Hottest Questions This Month

9

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6

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4k

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

modified 2 hours ago Laurent Duval 18.3k

15

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4

answers

4k

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

fourier-transform fourier

modified Aug 9 at 10:37 Laurent Duval 18.3k

4

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4

answers

624

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Is Fourier series a sampled version of Fourier transform?

fourier-transform sampling continuous-signals fourier-series

modified Aug 16 at 19:50 Matt L. 53.7k

1

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2

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909

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How do I explain a complex exponential intuitively?

discrete-signals fourier-transform audio

modified Jul 30 at 15:00 Cedron Dawg 3,905

7

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4

answers

750

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reconstruction filter - How does it actually work?

nyquist reconstruction digital-to-analog

modified Aug 1 at 14:06 Olli Niemitalo 9,268

5

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2

answers

287

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Basic Questions on Wiener Filtering

transfer-function wiener-filter

modified Jul 29 at 13:47 Duck Dodgers 141

2

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2

answers

156

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Numerically Stable IIR filter

filters filter-design infinite-impulse-response digital-filters bandpass

answered Aug 1 at 16:28 Hilmar 11.9k

1

vote

3

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129

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How can I know if these two signal are orthogonal to each other

continuous-signals orthogonal-signals

modified Aug 17 at 10:05 Laurent Duval 18.3k

2

votes

2

answers

125

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How would you interpret the pattern in this picture? (generated by re-sorting pixels based on their RGB value)

image-processing filters filter-design sampling computer-vision

modified Aug 16 at 6:28 Olli Niemitalo 9,268

0

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2

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89

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Intermittent Harmonics, Is there a physical explanation?

fft periodic nonharmonic

modified Aug 13 at 12:28 Fat32 17.8k

0

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3

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56

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Analyzing a signal that contains frequency content at Fs/2 doesn't seem to work unless there is a phase shift

fft sampling python phase

answered Jul 30 at 16:09 Machupicchu 321

2

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2

answers

92

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Sinc interpolation in spatial domain

fourier-transform interpolation

answered Aug 18 at 17:47 Fat32 17.8k

3

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1

answer

85

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Which Noise Reduction Algorithms Are Used in Commercial RAW Image Processors?

image-processing noise estimation denoising photo

modified Aug 18 at 2:57 Royi 8,525

2

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2

answers

69

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How to apply discrete filters to a signal

discrete-signals filtering

modified Aug 1 at 15:51 Jonas Schwarz 424

2

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4

answers

66

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LTI system and initial conditions

discrete-signals linear-systems theory

answered Aug 9 at 5:16 Huitzyl 54

0

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2

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69

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All-pass filter usage in automotive room correction

filters fir

modified Aug 5 at 15:57 Peter K.♦ 17.5k

1

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2

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65

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Is the FFT magnitudes of multiple audio sources additive?

fft fourier-transform

answered Jul 31 at 16:55 hotpaw2 26.8k

1

vote

2

answers

61

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Why the following discrete type system,variable accumulator, is time invariant?

discrete-signals linear-systems time-domain

modified Aug 4 at 7:44 Faraday Pathak 187

3

votes

1

answer

73

views

Compensating the Group Delay of an Analog Filter using DSP

transfer-function analog group-delay

modified Aug 1 at 9:29 Ben 1,090

1

vote

2

answers

56

views

Does the DFT calculate spectral components up to half the sampling frequency, $f_s/2$?

dft

modified Aug 7 at 12:41 AlexTP 4,620

0

votes

2

answers

55

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Determine the Given system is linear or nonlinear [closed]

discrete-signals homework digital self-study

modified Aug 8 at 6:50 Laurent Duval 18.3k

1

vote

1

answer

42

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How can i know the full duplex does work from the Shannon's theorem?

digital-communications

modified Aug 4 at 9:37 Marcus Müller 13k

1

vote

2

answers

85

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Old style signal processing?

lowpass-filter spectrogram stft bandpass

answered Aug 14 at 2:14 robert bristow-johnson 12k

-1

votes

3

answers

64

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Can the colors of an image be interpreted as “virtual” Doppler effect?

image-processing signal-analysis computer-vision color distance-metrics

modified Aug 17 at 17:01 Olli Niemitalo 9,268

1

vote

2

answers

49

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Is the value of a frequency bin of a DFT-output the average of the 'real' frequency values within that bin's range?

