Thus, a twin-T notch filter
with a 60HZ cut off frequency was used to eliminate the powerline noise; additionally, a variable quality factor is achieved with a potentiometer that not only enhances the efficiency of the filter but also reduces errors.
The variation of the bandwidth of the notch filter
stopband around -3 dB provided by (21) is indicated, taking into account M = 2, some values of J and L, f = ([omega]/2[pi]) x [f.sub.s], and [f.sub.s] = 5 kHz.
For "Book Page 2", Triangle, Hermite, Quadratic, Cubic B-Spline, Gaussian and Notch filters
were constantly the best.
Bakhshai, "Time-domain Signal Analysis using Adaptive Notch Filter
", IEEE Transactions on Signal Processing, vol.
Pei and Tseng  propose a method to decrease the transient time of multiple IIR notch filters
. This technique uses the vector projection in order to find better initial values for the IIR notch filter
Li, "Performance analysis of the notch filter
for RF interference suppression in ultra-wideband SAR," Proc.
The experimental setup is divided into three parts, in first part ECG signals processed to remove baseline wander noise by designed FIR and IIR highpass filters, in second part high passed ECG signals passed through lowpass FIR and IIR filters to remove muscle noise artifact and in third part IIR notch filter
used to remove 50/60 Hz power component noise as shown in Fig.
The first step of this approach uses an adaptive notch filter
to eliminate the DC component of the ECG.
Using digital signal processing techniques automatic gain control, notch filter
and band pass filter have been incorporated for initial processing of raw data to enhance the weak events from far offsets and suppress any coherent noise.
The full closed-loop control, auto notch filter
, vibration suppression and gantry control functions of ASDA-A2 help to perform complex motions that require high precision and smooth operation.