Shahed Salehzehi - Islamic Azad University of Mashhad, Iran
Saeid Alizadeh - Montazeri Technical and Vocational University, Mashhad, Iran
Elyas Irankhah - University of Massachusetts Lowell, USA

The beginning of the pulse formed within the sinus node in normal heart rhythms. Cardiac arrhythmias are commonly known as tachycardia (supraventricular or atrial fibrillation) or bradycardia, and in the absence of arrhythmias, which can be separated from a simple signal by an arrhythmic signal, children's hearts experience systemic cardiac disease. I separated the channels first, then showed the periodicity period and time-frequency domain.

Cardiac arrhythmia, Tachycardia, Sinus rhythm, Filtration