Audio processing model in Simulink - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read an audio file into the model.

Simulink

audioData = audioread([1]);

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A'input.wav'

Binput.wav

CreadAudio('input.wav')

Daudio.read('input.wav')

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the filename

Using a function that does not exist in Simulink

The audioread function requires the filename as a string, so it must be enclosed in quotes.

2fill in blank

medium

Complete the code to extract the sampling frequency from the audio file.

Simulink

[audioData, [1]] = audioread('input.wav');

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AsampleRate

Bfreq

Cfs

Drate

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names that are not standard

Confusing sampling frequency with audio data

The variable fs is commonly used to represent the sampling frequency in audio processing.

3fill in blank

hard

Fix the error in the code to play the audio data correctly.

Simulink

sound([1], fs);

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Aaudio

BaudioData

Caudio_data

DsoundData

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that was not defined

Mixing underscores and camelCase

The variable holding the audio samples is audioData, so it must be passed to the sound function.

4fill in blank

hard

Fill both blanks to create a filter that applies a gain of 0.5 to the audio signal.

Simulink

filteredAudio = [1] * [2];

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A0.5

BaudioData

Caudio_data

D1.5

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong variable name for audio data

Using a gain value greater than 1 which increases volume

Multiplying the audio data by 0.5 reduces its volume by half.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping words to their lengths for words longer than 3 characters.

Simulink

lengths = { [1]: [2] for [3] in words if len([3]) > 3 }

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Aword

Blen(word)

Dw

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently

Not filtering words by length

This dictionary comprehension maps each word to its length, but only includes words longer than 3 characters.