User Spacey

116 votes

12 answers

99k views

What is the physical significance of negative frequencies?

asked Oct 15, 2011 at 19:41

31 votes

5 answers

20k views

"Complex sampling" can break Nyquist?

asked Nov 20, 2011 at 5:12

24 votes

6 answers

27k views

What Is the Walsh Hadamard Transform? How Could One Use It in Image Processing?

asked Mar 12, 2012 at 6:33

22 votes

2 answers

6k views

Examples of Independent and uncorrelated data in real-life, and ways to measure/detect them

asked Jan 26, 2012 at 18:12

21 votes

2 answers

8k views

Does using the Goertzel algorithm actually give better frequency resolution?

asked Mar 9, 2012 at 21:47

19 votes

2 answers

2k views

What Does Make an Error Surface Convex? Is It Determined by the Covarinace Matrix or the Hessian?

asked May 14, 2012 at 17:00

17 votes

2 answers

698 views

What image-processing techniques are ideal for this particular shift/scale invariant template matching?

asked Mar 13, 2012 at 0:16

16 votes

1 answer

7k views

How to estimate and compensate for doppler shift in wireless signals?

asked Oct 14, 2011 at 15:16

15 votes

5 answers

8k views

Is up-sampling prior to cross-correlation useless?

asked May 8, 2012 at 18:03

14 votes

1 answer

2k views

On using eigenvectors to estimate a signals' fundamental frequency, via MUSIC

asked May 26, 2012 at 23:39

14 votes

1 answer

1k views

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

asked Oct 26, 2011 at 20:18

13 votes

1 answer

1k views

How does ICA handle inevitable delays in signals?

asked Jan 9, 2012 at 7:17

13 votes

3 answers

23k views

What is the bandwidth of a (real) sinusoidal tone, and pulse?

asked Jun 30, 2012 at 20:46

12 votes

4 answers

16k views

How to 'whiten' a time domain signal?

asked Nov 11, 2011 at 17:22

12 votes

2 answers

643 views

What methodology to use for discrimination of different (musical?) tones

asked Feb 16, 2012 at 17:36

12 votes

2 answers

4k views

What statistic is used to determine presence of a signal in noise?

asked Apr 19, 2012 at 1:08

11 votes

2 answers

268 views

On the de-noising of time-frequency images

asked May 4, 2012 at 1:01

11 votes

1 answer

2k views

What is the difference between normalized peak of correlation, versus peak of correlation divided by its average?

asked Mar 9, 2012 at 18:46

11 votes

2 answers

442 views

What is the difference between 'de-noising' and what we commonly know as filtering methods to remove noise?

asked Dec 2, 2011 at 18:17

11 votes

3 answers

22k views

What is meant by "spectral moment"?

asked Feb 6, 2012 at 23:00

10 votes

1 answer

1k views

General questions on the CMA equalizer

asked Nov 18, 2011 at 4:31

10 votes

1 answer

760 views

What are thoughts on best modulation to use for underwater acoustic communications at low frequencies?

asked Oct 31, 2011 at 16:35

9 votes

1 answer

3k views

Question on covariance matrix of 2 spatial signals

asked Jan 2, 2012 at 19:30

9 votes

1 answer

6k views

Scalogram (and related nomenclatures) for DWT?

asked Jan 24, 2013 at 17:04

9 votes

1 answer

2k views

Difference between 'conventional' and 'adaptive' beamformers?

asked Feb 12, 2013 at 19:05

8 votes

3 answers

2k views

What is the ideal FIR length, given a specific pulse length?

asked Nov 30, 2012 at 3:29

8 votes

1 answer

321 views

What is Super Resolution in the Context of Windowing?

asked Aug 1, 2012 at 21:54

8 votes

2 answers

4k views

Confirmation on how to calculate phase differences at every frequency point between two wideband signals?

asked Jan 12, 2012 at 1:22

8 votes

2 answers

4k views

How to estimate the number of taps needed for subsequent channel estimation algorithms?

asked Sep 23, 2011 at 20:58

8 votes

2 answers

8k views

How are time resolution and signal bandwidth related?

asked Oct 15, 2011 at 19:56

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50 Questions

What is the physical significance of negative frequencies?

"Complex sampling" can break Nyquist?

What Is the Walsh Hadamard Transform? How Could One Use It in Image Processing?

Examples of Independent and uncorrelated data in real-life, and ways to measure/detect them

Does using the Goertzel algorithm actually give better frequency resolution?

What Does Make an Error Surface Convex? Is It Determined by the Covarinace Matrix or the Hessian?

What image-processing techniques are ideal for this particular shift/scale invariant template matching?

How to estimate and compensate for doppler shift in wireless signals?

Is up-sampling prior to cross-correlation useless?

On using eigenvectors to estimate a signals' fundamental frequency, via MUSIC

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

How does ICA handle inevitable delays in signals?

What is the bandwidth of a (real) sinusoidal tone, and pulse?

How to 'whiten' a time domain signal?

What methodology to use for discrimination of different (musical?) tones

What statistic is used to determine presence of a signal in noise?

On the de-noising of time-frequency images

What is the difference between normalized peak of correlation, versus peak of correlation divided by its average?

What is the difference between 'de-noising' and what we commonly know as filtering methods to remove noise?

What is meant by "spectral moment"?

General questions on the CMA equalizer

What are thoughts on best modulation to use for underwater acoustic communications at low frequencies?

Question on covariance matrix of 2 spatial signals

Scalogram (and related nomenclatures) for DWT?

Difference between 'conventional' and 'adaptive' beamformers?

What is the ideal FIR length, given a specific pulse length?

What is Super Resolution in the Context of Windowing?

Confirmation on how to calculate phase differences at every frequency point between two wideband signals?

How to estimate the number of taps needed for subsequent channel estimation algorithms?

How are time resolution and signal bandwidth related?