Hottest Questions This Month

1

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994

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Does the Shannon theorem not apply when the amplitude of a wave is changed faster than half the time period of the wave?

sampling nyquist

answered May 4 at 8:18 osillyscope 21

10

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5

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586

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A DFT “periodic inputs” question

signal-analysis frequency-spectrum

modified Apr 27 at 2:57 Dan Boschen 25.1k

2

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1

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923

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CD quality bitrate

audio

modified May 7 at 8:22 Justme 1,213

4

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4

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109

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Why is phase range between $-\pi$ and $+\pi$ (instead of $0$ and $2\pi$)?

digital-communications digital synchronization software-defined-radio

modified May 2 at 13:16 robert bristow-johnson 15.1k

4

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2

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279

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Geometric representation of a signal using basis functions

signal-analysis digital-communications orthogonal-signals orthornormal

modified Apr 26 at 20:18 Laurent Duval 26.8k

2

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2

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587

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Is there a physical reason why phase should be uniformly distributed?

phase

modified Apr 30 at 15:44 V.V.T 1,197

1

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3

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214

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Filter odd or even harmonics with notch or inverse notch filter

z-transform transfer-function digital-filters bandpass inverse

modified May 10 at 21:19 Dan Boschen 25.1k

2

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3

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78

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Why must the order of a Band-Pass and Notch filter always be even?

matlab filter-design digital-filters bandpass bilinear-transform

modified Apr 26 at 21:35 Richard Lyons 3,697

4

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2

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175

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signal of $\frac{1}{f}$ Noise

noise power-spectral-density

modified May 1 at 19:53 Mardy Owens 400

2

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4

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114

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$\int_{-\infty}^{+\infty} |G(f)| \,e^{j2\pi ft}df=|g(t)|$?

fourier-transform continuous-signals

modified 2 days ago MimSaad 1,702

3

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4

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137

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Amplitude of the fft is less than what is expected

fft amplitude tone-generation

answered 2 days ago David 2,471

4

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2

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148

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Accurate phase calculation in sinusoidal linear regression?

fft phase feature-extraction

modified Apr 29 at 16:34 Cifer 41

2

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3

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146

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Seamless looping of a signal without pops

audio interpolation

answered 10 hours ago TimWescott 4,568

1

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2

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177

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Where to start with DSP?

linear-systems z-transform frequency-response fourier time-domain

answered Apr 27 at 18:14 TimWescott 4,568

4

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3

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168

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How to find peak value of an analog signal efficiently after sampling in the digital domain?

sampling interpolation analog-to-digital

modified May 7 at 5:34 Dan Boschen 25.1k

5

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2

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96

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What are the restrictions on DFT input sequences in order to produce valid spectral results

signal-analysis

modified Apr 28 at 18:45 OverLordGoldDragon 1,083

2

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1

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74

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Does $\cos(bt)\cdot u(t)$ have a Fourier Transform?

fourier-transform continuous-signals homework

answered Apr 23 at 11:52 Matt L. 73.8k

3

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2

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103

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Why does Matlab spectrogram look stripy when windowed input is zero-padded?

matlab spectrogram window-functions short-time-ft zero-padding

answered Apr 28 at 12:32 Laurent Duval 26.8k

0

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3

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146

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There is an implant in me, is there a way to identify the frequency it is receiving signals on?

signal-analysis audio signal-detection

answered May 3 at 3:29 robert bristow-johnson 15.1k

3

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2

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76

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periodic noise detection in image's frequency domain

image-processing fft noise

modified yesterday Bob 732

2

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3

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97

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Implementation of CIC filter using floating point

filter-design decimation fixed-point polyphase floating-point

modified May 5 at 16:28 Dan Boschen 25.1k

2

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2

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66

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Recommendation for courses / studies on digital signal processing

filter-design kalman-filters machine-learning self-study

answered May 1 at 20:23 TimWescott 4,568

1

vote

1

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81

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Envelop detection using matlab hilbert function

matlab filters signal-analysis hilbert-transform

modified Apr 24 at 11:02 Dan Boschen 25.1k

3

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1

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101

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Relation between probability of a signal and its magnitude spectrum

