FIR filter design (firwin) in SciPy - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the firwin function from scipy.signal.

SciPy

from scipy.signal import [1]

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Alfilter

Bfft

Cbutter

Dfirwin

Attempts:

3 left

💡 Hint

Common Mistakes

Importing the wrong function like butter or fft.

Forgetting to import from scipy.signal.

The firwin function is used to design FIR filters and is imported from scipy.signal.

2fill in blank

medium

Complete the code to design a lowpass FIR filter with 51 taps and cutoff frequency 0.3 (normalized).

SciPy

coefficients = firwin([1], cutoff=0.3)

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A100

B10

C51

D25

Attempts:

3 left

💡 Hint

Common Mistakes

Using too small or even number of taps.

Confusing cutoff frequency with number of taps.

The number of taps (filter length) is 51, which is an odd number commonly used for FIR filters.

3fill in blank

hard

Fix the error in the code to design a highpass FIR filter with 31 taps and cutoff 0.4.

SciPy

coeffs = firwin(31, cutoff=0.4, [1]=False)

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Apass_zero

Bhighpass

Cstopband

Dbandpass

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'highpass' as a parameter name (not valid).

Omitting the pass_zero parameter.

To design a highpass filter with firwin, set pass_zero=False.

4fill in blank

hard

Fill both blanks to design a bandpass FIR filter with 61 taps and cutoff frequencies 0.2 and 0.5.

SciPy

coeffs = firwin([1], cutoff=[2], pass_zero="bandpass")

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A61

B[0.2, 0.5]

C31

D[0.1, 0.4]

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single cutoff value instead of a list.

Setting pass_zero=True for bandpass.

Bandpass filters require a list of cutoff frequencies and pass_zero='bandpass'. The number of taps is 61.

5fill in blank

hard

Fill all three blanks to create a FIR filter with 41 taps, cutoff 0.25, and use a Hamming window.

SciPy

coeffs = firwin([1], cutoff=[2], window=[3])

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A41

B0.25

C'hamming'

D'hann'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong window type like 'hann' instead of 'hamming'.

Confusing cutoff frequency with number of taps.

The filter length is 41 taps, cutoff frequency is 0.25, and the window type is 'hamming' for smooth coefficients.