29 lines
1.1 KiB
C
29 lines
1.1 KiB
C
#include "../libfilter/iir_filter.h"
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int am_init(int fast_math);
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void am_exit(void);
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typedef struct am_mod {
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double rot; /* angle to rotate vector per sample */
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double phase; /* current phase */
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double gain; /* gain to be multiplied to amplitude */
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double bias; /* DC offset to add (carrier amplitude) */
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} am_mod_t;
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int am_mod_init(am_mod_t *mod, double samplerate, double offset, double gain, double bias);
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void am_mod_exit(am_mod_t *mod);
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void am_modulate_complex(am_mod_t *mod, sample_t *amplitude, int num, float *baseband);
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typedef struct am_demod {
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double rot; /* angle to rotate vector per sample */
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double phase; /* current rotation phase (used to shift) */
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iir_filter_t lp[3]; /* filters received IQ signal/carrier */
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double gain; /* gain to be expected from amplitude */
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double bias; /* DC offset to be expected (carrier amplitude) */
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} am_demod_t;
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int am_demod_init(am_demod_t *demod, double samplerate, double offset, double gain, double bias);
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void am_demod_exit(am_demod_t *demod);
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void am_demodulate_complex(am_demod_t *demod, sample_t *amplitude, int length, float *baseband, sample_t *I, sample_t *Q, sample_t *carrier);
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