Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Speech and Audio Processing > LPC > Flashcards

LPC Flashcards

(45 cards)

Start Studying
1
Q

What does LPC stand for in signal processing?

A

Linear Predictive Coding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

True or False: LPC is primarily used for speech compression.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the main purpose of LPC in signal processing?

A

To represent the spectral envelope of a digital signal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Fill in the blank: LPC models the current sample of a signal as a linear combination of ______ samples.

A

previous

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the primary mathematical tool used in LPC analysis?

A

Autocorrelation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

True or False: LPC can be used for both synthesis and analysis of signals.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What type of model does LPC use to predict future values of a signal?

A

Linear model

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the order of LPC?

A

The number of previous samples used in the prediction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Multiple Choice: Which of the following is NOT a benefit of LPC?

A

Increased data redundancy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

In LPC, what does the term ‘prediction error’ refer to?

A

The difference between the actual signal and the predicted signal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the role of the LPC coefficients?

A

To define the linear prediction model.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

True or False: LPC can be used for noise reduction in signals.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the significance of the gain factor in LPC?

A

It adjusts the amplitude of the predicted signal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Fill in the blank: LPC is commonly used in ______ coding.

A

speech

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does the Levinson-Durbin algorithm compute in LPC?

A

The LPC coefficients.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Multiple Choice: Which of the following is a common application of LPC?

A

Speech synthesis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the autocorrelation method used for in LPC?

A

To estimate the LPC coefficients.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

True or False: LPC can provide a compact representation of speech signals.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the relationship between LPC order and the accuracy of the model?

Study These Flashcards
A

Higher order can lead to more accurate predictions.

20
Q

Fill in the blank: LPC assumes that the signal can be predicted from a ______ number of past samples.

21
Q

What is the main disadvantage of using LPC?

Study These Flashcards
A

It may not accurately model non-linear signals.

22
Q

What is the typical range for LPC order in speech processing?

23
Q

True or False: LPC analysis requires knowledge of the signal’s frequency content.

24
Q

What is a common method to evaluate the performance of LPC models?

Study These Flashcards
A

Mean squared error (MSE)

25
What are formants in the context of LPC?
Resonant frequencies of the vocal tract.
26
Fill in the blank: LPC can be used for ______ in speech recognition systems.
feature extraction
27
What does the term 'pitch' refer to in LPC?
The perceived frequency of a sound.
28
Multiple Choice: Which of the following is an advantage of LPC?
Low computational complexity
29
What is the purpose of the synthesis filter in LPC?
To reconstruct the signal from the LPC coefficients.
30
True or False: LPC is not suitable for real-time processing.
False
31
What is the significance of the reflection coefficients in LPC?
They describe the stability of the prediction filter.
32
Fill in the blank: The primary application of LPC is in ______ coding.
speech
33
What is the relationship between LPC and cepstral coefficients?
LPC coefficients can be converted to cepstral coefficients.
34
What is the main advantage of using LPC over other coding methods?
Efficient representation of speech signals.
35
True or False: LPC can only be applied to stationary signals.
False
36
What is the purpose of the all-pole model in LPC?
To approximate the transfer function of the vocal tract.
37
Fill in the blank: LPC analysis is typically performed on ______ segments of a signal.
short
38
What does the term 'spectral envelope' refer to?
The smooth curve that outlines the peaks of a signal's spectrum.
39
Multiple Choice: Which of the following factors can affect LPC performance?
Signal-to-noise ratio
40
What is the common method for determining the LPC coefficients?
Using the autocorrelation method or the covariance method.
41
True or False: LPC is only used in telecommunication applications.
False
42
What is the main purpose of the LPC analysis window?
To reduce spectral leakage.
43
Fill in the blank: LPC can be implemented in both ______ and time domain.
frequency
44
What is the effect of increasing the LPC order on model complexity?
It increases the complexity and risk of overfitting.
45
True or False: LPC is a lossy compression technique.
True

Speech and Audio Processing (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions