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Remove the DC blocker from DMR.

boxcar
Jonathan Naylor 2017-07-31 21:54:26 +01:00
parent ba81fa7396
commit 669acb99e8
8 changed files with 99 additions and 50 deletions
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31
DStarRX.cpp
View File

@ -241,6 +241,10 @@ const uint16_t CCITT_TABLE[] = {
0xf78fU, 0xe606U, 0xd49dU, 0xc514U, 0xb1abU, 0xa022U, 0x92b9U, 0x8330U,
0x7bc7U, 0x6a4eU, 0x58d5U, 0x495cU, 0x3de3U, 0x2c6aU, 0x1ef1U, 0x0f78U};
// Generated using [b, a] = butter(1, 0.001) in MATLAB
static q31_t DC_FILTER[] = {3367972, 0, 3367972, 0, 2140747704, 0}; // {b0, 0, b1, b2, -a1, -a2}
const uint32_t DC_FILTER_STAGES = 1U; // One Biquad stage
CDStarRX::CDStarRX() :
m_pll(0U),
m_prev(false),
@ -257,8 +261,16 @@ m_pathMemory2(),
m_pathMemory3(),
m_fecOutput(),
m_rssiAccum(0U),
m_rssiCount(0U)
m_rssiCount(0U),
m_dcFilter(),
m_dcState()
{
::memset(m_dcState, 0x00U, 4U * sizeof(q31_t));
m_dcFilter.numStages = DC_FILTER_STAGES;
m_dcFilter.pState = m_dcState;
m_dcFilter.pCoeffs = DC_FILTER;
m_dcFilter.postShift = 0;
}
void CDStarRX::reset()
@ -273,13 +285,24 @@ void CDStarRX::reset()
m_rssiCount = 0U;
}
void CDStarRX::samples(const q15_t* samples, const uint16_t* rssi, uint8_t length)
{
void CDStarRX::samples(q15_t* samples, const uint16_t* rssi, uint8_t length)
{
q31_t dcLevel = 0;
q31_t dcVals[20U];
q31_t q31Samples[20U];
::arm_q15_to_q31(samples, q31Samples, length);
::arm_biquad_cascade_df1_q31(&m_dcFilter, q31Samples, dcVals, length);
for (uint8_t i = 0U; i < length; i++)
dcLevel += dcVals[i];
dcLevel /= length;
for (uint16_t i = 0U; i < length; i++) {
m_rssiAccum += rssi[i];
m_rssiCount++;
bool bit = samples[i] < 0;
bool bit = (q31Samples[i] - dcLevel) < 0;
if (bit != m_prev) {
if (m_pll < (PLLMAX / 2U))

4
DStarRX.h
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@ -32,7 +32,7 @@ class CDStarRX {
public:
CDStarRX();
void samples(const q15_t* samples, const uint16_t* rssi, uint8_t length);
void samples(q15_t* samples, const uint16_t* rssi, uint8_t length);
void reset();
@ -53,6 +53,8 @@ private:
uint8_t m_fecOutput[42U];
uint32_t m_rssiAccum;
uint16_t m_rssiCount;
arm_biquad_casd_df1_inst_q31 m_dcFilter;
q31_t m_dcState[4];
void processNone(bool bit);
void processHeader(bool bit);

