Frequency Response of Linear Interpolation
Since linear interpolation can be expressed as a convolution of the samples with a triangular pulse, we can derive the frequency response of linear interpolation. Figure 4.7 indicates that the triangular pulse
serves as an anti-aliasing lowpass
filter for the subsequent downsampling by 
. Therefore, it should
ideally ``cut off'' all frequencies higher than 
.
Next Section:
Triangular Pulse as Convolution of Two Rectangular Pulses
Previous Section:
Convolution Interpretation
