§4.2 The Frequency Response Note:Magnitude and phase functions are real functions of o,whereas the frequency response is a complex function of o If the impulse response h[n]is real then the magnitude function is an even function of o: H(eio)川=IH(e-jo)川 and the phase function is an odd function of o: 0(@)=-0(-0)§4.2 The Frequency Response • Note: Magnitude and phase functions are real functions of ω, whereas the frequency response is a complex function of ω • If the impulse response h[n] is real then the magnitude function is an even function of ω: |H(ejω)| = |H(e - jω)| and the phase function is an odd function of ω: θ(ω) = - θ(-ω)