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Chapter 3 121
Basic Digital Operation
Using Finite Impulse Response (FIR) Filters
2. Use the numeric keypad to type the first value (0.000076) from Table 3-1. As you press
the numeric keys, the numbers are displayed in the active entry area. (If you make a
mistake, you can correct it using the backspace key.)
3. Continue entering the coefficient values from the table in step 1 until all 16 values have
been entered.
Duplicating the First 16 Coefficients Using Mirror Table
In a windowed sinc function filter, the second half of the coefficients are identical to the first
half in reverse order. The signal generator provides a mirror table function that automatically
duplicates the existing coefficient values in the reverse order.
1. Press
Mirror Table. The last 16 coefficients (16 through 31) are automatically generated and
the first of these coefficients (number 16) highlights, as shown in Figure 3-25 on page 122.
Table 3-1
Coefficient Value Coefficient Value
0
0.000076 8 0.035667
1
0.001747 9 0.116753
2
0.005144 10 0.157348
3 0.004424 11 0.088484
4 0.007745 12 0.123414
5 0.029610 13 0.442748
6 0.043940 14 0.767329
7 0.025852 15 0.972149
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