Lines Matching full:snr
90 #define MAXSNR 40. /* max SNR reference */
127 * DGATE is lit if the data bit amplitude or SNR is below thresholds and
128 * BGATE is lit if the pulse width amplitude or SNR is below thresolds.
159 #define LOWERR 0x2 /* low bit or digit amplitude or SNR */
176 * Thresholds. These establish the minimum signal level, minimum SNR and
185 #define ASNR 20. /* QRZ minute sync SNR threshold (dB) */
187 #define QSNR 20. /* QSY minute sync SNR threshold (dB) */
189 #define SSNR 15. /* second sync SNR threshold (dB) */
192 #define DSNR 10. /* bit SNR threshold (dB) */
491 double synsnr; /* sync signal SNR */
539 double eposnr; /* second sync SNR */
568 double datsnr; /* data signal SNR (dB) */
1240 * not in minute sync, fiddle the codec gain. Note the SNR is
1243 * SNR should plummet. The signal is scaled to produce unit
1288 * amplitude at least QTHR (2500) and SNR at least QSNR (20) dB and the
1327 * jitter. When calculating the SNR, subtract the pulse energy
1415 * If the signal amplitude or SNR fall below thresholds, dim the
1656 * compute the SNR. Use the Q sample to adjust the 100-Hz
1691 * compute the SNR for the data pulse. This gives a better
1706 * If the amplitude or SNR is below threshold, average a
1808 * at 800 ms as the signal later used to calculate the SNR.
1818 * at 800 ms as the noise to calculate the SNR. If the minute
1819 * sync pulse and SNR are above thresholds and the data pulse
1820 * amplitude and SNR are above thresolds, shift a 1 into the
1926 * greatest and the next lower for later SNR calculation.
1948 * integrating noise under low SNR conditions.
2138 * Note the SNR is calculated as the ratio of the largest
2171 * mistakes when the signal is low and the SNR is very marginal.
2331 * wwv_snr - compute SNR or likelihood function
2345 * zero, the SNR must always be zero. This can happen with the
2346 * subcarrier SNR before the phase has been aligned. On the
2349 * However, in this case the SNR is truly stupendous, so we