int main (int argc, char *argv[])
{
awgn_state_t noise_source;
dc_restore_state_t dc_state;
int i;
int idum = 1234567;
int16_t dirty;
int16_t clean;
int estimate;
int min;
int max;
int dc_offset;
dc_offset = 5000;
awgn_init_dbm0(&noise_source, idum, -10.0);
dc_restore_init(&dc_state);
for (i = 0; i < 100000; i++)
{
dirty = awgn(&noise_source) + dc_offset;
clean = dc_restore(&dc_state, dirty);
if ((i % 1000) == 0)
{
printf("Sample %6d: %d (expect %d)\n",
i,
dc_restore_estimate(&dc_state),
dc_offset);
}
}
/* We should have settled by now. Look at the variation we get */
min = 99999;
max = -99999;
for (i = 0; i < 100000; i++)
{
dirty = awgn(&noise_source) + dc_offset;
clean = dc_restore(&dc_state, dirty);
estimate = dc_restore_estimate(&dc_state);
if (estimate < min)
min = estimate;
if (estimate > max)
max = estimate;
}
printf("Spread of DC estimate for an offset of %d was %d to %d\n", dc_offset, min, max);
if (min < dc_offset - 50 || max > dc_offset + 50)
{
printf("Test failed.\n");
exit(2);
}
printf("Test passed.\n");
return 0;
}
SPAN_DECLARE(int) fax_rx(fax_state_t *s, int16_t *amp, int len)
{
int i;
#if defined(LOG_FAX_AUDIO)
if (s->modems.audio_rx_log >= 0)
write(s->modems.audio_rx_log, amp, len*sizeof(int16_t));
#endif
for (i = 0; i < len; i++)
amp[i] = dc_restore(&s->modems.dc_restore, amp[i]);
s->modems.rx_handler(s->modems.rx_user_data, amp, len);
t30_timer_update(&s->t30, len);
return 0;
}
int fax_rx(fax_state_t *s, int16_t *amp, int len)
{
int i;
#if defined(LOG_FAX_AUDIO)
if (s->fax_audio_rx_log >= 0)
write(s->fax_audio_rx_log, amp, len*sizeof(int16_t));
#endif
for (i = 0; i < len; i++)
amp[i] = dc_restore(&(s->dc_restore), amp[i]);
s->rx_handler(s->rx_user_data, amp, len);
t30_timer_update(&(s->t30_state), len);
return 0;
}
// function restore_card
static int KSAPI restore_card(ks_reader_dev_t *dev,ks_card_info_t *card,int block_no) {
return -1;
#if 0
int ret;
if(block_no >= 32*4 || block_no <= 0)
return KS_BLOCK_OVERFLOW;
if(!g_dev_hd)
return KS_PORT_NOTOPEN;
ret = dc_restore(g_dev_hd,block_no);
if(ret)
return KS_WRITEPURSE;
return 0;
#endif
}
