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Prepare for SDR: Add bandwidth and deviation info to sender instance

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This commit is contained in:
Andreas Eversberg
2017-01-06 12:22:51 +01:00
parent 9ff8c3bb25
commit c5cf88ce57
10 changed files with 35 additions and 9 deletions
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10
src/anetz/dsp.c
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@@ -35,12 +35,10 @@
#define PI 3.1415927
/* signaling */
/* NOTE: The peak deviation is similar for paging tone and signaling tone,
* so both tones should be equal after pre-emphasis. This is why the paging
* tones is so much louder.*/
#define BANDWIDTH 15000.0 /* maximum bandwidth */
#define TX_PEAK_TONE 8192.0 /* peak amplitude for all tones */
#warning FIXME: only with emphasis, use seperate option for volume, override by sdr
#define TX_PEAK_PAGE 32766.0 /* peak amplitude paging tone */
// FIXME: what is the allowed deviation of tone?
#define CHUNK_DURATION 0.010 /* 10 ms */
// FIXME: how long until we detect a tone?
@@ -94,6 +92,10 @@ int dsp_init_sender(anetz_t *anetz, int page_sequence)
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Init DSP for 'Sender'.\n");
/* set deviation and modulation parameters */
anetz->sender.bandwidth = BANDWIDTH;
anetz->sender.sample_deviation = 11000.0 / (double)TX_PEAK_TONE;
anetz->page_sequence = page_sequence;
audio_init_loss(&anetz->sender.loss, LOSS_INTERVAL, anetz->sender.loss_volume, LOSS_TIME);