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furrtek
2016-01-31 09:34:24 +01:00
parent 29ec87a9ad
commit 44638e504b
166 changed files with 8700 additions and 3967 deletions
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firmware/baseband/dsp_demodulate.hpp
+16 -19
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@@ -29,39 +29,36 @@ namespace demodulate {
class AM {
public:
buffer_s16_t execute(
buffer_c16_t src,
buffer_s16_t dst
buffer_f32_t execute(
const buffer_c16_t& src,
const buffer_f32_t& dst
);
};
class FM {
public:
/*
* angle: -pi to pi. output range: -32768 to 32767.
* Maximum delta-theta (output of atan2) at maximum deviation frequency:
* delta_theta_max = 2 * pi * deviation / sampling_rate
*/
constexpr FM(
const float sampling_rate,
const float deviation_hz
) : z_ { 0 },
k { static_cast<float>(32767.0f / (2.0 * pi * deviation_hz / sampling_rate)) }
{
}
buffer_f32_t execute(
const buffer_c16_t& src,
const buffer_f32_t& dst
);
buffer_s16_t execute(
buffer_c16_t src,
buffer_s16_t dst
const buffer_c16_t& src,
const buffer_s16_t& dst
);
void configure(const float sampling_rate, const float deviation_hz) {
/*
* angle: -pi to pi. output range: -32768 to 32767.
* Maximum delta-theta (output of atan2) at maximum deviation frequency:
* delta_theta_max = 2 * pi * deviation / sampling_rate
*/
k = static_cast<float>(32767.0f / (2.0 * pi * deviation_hz / sampling_rate));
}
private:
complex16_t::rep_type z_;
float k;
complex16_t::rep_type z_ { 0 };
float k { 0 };
};
} /* namespace demodulate */