 #include "dsp/none.h" 34 #include "dsp/utils.h" 35 36 37 #ifdef __cplusplus 38 extern "C" 39 { 40 #endif 41 42 #if defined(ARM_FLOAT16_SUPPORTED) 43 44 /** 45 * @brief Instance structure for the floating-point FIR filter. 46 */ 47 typedef struct 48 { 49 uint16_t numTaps; /**< number of filter coefficients in the filter. */ 50 float16_t *pState; /**< points to the state variable array. The array is of length numTaps+blockSize-1. */ 51 const float16_t *pCoeffs; /**< points to the coefficient array. The array is of length numTaps. */ 52 } arm_fir_instance_f16; 53 54 /** 55 * @brief Initialization function for the floating-point FIR filter. 56 * @param[in,out] S points to an instance of the floating-point FIR filter structure. 57 * @param[in] numTaps Number of filter coefficients in the filter. 58 * @param[in] pCoeffs points to the filter coefficients. 59 * @param[in] pState points to the state buffer. 60 * @param[in] blockSize number of samples that are processed at a time. 61 */ 62 void arm_fir_init_f16( 63 arm_fir_instance_f16 * S, 64 uint16_t numTaps, 65 const float16_t * pCoeffs, 66 float16_t * pState, 67 uint32_t blockSize); 68 69 /** 70 * @brief Processing function for the floating-point FIR filter. 71 * @param[in] S points to an instance of the floating-point FIR structure. 72 * @param[in] pSrc points to the block of input data. 73 * @param[out] pDst points to the block of output data. 74 * @param[in] blockSize number of samples to process. 75 */ 76 void arm_fir_f16( 77 const arm_fir_instance_f16 * S, 78 const float16_t * pSrc, 79 float16_t * pDst, 80 uint32_t blockSize); 81 82 83 /** 84 * @brief Instance structure for the floating-point Biquad cascade filter. 85 */ 86 typedef struct 87 { 88 uint32_t numStages; /**< number of 2nd order stages in the filter. Overall order is 2*numStages. */ 89 float16_t *pState; /**< Points to the array of state coefficients. The array is of length 4*numStages. */ 90 const float16_t *pCoeffs; /**< Points to the array of coefficients. The array is of length 5*numStages. */ 91 } arm_biquad_casd_df1_inst_f16; 92 93 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) 94 /** 95 * @brief Instance structure for the modified Biquad coefs required by vectorized code. 96 */ 97 typedef struct 98 { 99 float16_t coeffs[12][8]; /**< Points to the array of modified coefficients. The array is of length 32. There is one per stage */ 100 } arm_biquad_mod_coef_f16; 101 #endif 102 103 /** 104 * @brief Processing function for the floating-point Biquad cascade filter. 105 * @param[in] S points to an instance of the floating-point Biquad cascade structure. 106 * @param[in] pSrc points to the block of input data. 107 * @param[out] pDst points to the block of output data. 108 * @param[in] blockSize number of samples to process. 109 */ 110 void arm_biquad_cascade_df1_f16( 111 const arm_biquad_casd_df1_inst_f16 * S, 112 const float16_t * pSrc, 113 float16_t * pDst, 114 uint32_t blockSize); 115 116 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) 117 void arm_biquad_cascade_df1_mve_init_f16( 118 arm_biquad_casd_df1_inst_f16 * S, 119 uint8_t numStages, 120 const float16_t * pCoeffs, 121 arm_biquad_mod_coef_f16 * pCoeffsMod, 122 float16_t * pState); 123 #endif 124 125 void arm_biquad_cascade_df1_init_f16( 126 arm_biquad_casd_df1_inst_f16 * S, 127 uint8_t numStages, 128 const float16_t * pCoeffs, 129 float16_t * pState); 130 131 /** 132 * @brief Instance structure for the floating-point transposed direct form II Biquad cascade filter. 133 */ 134 typedef struct 135 { 136 uint8_t numStages; /**< number of 2nd order stages in the filter. Overall order is 2*numStages. */ 137 float16_t *pState; /**< points to the array of state coefficients. The array is of length 2*numStages. */ 138 const float16_t *pCoeffs; /**< points to the array of coefficients. The array is of length 5*numStages. */ 139 } arm_biquad_cascade_df2T_instance_f16; 140 141 /** 142 * @brief Instance structure for the floating-point transposed direct form II Biquad cascade filter. 