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Table 1 Symbols used and their settings.

From: The automatic recognition and counting of cough

Symbol

Meaning

Value

f s

Sampling Frequency

11025 Hz

t

Time in milliseconds

 

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

  1. Settings are based on established values and preliminary experiments. Symbols only used locally are explained in the text.