power-spectral-density probability

modified May 8 at 16:24 Marcus Müller 21.8k

2

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2

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36

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Simple Image Edge Preserving Filter

image-processing filters computer-vision edge-preserving-filter

answered Apr 23 at 23:21 Royi 20.3k

1

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3

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94

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On what it means for a system to be minimum phase

filters discrete-signals filter-design minimum-phase

answered May 12 at 6:50 telemeister 66

1

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1

answer

154

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Extremes of integral of the autocorrelation theorem

frequency-spectrum autocorrelation

answered Apr 22 at 20:35 Mardy Owens 400

1

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1

answer

114

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Allan Variance vs Autocorrelation - Advantages

noise power-spectral-density autocorrelation stability oscillator

modified May 10 at 13:16 Dan Boschen 25.1k

2

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3

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83

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Why would a time shifted signal have a higher maximum frequency than an unshifted one?

fft signal-analysis frequency-spectrum

modified 20 hours ago V.V.T 1,197

1

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2

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45

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Understanding why (at least) 2 points of the FFT of a real signal are real

fft

answered 18 hours ago Marcus Müller 21.8k

1

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1

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54

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Calculation of inverse impulse response in the frequency domain

filters fourier-transform frequency-response impulse-response

answered May 11 at 12:55 Matt L. 73.8k

0

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1

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51

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Why is $x[n]=\sin(\frac{12\pi n}{5})-\sin(\frac{2\pi n}{5})=0$

discrete-signals periodic

answered May 10 at 14:08 Matt L. 73.8k

0

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2

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64

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FFT of square wave - what does output represent?

fft fourier-transform continuous-signals fourier-series

modified Apr 27 at 1:23 ZR Han 804

1

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1

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82

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Phase locked loop for three phase grid

analog-to-digital c integration pll

modified May 12 at 13:27 Ben 3,090

3

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1

answer

81

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Error probability for orthogonal signaling with unequal symbol probabilities

signal-analysis digital-communications modulation

modified 2 days ago Dilip Sarwate 17.2k

2

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1

answer

61

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Why is particular solution zero for an impulse excitation signal?

linear-systems impulse-response differential-equation

modified Apr 29 at 13:06 Matt L. 73.8k

3

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1

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47

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Digital demodulator (SDR) for receiving legacy analog modulated wave

digital-communications sdr polar

modified Apr 17 at 23:26 DevBee 33

1

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2

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74

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Under what conditions is the convolution of an input signal with the system's impulse response periodic?

convolution continuous-signals linear-systems

modified Apr 18 at 17:01 Laurent Duval 26.8k

1

vote

2

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74

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How to generate a noise like Pioneers white noise?

audio

modified Apr 28 at 8:07 mmmm 119

2

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4

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57

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Meaning of frequency and bandwidth of a signal, despite the fact that we do not know the signal

fourier-transform frequency-spectrum continuous-signals bandwidth voice

modified 2 days ago OverLordGoldDragon 1,083

0

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2

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44

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Convolution Reverb Calculation

fft convolution finite-impulse-response ifft

answered Apr 25 at 16:00 Hilmar 21.3k

-2

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2

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72

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What is the formula to calculate the frequency response?

matlab python dsp-core

modified Apr 17 at 17:54 Dan Boschen 25.1k

4

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2

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43

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How to Calculate Local Spatial Variance of an Image?

image-processing matlab statistics background-subtraction

modified Apr 24 at 9:43 Royi 20.3k

1

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1

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91

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Impulse response for an LTI system

linear-systems impulse-response step-response

modified Apr 19 at 0:02 Fat32 24.9k

2

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1

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69

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Frequency-domain deconvolution: “Direct” filtering vs “Wiener” filtering

frequency-domain deconvolution least-squares

modified Apr 21 at 3:56 lennon310 3,430

-1

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2

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112

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How do I make a two pole filter with resonance

lowpass-filter

answered 2 days ago Edward Eddy67716 11

1

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2

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52

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How to smooth the echo duration change to get rid of audio clicks?

audio

answered Apr 23 at 2:00 robert bristow-johnson 15.1k

4

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1

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39

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Does a power spectral density that follow a power law imply that the time hisory follows a power law?

power-spectral-density power-law

answered Apr 27 at 13:23 Hilmar 21.3k

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