| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * 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 |
| * |
| * http://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. |
| */ |
| |
| #ifndef __LVEQNB_TABLES_H__ |
| #define __LVEQNB_TABLES_H__ |
| |
| /************************************************************************************/ |
| /* */ |
| /* Sample rate table */ |
| /* */ |
| /************************************************************************************/ |
| |
| /* |
| * Sample rate table for converting between the enumerated type and the actual |
| * frequency |
| */ |
| #ifdef HIGHER_FS |
| extern const LVM_UINT32 LVEQNB_SampleRateTab[]; |
| #else |
| extern const LVM_UINT16 LVEQNB_SampleRateTab[]; |
| #endif |
| |
| /************************************************************************************/ |
| /* */ |
| /* Coefficient calculation tables */ |
| /* */ |
| /************************************************************************************/ |
| |
| /* |
| * Table for 2 * Pi / Fs |
| */ |
| extern const LVM_FLOAT LVEQNB_TwoPiOnFsTable[]; |
| |
| /* |
| * Gain table |
| */ |
| extern const LVM_FLOAT LVEQNB_GainTable[]; |
| |
| /* |
| * D table for 100 / (Gain + 1) |
| */ |
| extern const LVM_FLOAT LVEQNB_DTable[]; |
| |
| /************************************************************************************/ |
| /* */ |
| /* Filter polynomial coefficients */ |
| /* */ |
| /************************************************************************************/ |
| |
| /* |
| * Coefficients for calculating the cosine with the equation: |
| * |
| * Cos(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3 + a4*x^4 + a5*x^5) |
| * |
| * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting |
| * a range of 0 to Pi. The output is in the range 32767 to -32768 representing the range |
| * +1.0 to -1.0 |
| */ |
| extern const LVM_INT16 LVEQNB_CosCoef[]; |
| |
| /* |
| * Coefficients for calculating the cosine error with the equation: |
| * |
| * CosErr(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3) |
| * |
| * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting |
| * a range of 0 to Pi/25. The output is in the range 0 to 32767 representing the range |
| * 0.0 to 0.0078852986 |
| * |
| * This is used to give a double precision cosine over the range 0 to Pi/25 using the |
| * the equation: |
| * |
| * Cos(x) = 1.0 - CosErr(x) |
| */ |
| extern const LVM_INT16 LVEQNB_DPCosCoef[]; |
| |
| #endif /* __LVEQNB_TABLES_H__ */ |