143 */ 144 typedef struct 145 { 146 uint8_t numStages; /**< number of 2nd order stages in the filter. Overall order is 2*numStages. */ 147 float16_t *pState; /**< points to the array of state coefficients. The array is of length 4*numStages. */ 148 const float16_t *pCoeffs; /**< points to the array of coefficients. The array is of length 5*numStages. */ 149 } arm_biquad_cascade_stereo_df2T_instance_f16; 150 151 /** 152 * @brief Processing function for the floating-point transposed direct form II Biquad cascade filter. 153 * @param[in] S points to an instance of the filter data structure. 154 * @param[in] pSrc points to the block of input data. 155 * @param[out] pDst points to the block of output data 156 * @param[in] blockSize number of samples to process. 157 */ 158 void arm_biquad_cascade_df2T_f16( 159 const arm_biquad_cascade_df2T_instance_f16 * S, 160 const float16_t * pSrc, 161 float16_t * pDst, 162 uint32_t blockSize); 163 164 /** 165 * @brief Processing function for the floating-point transposed direct form II Biquad cascade filter. 2 channels 166 * @param[in] S points to an instance of the filter data structure. 167 * @param[in] pSrc points to the block of input data. 168 * @param[out] pDst points to the block of output data 169 * @param[in] blockSize number of samples to process. 170 */ 171 void arm_biquad_cascade_stereo_df2T_f16( 172 const arm_biquad_cascade_stereo_df2T_instance_f16 * S, 173 const float16_t * pSrc, 174 float16_t * pDst, 175 uint32_t blockSize); 176 177 /** 178 * @brief Initialization function for the floating-point transposed direct form II Biquad cascade filter. 179 * @param[in,out] S points to an instance of the filter data structure. 180 * @param[in] numStages number of 2nd order stages in the filter. 181 * @param[in] pCoeffs points to the filter coefficients. 182 * @param[in] pState points to the state buffer. 183 */ 184 void arm_biquad_cascade_df2T_init_f16( 185 arm_biquad_cascade_df2T_instance_f16 * S, 186 uint8_t numStages, 187 const float16_t * pCoeffs, 188 float16_t * pState); 189 190 /** 191 * @brief Initialization function for the floating-point transposed direct form II Biquad cascade filter. 192 * @param[in,out] S points to an instance of the filter data structure. 193 * @param[in] numStages number of 2nd order stages in the filter. 194 * @param[in] pCoeffs points to the filter coefficients. 195 * @param[in] pState points to the state buffer. 196 */ 197 void arm_biquad_cascade_stereo_df2T_init_f16( 198 arm_biquad_cascade_stereo_df2T_instance_f16 * S, 199 uint8_t numStages, 200 const float16_t * pCoeffs, 201 float16_t * pState); 202 203 /** 204 * @brief Correlation of floating-point sequences. 205 * @param[in] pSrcA points to the first input sequence. 206 * @param[in] srcALen length of the first input sequence. 207 * @param[in] pSrcB points to the second input sequence. 208 * @param[in] srcBLen length of the second input sequence. 209 * @param[out] pDst points to the block of output data Length 2 * max(srcALen, srcBLen) - 1. 210 */ 211 void arm_correlate_f16( 212 const float16_t * pSrcA, 213 uint32_t srcALen, 214 const float16_t * pSrcB, 215 uint32_t srcBLen, 216 float16_t * pDst); 217 218 219 /** 220 @brief Levinson Durbin 221 @param[in] phi autocovariance vector starting with lag 0 (length is nbCoefs + 1) 222 @param[out] a autoregressive coefficients 223 @param[out] err prediction error (variance) 224 @param[in] nbCoefs number of autoregressive coefficients 225 */ 226 void arm_levinson_durbin_f16(const float16_t *phi, 227 float16_t *a, 228 float16_t *err, 229 int nbCoefs); 230 231 #endif /*defined(ARM_FLOAT16_SUPPORTED)*/ 232 #ifdef __cplusplus 233 } 234 #endif 235 236 #endif /* ifndef _FILTERING_FUNCTIONS_F16_H_ */ 237
