Tektronix AWG2021 User Manual page 194

AWG2021 User Manual
H Interpolation. The data is re-sampled when shifting by fractional amounts.
Data values between data points are acquired by interpolation. The Inter-
polation item selects the interpolation method used. The following two
options are provided.
Linear interpolation
Quadratic interpolation
Linear interpolation is appropriate if the original waveform consists of
straight lines, such as triangle or square waves. However, the peaks in
waveforms with extremely sharp peaks may be flattened somewhat.
Quadratic interpolation is appropriate for waveforms with curves, such as
sine waves. However, in waveforms with extremely sharp peaks, some peaks
may become wider.
Linear Interpolation. Figure 3 -55 provides an overview of linear interpola-
tion. If the point X is shifted to the left by 0.2, the new value is calculated
2
by interpolating with the next point to the left.
Y
3
Y
2
Y '
2
Y
1
X X '
1 2
Figure 3 55: Linear Interpolation
If the coordinate of the shifted point is X
given by the following formula.
+ 0.2 ) (1 * 0.2)
Y Y
2 1
Quadratic Interpolation. Figure 3 -56 provides an overview of quadratic
interpolation. If the point X
calculated by interpolating using three points, the shifted point itself and the
preceding and following points.
X
X
2
3
', then the value of the point Y
2
Y
2
is shifted to the left by 0.2, the new value is
2
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' is
2
3 75