williamp/osmocom-analog
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

common: Add pre and de emphasis, if the radio does not support it

Browse Source 
Connect to the oscillator of the transmitter - good girl!
You need to enable pre emphasis in this case.

Connect to the discriminator of the receiver - good boy!
You need to enable de emphasis in this case.
This commit is contained in:
Andreas Eversberg
2016-04-23 18:50:11 +02:00
parent 5062628e52
commit 4356c93afa
20 changed files with 256 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/common/sender.h
View File

@@ -3,6 +3,7 @@
#include "samplerate.h"
#include "jitter.h"
#include "loss.h"
#include "emphasis.h"
/* common structure of each transmitter */
typedef struct sender {
@@ -18,6 +19,9 @@ typedef struct sender {
void *sound;
int samplerate;
samplerate_t srstate; /* sample rate conversion state */
int pre_emphasis; /* use pre_emhasis, done by sender */
int de_emphasis; /* use de_emhasis, done by sender */
emphasis_t estate; /* pre and de emphasis */
/* loopback test */
int loopback; /* 0 = off, 1 = internal, 2 = external */
@@ -47,7 +51,7 @@ typedef struct sender {
/* list of all senders */
extern sender_t *sender_head;
int sender_create(sender_t *sender, const char *sounddev, int samplerate, const char *write_wave, const char *read_wave, int kanal, int loopback, double loss_volume, int use_pilot_signal);
int sender_create(sender_t *sender, const char *sounddev, int samplerate, int pre_emphasis, int de_emphasis, const char *write_wave, const char *read_wave, int kanal, int loopback, double loss_volume, int use_pilot_signal);
void sender_destroy(sender_t *sender);
void sender_send(sender_t *sender, int16_t *samples, int count);
void sender_receive(sender_t *sender, int16_t *samples, int count);