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7

votes

5

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2k

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Can someone help explain what this FFT workflow is doing to my signal, and why it works?

fft

modified Oct 22 at 15:09 TimWescott 366

7

votes

4

answers

1k

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Are all LTI systems invertible? If not, what is a good counterexample?

linear-systems inverse-problem

modified Nov 11 at 20:37 TimWescott 366

4

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3

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1k

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How do impulse response guitar amp simulators work?

audio convolution impulse-response audio-processing

modified yesterday Dan Szabo 354

3

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4

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813

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Noise reduction using multiple recordings of the same signal

audio noise denoising audio-processing noise-cancellation

modified Oct 21 at 15:18 Peter K.♦ 17.8k

2

votes

2

answers

393

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The spectrum of the sum of two periodic signals

frequency-spectrum linear-systems

modified Oct 23 at 18:37 Olli Niemitalo 10k

4

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3

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132

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The z factor in polyphase decomposition

polyphase

modified Nov 11 at 14:25 MBaz 9,748

2

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3

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255

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I don't understand harmonics, why do they happen?

fft

answered 14 hours ago Paul DeRocco 11

3

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4

answers

101

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Layman Description of the Kalman Filter

image-processing filters kalman-filters control-systems bayesian-estimation

answered Oct 25 at 18:56 Izzo 558

3

votes

3

answers

209

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I somehow “proved” that given any LTI system, its transfer function has to be constant. What am I missing?

linear-systems

modified Nov 6 at 11:09 Matt L. 55.9k

4

votes

1

answer

221

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Why the unilateral Laplace transform?

fourier-transform laplace-transform

modified Nov 6 at 13:18 Matt L. 55.9k

2

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4

answers

101

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What Information Is Lost by Histogram Equalization?

image-processing equalization histogram

modified Oct 27 at 0:17 Fat32 19.2k

2

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2

answers

98

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Why ideal filter cannot realised practically?

filters

modified Nov 10 at 13:23 Laurent Duval 19.5k

1

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2

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141

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Finite impulse response FIR filters

fir homework

modified Oct 27 at 9:04 Marcus Müller 13.8k

1

vote

3

answers

65

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Why is the median of a PDF not always equal to the mean? [closed]

probability probability-distribution-function

modified Oct 17 at 19:05 Laurent Duval 19.5k

1

vote

2

answers

55

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Digital PLL loses lock every time mesage crosses zero

synchronization pll

modified Oct 22 at 21:25 Ben 1,270

2

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1

answer

186

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Statistic that is responsive to changes in time series, yet not too volatile

time-series

modified Oct 28 at 7:28 mark leeds 783

0

votes

3

answers

68

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Impulsive autocorrelation sequence

autocorrelation

answered Oct 29 at 3:35 Dilip Sarwate 14.7k

2

votes

2

answers

100

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The Fourier transform of a damped cosine and the units of the result

fourier-transform power-spectral-density

answered Nov 10 at 22:56 Fat32 19.2k

3

votes

2

answers

55

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Idea for Noise Level Estimation / Automatic Thresholding in the Presence of Peaks

noise algorithms estimation frequency-domain

modified Oct 22 at 10:52 Royi 9,778

1

vote

2

answers

62

views

How to generate random data with a specific bandwidth

digital-communications bandwidth

answered Oct 17 at 19:42 MBaz 9,748

1

vote

1

answer

62

views

Is it impossible to determine the inverse Z-transform without any other information?

discrete-signals z-transform transfer-function

modified Nov 9 at 14:59 Matt L. 55.9k

2

votes

2

answers

94

views

What is the autocorrelation of a Dirac pulse?

signal-analysis continuous-signals autocorrelation pulse

modified Oct 22 at 22:28 Laurent Duval 19.5k

3

votes

1

answer

70

views

How to Linearly Combine Two Unbiased Estimators of One Parameter without Knowledge of Their CoVariance?

estimation parameter-estimation probability

modified Oct 20 at 7:55 Royi 9,778

1

vote

2

answers

54

views

why do directional derivatives work better with a gaussian filter?

