ECG	Electrocardiogram
MECG	Mother electrocardiogram
FECG	Fetal electrocardiogram
WHO	World Health Organization
AbdECG	Abdominal electrocardiogram
EKG	Electrocardiography
$p_j$	The probability at the level j
Se	Sensitivity
PPV	Positive predictive value
DAISY	Data base for the Identification of Systems
CinC Challenge 2013	Computing in Cardiology Challenge 2013
R-peaks	Real peaks
STFT	Short time Fourier transform
QRS	ventricular depolarization curve
RR	Interval between two R-peaks
FHR	Fetal heart rate
QT	The sum of depolarization (QRS) and repolarization (T)
SNR	Signal-to-noise ratio
R-Wave	Ventricular depolarization
HFSCH	Haar-Faber-Schauder
TD	Truly diagnosed
FP	False positive
FN	False negative
$AFEC{G}_J$	Approximation of the fetal electrocardiogram at the level J
$AMEC{G}_J$	Approximation of the mother electrocardiogram at the level J
$A{S}_J$	Approximation of a signal S at the level j
$DFEC{G}_J$	Detail component of the fetal electrocardiogram at the level J
$DMEC{G}_J$	Detail component of the mother electrocardiogram at the level J
$D{S}_J$	Detail component of a signal S at the level J
$d_{j,k}$	detail coefficient at the level j and the position k
$C_{j,k}$	Approximation coefficient at the level j and the position k
$E{S}_j$	The energy of a signal S at the level j
$ES$	The total energy of a signal S
$Ent$	The entropy of the signal
$Ent\left(J\right)$	The entropy of the signal at the level J