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Diffstat (limited to '')
| -rw-r--r-- | src/goertzel.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/goertzel.h b/src/goertzel.h new file mode 100644 index 0000000..ad1e4b8 --- /dev/null +++ b/src/goertzel.h @@ -0,0 +1,34 @@ +/** + * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <stddef.h> +#include <stdint.h> + + + +struct goertzel_state +{ + double prev1; + double prev2; + double power; + size_t n; + double k; +}; + + +void goertzel_init(double freq, double rate, struct goertzel_state* restrict state); +double goertzel(size_t n, const uint32_t* restrict samples, struct goertzel_state* restrict state); + |