§4.2 The Frequency Response The quantity H(ei)is called the frequency response of the LTI discrete- time system H(ei)provides a frequency-domain description of the system H(ei)is precisely the DTFT of the impulse response (h[n]}of the system§4.2 The Frequency Response • The quantity H(ejω) is called the frequency response of the LTI discrete￾time system • H(ejω) provides a frequency-domain description of the system • H(ejω) is precisely the DTFT of the impulse response {h[n]} of the system