2. 2. 4 Frequency representation of periodic signals u a2 is the constant-value or the d. c component of a periodic signal o The term for na 1 is referred to as the fundamenta (component), or as the first harmonic component a the component for n=N is referred to as the Nth harmonic component u The representation of a periodic signal in the form of Eq( 2.15)is referred to as the Fourier series representation An: amplitude of the nth harmonic component Pn: phase shift of the nth harmonic component❑ a0 /2 is the constant-value or the d.c. component of a periodic signal. ❑ The term for n=1 is referred to as the fundamental (component), or as the first harmonic component. ❑ The component for n=N is referred to as the Nth harmonic component. ❑ The representation of a periodic signal in the form of Eq. (2.15) is referred to as the Fourier series representation: ▪ An : amplitude of the nth harmonic component ▪ φn : phase shift of the nth harmonic component 2.2.4 Frequency representation of periodic signals