30
IO.cpp
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@ -36,10 +36,6 @@ const uint16_t GAUSSIAN_0_5_FILTER_LEN = 12U;
static q15_t BOXCAR_FILTER[] = {12000, 12000, 12000, 12000, 12000, 0};
const uint16_t BOXCAR_FILTER_LEN = 6U;
// Generated using [b, a] = butter(1, 0.001) in MATLAB
static q31_t DC_FILTER[] = {3367972, 0, 3367972, 0, 2140747704, 0}; // {b0, 0, b1, b2, -a1, -a2}
const uint32_t DC_FILTER_STAGES = 1U; // One Biquad stage
const uint16_t DC_OFFSET = 2048U;
CIO::CIO() :
@ -66,14 +62,11 @@ m_detect(false),
m_adcOverflow(0U),
m_dacOverflow(0U),
m_watchdog(0U),
m_lockout(false),
m_dcFilter(),
m_dcState()
m_lockout(false)
{
::memset(m_rrcState, 0x00U, 70U * sizeof(q15_t));
::memset(m_gaussianState, 0x00U, 40U * sizeof(q15_t));
::memset(m_boxcarState, 0x00U, 30U * sizeof(q15_t));
::memset(m_dcState, 0x00U, 4U * sizeof(q31_t));
m_rrcFilter.numTaps = RRC_0_2_FILTER_LEN;
m_rrcFilter.pState = m_rrcState;
@ -87,11 +80,6 @@ m_dcState()
m_boxcarFilter.pState = m_boxcarState;
m_boxcarFilter.pCoeffs = BOXCAR_FILTER;
m_dcFilter.numStages = DC_FILTER_STAGES;
m_dcFilter.pState = m_dcState;
m_dcFilter.pCoeffs = DC_FILTER;
m_dcFilter.postShift = 0;
initInt();
}
@ -168,22 +156,6 @@ void CIO::process()
if (m_lockout)
return;
q31_t dcLevel = 0;
q31_t dcVals[20];
q31_t q31Samples[20U];
::arm_q15_to_q31(samples, q31Samples, RX_BLOCK_SIZE);
::arm_biquad_cascade_df1_q31(&m_dcFilter, q31Samples, dcVals, RX_BLOCK_SIZE);
for (uint8_t i = 0U; i < RX_BLOCK_SIZE; i++)
dcLevel += dcVals[i];
dcLevel /= RX_BLOCK_SIZE;
q15_t offset = q15_t(dcLevel >> 16);
for (uint8_t i = 0U; i < RX_BLOCK_SIZE; i++)
samples[i] -= offset;
if (m_modemState == STATE_IDLE) {
if (m_dstarEnable) {

14
IO.h
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@ -60,14 +60,12 @@ private:
CSampleRB m_txBuffer;
CRSSIRB m_rssiBuffer;
arm_fir_instance_q15 m_rrcFilter;
arm_fir_instance_q15 m_gaussianFilter;
arm_fir_instance_q15 m_boxcarFilter;
q15_t m_rrcState[70U]; // NoTaps + BlockSize - 1, 42 + 20 - 1 plus some spare
q15_t m_gaussianState[40U]; // NoTaps + BlockSize - 1, 12 + 20 - 1 plus some spare
q15_t m_boxcarState[30U]; // NoTaps + BlockSize - 1, 6 + 20 - 1 plus some spare
arm_biquad_casd_df1_inst_q31 m_dcFilter;
q31_t m_dcState[4];
arm_fir_instance_q15 m_rrcFilter;
arm_fir_instance_q15 m_gaussianFilter;
arm_fir_instance_q15 m_boxcarFilter;
q15_t m_rrcState[70U]; // NoTaps + BlockSize - 1, 42 + 20 - 1 plus some spare
q15_t m_gaussianState[40U]; // NoTaps + BlockSize - 1, 12 + 20 - 1 plus some spare
q15_t m_boxcarState[30U]; // NoTaps + BlockSize - 1, 6 + 20 - 1 plus some spare
bool m_pttInvert;
q15_t m_rxLevel;

31
P25RX.cpp
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@ -38,6 +38,10 @@ const uint16_t NOENDPTR = 9999U;
const unsigned int MAX_SYNC_FRAMES = 4U + 1U;
// Generated using [b, a] = butter(1, 0.001) in MATLAB
static q31_t DC_FILTER[] = {3367972, 0, 3367972, 0, 2140747704, 0}; // {b0, 0, b1, b2, -a1, -a2}
const uint32_t DC_FILTER_STAGES = 1U; // One Biquad stage
CP25RX::CP25RX() :
m_state(P25RXS_NONE),
m_bitBuffer(),
@ -60,8 +64,16 @@ m_threshold(),
m_thresholdVal(0),
m_averagePtr(NOAVEPTR),
m_rssiAccum(0U),
m_rssiCount(0U)
m_rssiCount(0U),
m_dcFilter(),
m_dcState()
{
::memset(m_dcState, 0x00U, 4U * sizeof(q31_t));
m_dcFilter.numStages = DC_FILTER_STAGES;
m_dcFilter.pState = m_dcState;
m_dcFilter.pCoeffs = DC_FILTER;
m_dcFilter.postShift = 0;
}
void CP25RX::reset()
@ -86,10 +98,23 @@ void CP25RX::reset()
m_rssiCount = 0U;
}
void CP25RX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
void CP25RX::samples(q15_t* samples, uint16_t* rssi, uint8_t length)
{
q31_t dcLevel = 0;
q31_t dcVals[20U];
q31_t q31Samples[20U];
::arm_q15_to_q31(samples, q31Samples, length);
::arm_biquad_cascade_df1_q31(&m_dcFilter, q31Samples, dcVals, length);
for (uint8_t i = 0U; i < length; i++)
dcLevel += dcVals[i];
dcLevel /= length;
q15_t offset = q15_t(__SSAT((dcLevel >> 16), 16));;
for (uint8_t i = 0U; i < length; i++) {
q15_t sample = samples[i];
q15_t sample = samples[i] - offset;
m_rssiAccum += rssi[i];
m_rssiCount++;

