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git-svn-id: http://svn.openzap.org/svn/openzap/trunk@210 a93c3328-9c30-0410-af19-c9cd2b2d52af
This commit is contained in:
Anthony Minessale 2007-06-05 01:31:25 +00:00
parent 9923827d1e
commit 42c70840d8
2 changed files with 43 additions and 2 deletions
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34
libs/openzap/src/dsp/fsk.c
View File

@ -306,7 +306,39 @@ dsp_fsk_sample (dsp_fsk_handle_t *handle, double normalized_sample)
if (handle->cellpos > 1.0) { if (handle->cellpos > 1.0) {
handle->cellpos -= 1.0; handle->cellpos -= 1.0;
(*handle->attr.bithandler) (handle->attr.bithandler_arg, handle->current_bit);
switch (handle->state) {
case FSK_STATE_DATA:
(*handle->attr.bithandler) (handle->attr.bithandler_arg, handle->current_bit);
break;
case FSK_STATE_CHANSEIZE:
if (handle->last_bit != handle->current_bit) {
handle->conscutive_state_bits++;
} else {
handle->conscutive_state_bits = 0;
}
if (handle->conscutive_state_bits > 15) {
handle->state = FSK_STATE_CARRIERSIG;
handle->conscutive_state_bits = 0;
}
break;
case FSK_STATE_CARRIERSIG:
if (handle->current_bit) {
handle->conscutive_state_bits++;
} else {
handle->conscutive_state_bits = 0;
}
if (handle->conscutive_state_bits > 15) {
handle->state = FSK_STATE_DATA;
handle->conscutive_state_bits = 0;
}
break;
}
handle->last_bit = handle->current_bit;
} }
} }

11
libs/openzap/src/dsp/fsk.h
View File

@ -35,6 +35,12 @@
#define __FSK_H__ #define __FSK_H__
#include "uart.h" #include "uart.h"
typedef enum {
FSK_STATE_CHANSEIZE = 0,
FSK_STATE_CARRIERSIG,
FSK_STATE_DATA
} fsk_state_t;
typedef struct dsp_fsk_attr_s typedef struct dsp_fsk_attr_s
{ {
int sample_rate; /* sample rate in HZ */ int sample_rate; /* sample rate in HZ */
@ -46,7 +52,8 @@ typedef struct dsp_fsk_attr_s
typedef struct typedef struct
{ {
dsp_fsk_attr_t attr; /* attributes structure */ fsk_state_t state;
dsp_fsk_attr_t attr; /* attributes structure */
double *correlates[4]; /* one for each of sin/cos for mark/space */ double *correlates[4]; /* one for each of sin/cos for mark/space */
int corrsize; /* correlate size (also number of samples in ring buffer) */ int corrsize; /* correlate size (also number of samples in ring buffer) */
double *buffer; /* sample ring buffer */ double *buffer; /* sample ring buffer */
@ -55,8 +62,10 @@ typedef struct
double celladj; /* bit cell adjustment for each sample */ double celladj; /* bit cell adjustment for each sample */
int previous_bit; /* previous bit (for detecting a transition to sync-up cell position) */ int previous_bit; /* previous bit (for detecting a transition to sync-up cell position) */
int current_bit; /* current bit */ int current_bit; /* current bit */
int last_bit;
int downsampling_count; /* number of samples to skip */ int downsampling_count; /* number of samples to skip */
int current_downsample; /* current skip count */ int current_downsample; /* current skip count */
int conscutive_state_bits; /* number of bits in a row that matches the pattern for the current state */
} dsp_fsk_handle_t; } dsp_fsk_handle_t;
/* /*