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Add power control to AM (power on/off per sample)

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This commit is contained in:
Andreas Eversberg
2019-12-05 21:57:23 +01:00
parent 150a77b69d
commit 4af2dca10d
4 changed files with 10 additions and 8 deletions
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7
src/libam/am.c
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@@ -91,7 +91,7 @@ void am_mod_exit(am_mod_t __attribute__((unused)) *mod)
{
}
void am_modulate_complex(am_mod_t *mod, sample_t *amplitude, int num, float *baseband)
void am_modulate_complex(am_mod_t *mod, sample_t *amplitude, uint8_t *power, int num, float *baseband)
{
int s;
double vector;
@@ -101,7 +101,10 @@ void am_modulate_complex(am_mod_t *mod, sample_t *amplitude, int num, float *bas
double bias = mod->bias;
for (s = 0; s < num; s++) {
vector = *amplitude++ * gain + bias;
if (*power++)
vector = *amplitude++ * gain + bias;
else
vector = 0.0;
if (fast_math) {
*baseband++ += cos_tab[(uint16_t)phase] * vector;
*baseband++ += sin_tab[(uint16_t)phase] * vector;

2
src/libam/am.h
View File

@@ -12,7 +12,7 @@ typedef struct am_mod {
int am_mod_init(am_mod_t *mod, double samplerate, double offset, double gain, double bias);
void am_mod_exit(am_mod_t *mod);
void am_modulate_complex(am_mod_t *mod, sample_t *amplitude, int num, float *baseband);
void am_modulate_complex(am_mod_t *mod, sample_t *amplitude, uint8_t *power, int num, float *baseband);
typedef struct am_demod {
double rot; /* angle to rotate vector per sample */