Symbol | Meaning | Value |
---|---|---|
f s | Sampling Frequency | 11025 Hz |
t | Time in milliseconds | Â |
σsignal | Windowed standard deviation of signal | Calculated as a function of time |
Δtbackground | Background interval | 11026 points (1000 ms) |
thresh peak | High (event detection) threshold | 10 (×σbackground) |
thresh limits | Low (event start and end) threshold | 2 (×σbackground) |
σbackground | Standard deviation of background |  |
N train | Number of reference patterns | 150 (75 cough/75 non-cough) |
n b-o-f | Number of mel bank-of-filters cepstral coefficients | 42 (14+14 1st derivatives +14 2nd derivatives) |
n LPC | Number of LPC cepstral coefficients | 14 (no derivatives) |
N cepstral | Total number of cepstral coefficients (nB-O-F + nLPC) | 56 |
N PCA | Reduced number of features | 45 |