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Which of the following filters have a block diagram as shown in the figure?

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Which of the following filters have a block diagram as shown in the figure?

(a) Pade wiener filter

(b) Pade FIR filter

(c) Least squares FIR filter

(d) Least squares wiener filter

I got this question in final exam.

My query is from FIR Least Squares Inverse Filters in section Digital Filters Design of Digital Signal Processing

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Best answer
Correct answer is (d) Least squares wiener filter

Best explanation: Since from the block diagram, the coefficients of the FIR filter coefficients are optimized by the least squares error criterion, it belongs to the least squares FIR inverse filter or wiener filter.

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