FreeCalypso > hg > themwi-system-sw
diff mgw/dtmf_table.c @ 126:815e4c59162e
mgw DTMF: tone definitions and sample array generation
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 01 Oct 2022 17:09:51 -0800 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mgw/dtmf_table.c Sat Oct 01 17:09:51 2022 -0800 @@ -0,0 +1,37 @@ +/* + * This module holds the table of all possible DTMF tones we can generate. + */ + +#include <math.h> +#include <stdint.h> +#include "dtmf_defs.h" + +#define FREQ_697 (M_PI * 697.0 / 4000.0) +#define FREQ_770 (M_PI * 770.0 / 4000.0) +#define FREQ_852 (M_PI * 852.0 / 4000.0) +#define FREQ_941 (M_PI * 941.0 / 4000.0) +#define FREQ_1209 (M_PI * 1209.0 / 4000.0) +#define FREQ_1336 (M_PI * 1336.0 / 4000.0) +#define FREQ_1477 (M_PI * 1477.0 / 4000.0) +#define FREQ_1633 (M_PI * 1633.0 / 4000.0) + +struct dtmf_desc dtmf_table[] = { + {'1', FREQ_697, FREQ_1209}, + {'2', FREQ_697, FREQ_1336}, + {'3', FREQ_697, FREQ_1477}, + {'A', FREQ_697, FREQ_1633}, + {'4', FREQ_770, FREQ_1209}, + {'5', FREQ_770, FREQ_1336}, + {'6', FREQ_770, FREQ_1477}, + {'B', FREQ_770, FREQ_1633}, + {'7', FREQ_852, FREQ_1209}, + {'8', FREQ_852, FREQ_1336}, + {'9', FREQ_852, FREQ_1477}, + {'C', FREQ_852, FREQ_1633}, + {'*', FREQ_941, FREQ_1209}, + {'0', FREQ_941, FREQ_1336}, + {'#', FREQ_941, FREQ_1477}, + {'D', FREQ_941, FREQ_1633}, + /* table search terminator */ + {0, 0, 0} +};