diff options
| author | Andreas Eversberg <jolly@eversberg.eu> | 2017-01-15 11:08:42 +0100 |
|---|---|---|
| committer | Andreas Eversberg <jolly@eversberg.eu> | 2017-02-18 21:01:04 +0100 |
| commit | ac0da3f76ee3f31599b0c572ed296b251e94378b (patch) | |
| tree | a1e3bfe7bedd349db38c11487023a57e5da1dfe0 /src/common/sdr.c | |
| parent | 799b96c801567c1cd0c6a1281511bca90eeac1db (diff) | |
Filter improvement: LP and HP filters, added test function
The -3 dB level at cut-off frequency is now maintained for multiple
iterations.
Diffstat (limited to 'src/common/sdr.c')
| -rw-r--r-- | src/common/sdr.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/common/sdr.c b/src/common/sdr.c index 2644968..db46906 100644 --- a/src/common/sdr.c +++ b/src/common/sdr.c @@ -39,7 +39,7 @@ typedef struct sdr_chan { double rx_rot; /* rotation step per sample to shift rx frequency (used to shift) */ double rx_phase; /* current rotation phase (used to shift) */ double rx_last_phase; /* last phase of FM (used to demodulate) */ - filter_lowpass_t rx_lp[2]; /* filters received IQ signal */ + filter_t rx_lp[2]; /* filters received IQ signal */ } sdr_chan_t; typedef struct sdr { @@ -123,8 +123,8 @@ void *sdr_open(const char __attribute__((__unused__)) *audiodev, double *tx_freq PDEBUG(DSDR, DEBUG_INFO, "Frequency #%d: TX = %.6f MHz, RX = %.6f MHz\n", c, tx_frequency[c] / 1e6, rx_frequency[c] / 1e6); sdr->chan[c].tx_frequency = tx_frequency[c]; sdr->chan[c].rx_frequency = rx_frequency[c]; - filter_lowpass_init(&sdr->chan[c].rx_lp[0], bandwidth, samplerate); - filter_lowpass_init(&sdr->chan[c].rx_lp[1], bandwidth, samplerate); + filter_lowpass_init(&sdr->chan[c].rx_lp[0], bandwidth, samplerate, 1); + filter_lowpass_init(&sdr->chan[c].rx_lp[1], bandwidth, samplerate, 1); } if (sdr->paging_channel) { PDEBUG(DSDR, DEBUG_INFO, "Paging Frequency: TX = %.6f MHz\n", paging_frequency / 1e6); @@ -378,8 +378,8 @@ int sdr_read(void *inst, int16_t **samples, int num, int channels) Q[s] = i * sin(phase) + q * cos(phase); } sdr->chan[c].rx_phase = phase; - filter_lowpass_process(&sdr->chan[c].rx_lp[0], I, count, 1); - filter_lowpass_process(&sdr->chan[c].rx_lp[1], Q, count, 1); + filter_process(&sdr->chan[c].rx_lp[0], I, count); + filter_process(&sdr->chan[c].rx_lp[1], Q, count); last_phase = sdr->chan[c].rx_last_phase; for (s = 0; s < count; s++) { phase = atan2(Q[s], I[s]); |