
8.2. WINDSK DEMONSTRATION 157
To obtain the filter’s output, the portions of y
0
[n], y
1
[n], and y
0
[n]thatdonot have large
X’s drawn through them are concatenated. The final subplot in Figure 8.8 is provided for
comparison and is the system’s output using traditional time-domain convolution. These
last two subplots demonstrate that, with the exception of the filter’s initial transient, the
transform-based technique and traditional convolution return the same result.
In summary, the overlap and add technique has no overlap of the inputs but must add
the overlapped portions of the output segments for a correct result. The overlap and save
technique overlaps ...