1 /* 2 * Copyright (C) 2004-2010 NXP Software 3 * Copyright (C) 2010 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 #ifndef _FILTER_H_ 19 #define _FILTER_H_ 20 21 #ifdef __cplusplus 22 extern "C" { 23 #endif /* __cplusplus */ 24 25 /********************************************************************************** 26 INCLUDES 27 ***********************************************************************************/ 28 #include "LVM_Types.h" 29 #include "BIQUAD.h" 30 31 32 /********************************************************************************** 33 DEFINES 34 ***********************************************************************************/ 35 #define FILTER_LOSS 32730 /* -0.01dB loss to avoid wrapping due to band ripple */ 36 37 /********************************************************************************** 38 FUNCTION PROTOTYPES 39 ***********************************************************************************/ 40 41 LVM_INT32 LVM_Polynomial(LVM_UINT16 N, 42 LVM_INT32 *pCoefficients, 43 LVM_INT32 X); 44 45 LVM_INT32 LVM_Power10( LVM_INT32 X); 46 47 LVM_INT32 LVM_FO_LPF( LVM_INT32 w, 48 FO_C32_Coefs_t *pCoeffs); 49 50 LVM_INT32 LVM_FO_HPF( LVM_INT32 w, 51 FO_C32_Coefs_t *pCoeffs); 52 53 LVM_INT32 LVM_GetOmega(LVM_UINT16 Fc, 54 LVM_Fs_en SampleRate); 55 56 /**********************************************************************************/ 57 #ifdef __cplusplus 58 } 59 #endif /* __cplusplus */ 60 61 #endif /** _FILTER_H_ **/ 62 63