4
P25RX.h
View File

@ -32,7 +32,7 @@ class CP25RX {
public:
CP25RX();
void samples(const q15_t* samples, uint16_t* rssi, uint8_t length);
void samples(q15_t* samples, uint16_t* rssi, uint8_t length);
void reset();
@ -59,6 +59,8 @@ private:
uint8_t m_averagePtr;
uint32_t m_rssiAccum;
uint16_t m_rssiCount;
arm_biquad_casd_df1_inst_q31 m_dcFilter;
q31_t m_dcState[4];
void processNone(q15_t sample);
void processHdr(q15_t sample);

31
YSFRX.cpp
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@ -38,6 +38,10 @@ const uint16_t NOENDPTR = 9999U;
const unsigned int MAX_SYNC_FRAMES = 4U + 1U;
// Generated using [b, a] = butter(1, 0.001) in MATLAB
static q31_t DC_FILTER[] = {3367972, 0, 3367972, 0, 2140747704, 0}; // {b0, 0, b1, b2, -a1, -a2}
const uint32_t DC_FILTER_STAGES = 1U; // One Biquad stage
CYSFRX::CYSFRX() :
m_state(YSFRXS_NONE),
m_bitBuffer(),
@ -58,8 +62,16 @@ m_threshold(),
m_thresholdVal(0),
m_averagePtr(NOAVEPTR),
m_rssiAccum(0U),
m_rssiCount(0U)
m_rssiCount(0U),
m_dcFilter(),
m_dcState()
{
::memset(m_dcState, 0x00U, 4U * sizeof(q31_t));
m_dcFilter.numStages = DC_FILTER_STAGES;
m_dcFilter.pState = m_dcState;
m_dcFilter.pCoeffs = DC_FILTER;
m_dcFilter.postShift = 0;
}
void CYSFRX::reset()
@ -82,10 +94,23 @@ void CYSFRX::reset()
m_rssiCount = 0U;
}
void CYSFRX::samples(const q15_t* samples, uint16_t* rssi, uint8_t length)
void CYSFRX::samples(q15_t* samples, uint16_t* rssi, uint8_t length)
{
q31_t dcLevel = 0;
q31_t dcVals[20U];
q31_t q31Samples[20U];
::arm_q15_to_q31(samples, q31Samples, length);
::arm_biquad_cascade_df1_q31(&m_dcFilter, q31Samples, dcVals, length);
for (uint8_t i = 0U; i < length; i++)
dcLevel += dcVals[i];
dcLevel /= length;
q15_t offset = q15_t(__SSAT((dcLevel >> 16), 16));;
for (uint8_t i = 0U; i < length; i++) {
q15_t sample = samples[i];
q15_t sample = samples[i] - offset;
m_rssiAccum += rssi[i];
m_rssiCount++;

4
YSFRX.h
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@ -31,7 +31,7 @@ class CYSFRX {
public:
CYSFRX();
void samples(const q15_t* samples, uint16_t* rssi, uint8_t length);
void samples(q15_t* samples, uint16_t* rssi, uint8_t length);
void reset();
@ -56,6 +56,8 @@ private:
uint8_t m_averagePtr;
uint32_t m_rssiAccum;
uint16_t m_rssiCount;
arm_biquad_casd_df1_inst_q31 m_dcFilter;
q31_t m_dcState[4];
void processNone(q15_t sample);
void processData(q15_t sample);