User user13267

115

votes

6

answers

66k

views

What does frequency domain denote in case of images?

Dec 13 '18 at 7:52 ชื่อ เท่ห์ รุ้ยัง 1

89

votes

9

answers

73k

views

What is the physical significance of negative frequencies?

frequency

Jul 6 '18 at 18:51 endolith 13k

81

votes

6

answers

149k

views

Why should I zero-pad a signal before taking the Fourier transform?

fft zero-padding

Jul 9 at 4:21 hotpaw2 30.1k

74

votes

4

answers

194k

views

What is meant by a system's “impulse response” and “frequency response?”

frequency impulse-response linear-systems frequency-response

Jan 18 '18 at 14:47 Jason R 22.3k

61

votes

4

answers

19k

views

Why is TV static noise always black and white?

noise color analog video

Jan 16 '18 at 13:00 Roger Lucas 31

61

votes

6

answers

27k

views

If humans can only hear up to 20 kHz frequency sound, why is music audio sampled at 44.1 kHz?

audio sampling nyquist

Sep 8 '18 at 20:21 endolith 13k

51

votes

4

answers

23k

views

Analogous Library to OpenCV for Audio Processing / Analysis

image-processing audio

Jun 10 '18 at 10:51 Marcus Müller 15.3k

44

votes

5

answers

58k

views

What is the difference between phase delay and group delay?

filters audio phase group-delay

Mar 17 at 17:23 robert bristow-johnson 13.2k

43

votes

6

answers

46k

views

Simplest way of detecting where audio envelopes start and stop

filters audio filter-design

Jan 6 '14 at 19:22 lennon310 3,377

22

votes

3

answers

11k

views

How did they color old black and white movies?

matlab

Dec 9 '13 at 21:00 user7211 21

18

votes

3

answers

4k

views

A good textbook for designing signal filters

filters filter-design reference-request control-systems

Jun 23 '17 at 13:10 nurabha 143

18

votes

9

answers

1k

views

Efficient Magnitude Comparison for Complex Numbers

algorithms complex numerical-algorithms

Jan 20 at 14:14 Dan Boschen 16.2k

16

votes

1

answer

16k

views

Terminology: spectrum, spectrogram, spectrograph, sonogram, etc

frequency-spectrum terminology visualization

Dec 27 '13 at 20:44 endolith 13k

16

votes

8

answers

4k

views

DSP or signal/image/data processing jokes

image-processing discrete-signals reference-request humor

Sep 17 at 16:40 Marcus Müller 15.3k

16

votes

9

answers

22k

views

Why do we use window in time domain rather than do FFT modify the spectrum and than inverse FFT

filters frequency-spectrum filter-design window-functions analog

Jun 21 '17 at 23:13 sm5bsz 131

15

votes

5

answers

6k

views

Can we break the Shannon capacity?

modulation reference-request channelcoding

Jul 11 '18 at 12:37 Bonny 1

14

votes

1

answer

2k

views

Why is $y(n) = x(n) + x(n-1)$ a low pass filter?

filters lowpass-filter

Dec 22 '11 at 16:11 Lorem Ipsum 5,283

14

votes

5

answers

11k

views

what is better: up- or downsampling?

resampling

Oct 2 at 2:18 Dacapi 11

14

votes

4

answers

5k

views

“The Fourier transform cannot measure two phases at the same frequency.” Why not?

fourier-transform fourier

Aug 9 at 10:37 Laurent Duval 20.9k

14

votes

7

answers

3k

views

Fourier transform is an isomorphism…but we don’t get when each frequency appears?

fourier-transform

Dec 14 at 16:27 hotpaw2 30.1k

13

votes

6

answers

2k

views

Relation between signal processing and control systems engineering?

control-systems control

Oct 2 at 19:20 Kevin 21

12

votes

6

answers

5k

views

What Approximation Techniques Exist for Computing the Square Root?

algorithms c numerical-algorithms

Mar 29 '19 at 11:32 Royi 12.6k

12

votes

3

answers

21k

views

What do the filter coefficients in a digital filter represent?

filters matlab

Nov 27 '13 at 2:15 Community♦ 1

11

votes

6

answers

5k

views

Is there any practical application for performing a double Fourier transform? …or an inverse Fourier transform on a time-domain input?

fft signal-analysis fourier-transform hilbert-transform theory

Aug 25 at 12:42 Laurent Duval 20.9k

10

votes

3

answers

2k

views

Implementation of Wikipedia Equation for the DFT

fourier-transform python dft

Jan 16 at 22:00 Nimitz14 199

10

votes

3

answers

2k

views

What Does It Mean Exactly When Two Parts of a Signal Are Correlated?

statistics correlation terminology

Mar 29 '19 at 11:35 Royi 12.6k

10

votes

2

answers

3k

views

Artifacts in FFT

fft fourier-transform dft

May 21 '13 at 20:21 niaren 1,793

9

votes

1

answer

1k

views

Theory behind Linear Predictive Coding (LPC)

linear-systems voice compression linear-prediction

Sep 9 '16 at 18:42 Gilles 2,356

9

votes

3

answers

1k

views

Fourier Transform Identities

fourier-transform continuous-signals

Aug 8 at 19:35 Laurent Duval 20.9k

9

votes

1

answer

712

views

Detect human speech in realtime audio on mobile phones

audio speech real-time

Sep 26 '18 at 6:01 Community♦ 1

Stack Exchange Network

current community

your communities

more stack exchange communities

Next privilege

Next badge

88 Favorites

What does frequency domain denote in case of images?

What is the physical significance of negative frequencies?

Why should I zero-pad a signal before taking the Fourier transform?

What is meant by a system's “impulse response” and “frequency response?”

Why is TV static noise always black and white?

If humans can only hear up to 20 kHz frequency sound, why is music audio sampled at 44.1 kHz?

Analogous Library to OpenCV for Audio Processing / Analysis

What is the difference between phase delay and group delay?

Simplest way of detecting where audio envelopes start and stop

How did they color old black and white movies?

A good textbook for designing signal filters

Efficient Magnitude Comparison for Complex Numbers

Terminology: spectrum, spectrogram, spectrograph, sonogram, etc

DSP or signal/image/data processing jokes

Why do we use window in time domain rather than do FFT modify the spectrum and than inverse FFT

Can we break the Shannon capacity?

Why is $y(n) = x(n) + x(n-1)$ a low pass filter?

what is better: up- or downsampling?

“The Fourier transform cannot measure two phases at the same frequency.” Why not?

Fourier transform is an isomorphism…but we don’t get when each frequency appears?

Relation between signal processing and control systems engineering?

What Approximation Techniques Exist for Computing the Square Root?

What do the filter coefficients in a digital filter represent?

Is there any practical application for performing a double Fourier transform? …or an inverse Fourier transform on a time-domain input?

Implementation of Wikipedia Equation for the DFT

What Does It Mean Exactly When Two Parts of a Signal Are Correlated?

Artifacts in FFT

Theory behind Linear Predictive Coding (LPC)

Fourier Transform Identities

Detect human speech in realtime audio on mobile phones