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In Parks-McClellan program, the grid density for interpolating the error function is denoted by which of the following functions?

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In Parks-McClellan program, the grid density for interpolating the error function is denoted by which of the following functions?

(a) NFILT

(b) NBANDS

(c) EDGE

(d) LGRID

The question was asked in exam.

My question is from Design of Optimum Equi Ripple Linear Phase FIR Filters in section Digital Filters Design of Digital Signal Processing

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Right choice is (d) LGRID

Easiest explanation: In Parks-McClellan program, LGRID represents the grid density for interpolating the error function. The default value is 16 if left unspecified.

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