fft signal-analysis dft frequency-domain

modified Aug 9 at 2:01 hotpaw2 26.8k

1

vote

3

answers

80

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Reduce the number of intensity levels of a grayscale image in Matlab

image-processing matlab

modified Aug 22 at 6:21 Kulbhushan Chand 26

0

votes

1

answer

130

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How to remove striped noise from this image. Which filter or algorithm use better?

image-processing matlab discrete-signals computer-vision image

modified 2 days ago Peter K.♦ 17.5k

1

vote

1

answer

46

views

Why is the Hamming and Hanning window the most widely used for speech spectograms?

window-functions speech-processing speech-recognition

modified Aug 4 at 17:44 Stanley Pawlukiewicz 7,182

1

vote

1

answer

53

views

Proof of First Difference Property for Fourier Series

discrete-signals fourier-series

modified Aug 4 at 15:52 Matt L. 53.7k

1

vote

3

answers

87

views

Reverse engineering a digital filter

fft filter-design lowpass-filter digital-filters reverse-engineering

answered Aug 15 at 20:41 Lee Friedman 16

0

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3

answers

65

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Calculating the numerical gradient of a volume in one direction at a time

image-processing matlab gradient

modified Aug 14 at 14:46 Cris Luengo 493

0

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2

answers

83

views

Half Window Functions and Formulas

fft audio window

modified Aug 7 at 18:07 Laurent Duval 18.3k

0

votes

2

answers

46

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Ripples in filter

filter-design

answered Aug 15 at 17:24 hotpaw2 26.8k

0

votes

4

answers

35

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Determining LTI system response to a scale change

fourier-transform convolution continuous-signals linear-systems

modified Aug 19 at 22:59 Fat32 17.8k

0

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2

answers

35

views

Phase information of a signal when creating a spectrogram

fourier-transform audio phase spectrogram

answered Jul 29 at 11:46 Fat32 17.8k

2

votes

1

answer

72

views

What Is the Correct Way to Apply Richarson Lucy Deconvolution to Luminance Data?

image-processing deconvolution digital color photo

modified Aug 11 at 13:53 Royi 8,525

1

vote

2

answers

55

views

Digital Image Processing Textbook with Specific Topics

image-processing image reference-request image-registration books

modified Aug 6 at 17:31 Fat32 17.8k

1

vote

2

answers

54

views

Understanding Pitch Detection with Autocorrelation Methods

sampling autocorrelation pitch

answered Aug 3 at 19:31 robert bristow-johnson 12k

1

vote

1

answer

67

views

Removing breaths using python

filters audio python audio-processing

answered Jul 28 at 17:10 Duck Dodgers 141

1

vote

1

answer

51

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Why would FFT interpolation using zero-padding undershoot the true frequency of a single tone sinusoid?

fft discrete-signals dft interpolation

modified Aug 10 at 21:41 Matt Southwick 8

1

vote

2

answers

39

views

Matlab and R functions for fft(): N-point FFT and dimension issue

fft frequency-spectrum self-study

modified 3 hours ago fina 25

1

vote

1

answer

63

views

What is meant by product of two images?

image-processing

modified Aug 12 at 5:09 Cris Luengo 493

2

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2

answers

80

views

Frequency response of a microphone using a sine sweep

power-spectral-density phase frequency-response estimation magnitude

answered Jul 27 at 16:17 JRE 1,648

0

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2

answers

48

views

Is the typical implementation of low pass filter in C code actually not a typical low pass filter?

filters

answered Aug 22 at 11:31 Jason R 21.6k

0

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1

answer

48

views

Continuous-time vs Discrete-time Fourier transform

discrete-signals fourier-transform dtft

modified Jul 30 at 4:52 robert bristow-johnson 12k

1

vote

3

answers

60

views

Is spectral leakage normal for FFT?

fft aliasing

modified Aug 13 at 19:54 hotpaw2 26.8k

0

votes

0

answers

76

views

Help me understand this filter

filter-design lowpass-filter adaptive-filters

modified Aug 12 at 18:08 Marcus Müller 13k

2

votes

2

answers

46

views

How to reconstruct a sound from magnitude spectrogram?

fourier-transform audio frequency-spectrum

answered Aug 19 at 14:31 Laurent Duval 18.3k

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