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Decimators for wider IFIR output bandwidth.

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This commit is contained in:
Jared Boone
2016-01-02 10:34:17 -08:00
parent 096ebe47d8
commit a02bfe55d0
2 changed files with 177 additions and 0 deletions
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58
firmware/baseband/dsp_decimate.hpp
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@@ -92,6 +92,38 @@ private:
const std::array<int16_t, taps_count>& taps;
};
class FIRC8xR16x24FS4Decim4 {
public:
static constexpr size_t taps_count = 24;
static constexpr size_t decimation_factor = 4;
using sample_t = complex8_t;
using tap_t = int16_t;
enum class Shift : bool {
Down = true,
Up = false
};
FIRC8xR16x24FS4Decim4();
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale,
const Shift shift = Shift::Down
);
buffer_c16_t execute(
buffer_c8_t src,
buffer_c16_t dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_;
std::array<tap_t, taps_count> taps_;
int32_t output_scale = 0;
};
class FIRC8xR16x24FS4Decim8 {
public:
static constexpr size_t taps_count = 24;
@@ -124,6 +156,32 @@ private:
int32_t output_scale = 0;
};
class FIRC16xR16x16Decim2 {
public:
static constexpr size_t taps_count = 16;
static constexpr size_t decimation_factor = 2;
using sample_t = complex16_t;
using tap_t = int16_t;
FIRC16xR16x16Decim2();
void configure(
const std::array<tap_t, taps_count>& taps,
const int32_t scale
);
buffer_c16_t execute(
buffer_c16_t src,
buffer_c16_t dst
);
private:
std::array<vec2_s16, taps_count - decimation_factor> z_;
std::array<tap_t, taps_count> taps_;
int32_t output_scale = 0;
};
class FIRC16xR16x32Decim8 {
public:
static constexpr size_t taps_count = 32;