User user13267

122

votes

6

answers

72k

views

What does frequency domain denote in case of images?

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

94

votes

9

answers

78k

views

What is the physical significance of negative frequencies?

frequency

Jul 6 '18 at 18:51 endolith 13.7k

86

votes

6

answers

162k

views

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

fft zero-padding

Jul 9 '19 at 4:21 hotpaw2 31.4k

76

votes

4

answers

204k

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 Community♦ 1

62

votes

4

answers

20k

views

Why is TV static noise always black and white?

noise color analog video

Jan 16 '18 at 13:00 Roger Lucas 31

62

votes

6

answers

28k

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 13.7k

54

votes

4

answers

25k

views

Analogous Library to OpenCV for Audio Processing / Analysis

image-processing audio

Jun 10 '18 at 10:51 Marcus Müller 19.9k

46

votes

5

answers

63k

views

What is the difference between phase delay and group delay?

filters audio phase group-delay

Aug 1 at 13:26 Alex Deft 105

44

votes

6

answers

48k

views

Simplest way of detecting where audio envelopes start and stop

filters audio filter-design

Jan 6 '14 at 19:22 lennon310 3,410

22

votes

3

answers

12k

views

How did they color old black and white movies?

matlab

Dec 9 '13 at 21:00 user7211 21

18

votes

1

answer

18k

views

Terminology: spectrum, spectrogram, spectrograph, sonogram, etc

frequency-spectrum terminology visualization

Dec 27 '13 at 20:44 endolith 13.7k

18

votes

3

answers

5k

views

A good textbook for designing signal filters

filters filter-design reference-request control-systems

Jun 23 '17 at 13:10 nurabha 153

18

votes

9

answers

2k

views

Efficient Magnitude Comparison for Complex Numbers

algorithms complex numerical-algorithms

Jan 20 '20 at 14:14 Dan Boschen 22.2k

17

votes

9

answers

5k

views

DSP or signal/image/data processing jokes

image-processing discrete-signals reference-request humor

Jul 26 at 14:50 Marcus Müller 19.9k

16

votes

9

answers

24k

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

16

votes

5

answers

6k

views

Can we break the Shannon capacity?

modulation reference-request channelcoding

Jul 11 '18 at 12:37 Bonny 1

16

votes

6

answers

7k

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

Nov 18 at 19:48 Laurent Duval 25.3k

14

votes

4

answers

5k

views

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

fourier-transform fourier

Jan 5 at 0:57 Fat32 23.8k

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 5,404

14

votes

7

answers

3k

views

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

fourier-transform

Dec 14 '19 at 16:27 hotpaw2 31.4k

13

votes

5

answers

13k

views

what is better: up- or downsampling?

resampling

Oct 2 '19 at 2:18 Dacapi 11

13

votes

6

answers

3k

views

Relation between signal processing and control systems engineering?

control-systems control

Oct 2 '19 at 19:20 Community♦ 1

12

votes

1

answer

3k

views

Fourier transform 4 times = original function (from Bracewell book)

fourier-transform transform fourier

Nov 17 at 11:13 Gilles 2,862

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 16.3k

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

12

votes

5

answers

1k

views

Are there any real world applications for complex-valued signals or impulse responses?

discrete-signals linear-systems complex

Jun 29 at 21:17 Laurent Duval 25.3k

11

votes

4

answers

25k

views

Why is circular convolution used in DSP? Why not linear convolution?

convolution

Jul 7 at 16:07 VMMF 880

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 16.3k

10

votes

2

answers

3k

views

Artifacts in FFT

fft fourier-transform dft

May 21 '13 at 20:21 niaren 1,838

10

votes

3

answers

2k

views

Implementation of Wikipedia Equation for the DFT

fourier-transform python dft

Jan 16 '20 at 22:00 Nimitz14 199

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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?

Terminology: spectrum, spectrogram, spectrograph, sonogram, etc

A good textbook for designing signal filters

Efficient Magnitude Comparison for Complex Numbers

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?

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

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

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

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

what is better: up- or downsampling?

Relation between signal processing and control systems engineering?

Fourier transform 4 times = original function (from Bracewell book)

What Approximation Techniques Exist for Computing the Square Root?

What do the filter coefficients in a digital filter represent?

Are there any real world applications for complex-valued signals or impulse responses?

Why is circular convolution used in DSP? Why not linear convolution?

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

Artifacts in FFT

Implementation of Wikipedia Equation for the DFT