PAYNTER returns the filter coefficients for a Paynter Filter
Usually, the filter is applied to the rectified electromyogram (EMG).
Then, the output is amplitude-demodulated EMG
The amplitude demodulated EMG can be obtained through
y = filter(B,A,abs(x));
with
[B,A]=paynter(tau,fs)
[B,A]=paynter(tau,fs,'modified')
[B,A]=paynter(tau,fs,'bessel-modified')
tau time constant (in [s])
fs sampling rate (in [Hz])
REFERENCE(S):
[1] Platt, Ronald S., Eric A. Hajduk, Manuel Hulliger, and Paul A. Easton.
A modified Bessel filter for amplitude demodulation of respiratory electromyograms.
J. Appl. Physiol. 84(1): 378-388, 1998.
available online: http://jap.physiology.org/cgi/content/full/84/1/378
[2] Gottlieb, G.L. and Agarwal.
Filtering of Electromyographic Signals. Am.J.Physical Medicine 49(3):142-146, 1970.
[3] Hopp, F.A., J.L. Seagard, and J.P. Kampine.
Comparison of four methods of averaging nerve activity. Am. J. Physiology 251:R700-R711, 1986.
[4] Bruce, E. N., M. D. Goldman, and J. Mead.
A digital computer technique for analyzing respiratory muscle EMGs.
J. Appl. Physiol. 43: 551-556, 1977
available online: http://jap.physiology.org/cgi/content/abstract/43/3/551