User Gilles

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 5,444

54

votes

4

answers

25k

views

Analogous Library to OpenCV for Audio Processing / Analysis

image-processing audio

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87

votes

6

answers

165k

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

fft zero-padding

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24

votes

2

answers

8k

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Extracting Binary Magnetic-Strip Card Data from raw WAV

digital-communications demodulation

May 3 '14 at 1:52 Community♦ 1

34

votes

7

answers

6k

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What is the most lucid, intuitive explanation for the various FTs - CFT, DFT, DTFT and the Fourier Series?

fourier-transform fourier-series

Jun 23 at 11:03 auspicious99 228

14

votes

3

answers

642

views

How to efficiently calculate only the low coefficients of a zero-padded FFT

fft dft

Nov 11 '11 at 7:02 hotpaw2 31.6k

12

votes

3

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2k

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Is it numerically more stable to implement filtering as multiplication or convolution?

filters

Nov 7 '11 at 13:13 Hilmar 8,982

78

votes

4

answers

207k

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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

47

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5

answers

9k

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Point Pattern Recognition

image-processing computer-vision image-registration

May 27 '18 at 23:32 Geoff 11

13

votes

1

answer

1k

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What are the various definitions for $\rm SNR$, and their associated methods for measuring it?

noise bpsk snr

Aug 19 '16 at 8:08 Community♦ 1

56

votes

8

answers

7k

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What are some good signal and image processing blogs worth following?

image-processing

Apr 6 '17 at 20:14 MimSaad 1,662

96

votes

9

answers

79k

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What is the physical significance of negative frequencies?

frequency

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32

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4

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43k

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Hilbert transform to compute signal envelope?

audio

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178

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63k

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“River” detection in text

image-processing

May 27 '15 at 20:27 Community♦ 1

41

votes

6

answers

5k

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What Properties Make Certain Wavelets “Better” Than Others In Image Compression?

image-processing wavelet

Aug 28 '16 at 0:26 Laurent Duval 25.7k

17

votes

2

answers

10k

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Is a Kalman filter suitable to filter projected points positions, given Euler angles of the capturing device?

filters kalman-filters state-space

Feb 4 '15 at 17:45 Community♦ 1

19

votes

3

answers

983

views

Should the input of a Kalman filter always be a signal and its derivative?

filters adaptive-filters kalman-filters

Feb 2 '15 at 6:57 wayne 175

48

votes

5

answers

65k

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What is the difference between phase delay and group delay?

filters audio phase group-delay

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15

votes

2

answers

7k

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What distance metric can I use for comparing images?

image-processing distance-metrics

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26

votes

5

answers

3k

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When is aliasing a good thing?

sampling bandpass

Sep 17 '11 at 20:29 Community♦ 1

21

votes

3

answers

9k

views

How to implement a digital oscillator?

software-implementation oscillator

Dec 6 '19 at 22:06 natevw 155

27

votes

2

answers

4k

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Are there alternatives to the bilinear transform?

continuous-signals discrete-signals transfer-function

Nov 15 '12 at 17:17 Community♦ 1

26

votes

1

answer

9k

views

What is meant by “stochastic sampling”?

sampling

Aug 23 '11 at 18:09 Lorem Ipsum 5,444

33

votes

5

answers

4k

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What factors should I consider in choosing an edge detection algorithm?

algorithms image-processing edge-detection

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134

votes

8

answers

152k

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Why is the Fourier transform so important?

fourier-transform

Jul 31 '18 at 21:11 Community♦ 1

34

votes

4

answers

12k

views

What are good ways to detect signal clipping in a recording?

audio algorithms

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16

votes

5

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What factors should I consider when choosing an IIR filter realization?

filters infinite-impulse-response

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12k

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How do I interpret the DCT step in the MFCC extraction process?

filters mfcc cepstral-analysis

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952

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analytic-signal preprocessing estimators

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84

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4

answers

69k

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What is the difference between a Fourier transform and a cosine transform?

dct dft

Sep 30 '18 at 15:46 Community♦ 1

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

Analogous Library to OpenCV for Audio Processing / Analysis

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

Extracting Binary Magnetic-Strip Card Data from raw WAV

What is the most lucid, intuitive explanation for the various FTs - CFT, DFT, DTFT and the Fourier Series?

How to efficiently calculate only the low coefficients of a zero-padded FFT

Is it numerically more stable to implement filtering as multiplication or convolution?

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

Point Pattern Recognition

What are the various definitions for $\rm SNR$, and their associated methods for measuring it?

What are some good signal and image processing blogs worth following?

What is the physical significance of negative frequencies?

Hilbert transform to compute signal envelope?

“River” detection in text

What Properties Make Certain Wavelets “Better” Than Others In Image Compression?

Is a Kalman filter suitable to filter projected points positions, given Euler angles of the capturing device?

Should the input of a Kalman filter always be a signal and its derivative?

What is the difference between phase delay and group delay?

What distance metric can I use for comparing images?

When is aliasing a good thing?

How to implement a digital oscillator?

Are there alternatives to the bilinear transform?

What is meant by “stochastic sampling”?

What factors should I consider in choosing an edge detection algorithm?

Why is the Fourier transform so important?

What are good ways to detect signal clipping in a recording?

What factors should I consider when choosing an IIR filter realization?

How do I interpret the DCT step in the MFCC extraction process?

How should I pre-process a real valued signal in order to use Kay's estimator?

What is the difference between a Fourier transform and a cosine transform?