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Audio Signal Processing

Description: This quiz covers the fundamental concepts and techniques used in audio signal processing.
Number of Questions: 14
Created by:
Tags: audio signal processing digital signal processing sound engineering
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Which of the following is NOT a basic operation in audio signal processing?

  1. Filtering

  2. Compression

  3. Equalization

  4. Quantization

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Correct Option: D
Explanation:

Quantization is a process used in analog-to-digital conversion, which is not a basic operation in audio signal processing.

What is the purpose of a low-pass filter in audio signal processing?

  1. To remove high-frequency noise

  2. To boost low-frequency components

  3. To create a reverberant effect

  4. To enhance the stereo image

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Correct Option: A
Explanation:

A low-pass filter is used to remove high-frequency noise from an audio signal, such as hiss or unwanted sibilance.

What is the difference between time-domain and frequency-domain representations of an audio signal?

  1. Time-domain represents the signal as a function of time, while frequency-domain represents it as a function of frequency.

  2. Time-domain represents the signal as a function of amplitude, while frequency-domain represents it as a function of phase.

  3. Time-domain represents the signal as a function of power, while frequency-domain represents it as a function of energy.

  4. Time-domain represents the signal as a function of waveform, while frequency-domain represents it as a function of spectrum.

Show answer
Correct Option: A
Explanation:

Time-domain representation shows how the signal changes over time, while frequency-domain representation shows the distribution of energy across different frequencies.

Which of the following is a common technique used for noise reduction in audio signals?

  1. Spectral subtraction

  2. Adaptive filtering

  3. Masking

  4. Dithering

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Correct Option: A
Explanation:

Spectral subtraction is a technique that involves estimating the noise spectrum and subtracting it from the noisy signal to enhance the desired audio content.

What is the purpose of a compressor in audio signal processing?

  1. To reduce the dynamic range of an audio signal

  2. To increase the loudness of an audio signal

  3. To create a stereo effect

  4. To remove unwanted distortion

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Correct Option: A
Explanation:

A compressor is used to reduce the dynamic range of an audio signal, making the loud parts quieter and the quiet parts louder.

Which of the following is a common technique used for pitch shifting in audio signals?

  1. Time stretching

  2. Frequency shifting

  3. Phase vocoding

  4. Resampling

Show answer
Correct Option: B
Explanation:

Frequency shifting is a technique that involves changing the frequency of an audio signal, resulting in a change in pitch.

What is the Nyquist frequency in audio signal processing?

  1. The highest frequency that can be accurately represented in a digital audio signal

  2. The lowest frequency that can be accurately represented in a digital audio signal

  3. The frequency at which the sampling rate is equal to the signal frequency

  4. The frequency at which the signal-to-noise ratio is maximized

Show answer
Correct Option: A
Explanation:

The Nyquist frequency is the highest frequency that can be accurately represented in a digital audio signal without aliasing.

Which of the following is a common technique used for reverberation in audio signals?

  1. Convolution

  2. Delay

  3. Feedback

  4. All of the above

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Correct Option: D
Explanation:

Convolution, delay, and feedback are all commonly used techniques for creating reverberation in audio signals.

What is the purpose of a limiter in audio signal processing?

  1. To prevent clipping

  2. To reduce the dynamic range of an audio signal

  3. To increase the loudness of an audio signal

  4. To create a stereo effect

Show answer
Correct Option: A
Explanation:

A limiter is used to prevent clipping, which occurs when the amplitude of an audio signal exceeds the maximum allowed level.

Which of the following is a common technique used for equalization in audio signals?

  1. Shelving filter

  2. Parametric EQ

  3. Graphic EQ

  4. All of the above

Show answer
Correct Option: D
Explanation:

Shelving filter, parametric EQ, and graphic EQ are all commonly used techniques for equalization in audio signals.

What is the purpose of a noise gate in audio signal processing?

  1. To remove unwanted noise from an audio signal

  2. To reduce the dynamic range of an audio signal

  3. To increase the loudness of an audio signal

  4. To create a stereo effect

Show answer
Correct Option: A
Explanation:

A noise gate is used to remove unwanted noise from an audio signal by closing the gate when the signal level falls below a certain threshold.

Which of the following is a common technique used for panning in audio signals?

  1. Delay

  2. Volume balancing

  3. Phase shifting

  4. All of the above

Show answer
Correct Option: D
Explanation:

Delay, volume balancing, and phase shifting are all commonly used techniques for panning in audio signals.

What is the purpose of a ducker in audio signal processing?

  1. To reduce the level of one audio signal when another signal is present

  2. To increase the level of one audio signal when another signal is present

  3. To create a stereo effect

  4. To remove unwanted noise from an audio signal

Show answer
Correct Option: A
Explanation:

A ducker is used to reduce the level of one audio signal when another signal is present, often used for ducking background music during speech.

Which of the following is a common technique used for spatialization in audio signals?

  1. Binaural recording

  2. Head-related transfer function (HRTF)

  3. Ambisonics

  4. All of the above

Show answer
Correct Option: D
Explanation:

Binaural recording, HRTF, and Ambisonics are all commonly used techniques for spatialization in audio signals.

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