image-processing filters edge-detection

modified 1 hour ago Laurent Duval 19.5k

3

votes

2

answers

53

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Losslessness of Laplacian Pyramid

image-processing computer-vision scale-space multi-scale-analysis

modified Oct 21 at 3:54 Laurent Duval 19.5k

1

vote

1

answer

53

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sum of 2 signals

digital-communications bandwidth

modified Oct 31 at 10:54 Hilmar 12.5k

0

votes

2

answers

47

views

STFT window width vs. detectable Hz range

fft stft

modified Oct 26 at 17:37 JoleT 142

1

vote

1

answer

59

views

Complex output after inverse FFT of a real signal

matlab fourier-transform denoising deconvolution

modified Oct 18 at 15:37 Laurent Duval 19.5k

2

votes

1

answer

54

views

Deriving the Langrangian interpolation polynomials in Cook-Toom convolutions

convolution cross-correlation interpolation neural-network polynomial

modified Nov 4 at 14:39 Matt L. 55.9k

3

votes

0

answers

113

views

Converting an FIR Filter Model to a State Space Model for Kalman Filtering

fir kalman-filters state-space

modified Oct 18 at 12:29 Rodrigo de Azevedo 591

4

votes

1

answer

83

views

Use recursive least square as an “actual” filter?

filters filter-design lowpass-filter adaptive-filters least-squares

modified Oct 31 at 16:38 fibonatic 684

5

votes

1

answer

63

views

Transfer function and deconvolution

fourier-transform deconvolution reference-request wiener-filter

modified Nov 9 at 8:18 jlandercy 151

1

vote

1

answer

60

views

When calculating SNR, is noise included in signal?

sampling snr digital analog

answered Oct 16 at 22:00 MBaz 9,748

0

votes

1

answer

60

views

Is it possible to reduce the complexity of radix-2 FFT if the input vector contains identical elements?

fft fourier-transform dft

modified Oct 23 at 16:23 mfcc64 86

1

vote

1

answer

76

views

Understanding Fourier Transforms in abstract math terms

fourier-transform python algorithms fourier-series numerical-algorithms

modified 2 days ago rocksNwaves 121

1

vote

1

answer

45

views

What is the time reversal convolution

matlab discrete-signals autocorrelation correlation

answered Nov 9 at 8:41 Richard Lyons 2,385

3

votes

1

answer

44

views

How do I interpret this block diagram correctly?

filters filter-design digital-filters

modified Oct 18 at 1:45 user45720 1

2

votes

2

answers

44

views

How to detect real time sound onsets?

python sound real-time

modified Nov 4 at 1:01 hotpaw2 29k

1

vote

1

answer

43

views

Convolution Integral of Harmonic Signal (Cosine) with the Sinc Function

signal-analysis convolution integration sinc

modified Oct 16 at 18:49 Royi 9,778

3

votes

1

answer

53

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Square wave FFT results show frequency that seems too low?

fft signal-analysis python

answered Oct 17 at 9:19 kippertoffee 351

0

votes

1

answer

84

views

Problem converting from Eb/N0 to SNR

noise

modified Oct 26 at 11:01 researcher9 143

1

vote

1

answer

50

views

Scaling Function in Wavelet Analysis

filters frequency-spectrum frequency wavelet

modified Oct 23 at 21:16 Laurent Duval 19.5k

2

votes

1

answer

50

views

Reduce noise of sensor by combining two

noise cross-correlation sensor noise-cancellation

modified Nov 1 at 7:38 Laurent Duval 19.5k

0

votes

1

answer

64

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Orthogonal Basis for a 2D Signals (Compressive Sensing)

fourier-transform dft compressive-sensing linear-algebra

modified Oct 20 at 12:42 AIJAZ BHAT 19

0

votes

1

answer

37

views

Why does a strange frequency appear in this image?

filters spectrogram

modified Oct 24 at 18:31 hotpaw2 29k

1

vote

2

answers

57

views

The sum part of the formula for a signals power

discrete-signals signal-analysis signal-power

modified Nov 10 at 12:40 Laurent Duval 19.5k

0

votes

4

answers

57

views

concatenating short noise sequences

matlab audio

modified 2 days ago Olli Niemitalo 10k

1

vote

2

answers

44

views

How to visualize high-pass filtered images?

fourier-transform highpass-filter visualization

modified Oct 23 at 22:17 Fat32 19.2k

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