Questions tagged [signal-detection]

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108 views

Detecting special points in signal

What tool/filter/mathematic operation would you use to detect the red points marked in this signal? As you can see there are several differentiated groups and I want to detect those moments in which ...
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0answers
457 views

What is the best algorithm to detect leading edge?

I am interested to detect leading edge of one dimensional signal. There may be several algorithm for edge detection, specially for image processing (2 dimensional), but my interest is on one ...
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0answers
67 views

General question on signal processing guidelines for emergency shutdown applications (i.e. medical devices)

Disclaimer This might be a very broad question. I ask it out of curiosity, because the topic came up in a discussion lately. Hence, I do not have any specific applications or even data that I could ...
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0answers
46 views

How do I correctly receive a signal using a signal analyzer?

For the past few weeks, I have been trying to send a Zaddof Chu signal using a vector signal generator, and receive it using a signal analyzer. Both devices are made by R&S. However, the signal ...
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0answers
78 views

Heterodyne detection

Prove that with appropriate choices of the phase $\varphi$, one can recover the quadratures of $m(t).$ Attempt The context of this question is weak optical signals combined with a strong local ...
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0answers
88 views

processing photo diode array data

We have designed a system which has an 8X8 array of photo diodes, we sense 10ns pulses of laser falling on those photo diodes with a repetetion rate of maximum 50Khz i.e. 20us, we were successfully ...
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0answers
96 views

Application of BIC, MDL, AIC

I understand that mathematical motivation behind Bayesian Information Criterion (BIC), Minimum description length (MDL), Akaike information criterion (AIC) are different but I am assuming that there ...
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1answer
88 views

Find tracing/plotting stacked bands/lines in an image

I have images with lines/bands, the bands/lines are parallel but can be of different gray levels, I want to extract or trace the lines/bands as single line, all lines/bands are parallel. Source: ...
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0answers
38 views

Variation in Signal Power in Mimo system

I am exploring methods for reducing computations required by MUSIC (Multiple Signal Classification) Algorithm. Most of the computational power is spent on calculating SVD. My approach is to take ...
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0answers
58 views

determining walsh function components of signal after passing through non linear process

When a sum of sine waves is passed through a non linear process, harmonics and intermodulation distortion products are created, which are visible when applying an FFT to the signal. This causes ...
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0answers
311 views

Train Pulse Recognition in Medium Voltage Networks

I just started a project in the Smart Grids area. It involves the recognition and quick extinction of earth faults in a medium voltage system. The system works automatically and pretty much gets rid ...
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0answers
127 views

White Gaussian Noise: a reality or fantasy? [duplicate]

White noise has infinite variance, whereas Gaussian random variable must have some finite-variance to exist. How do two disjoint phenomena co-exist? Help will be highly appreciated.
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0answers
172 views

how to detect the center frequency of a QRS complex in an ECG signal?

i want to design a filter that can effectively detect the QRS complex in ECG signal(whose Fs=360Hz) and reduce high frequency noise components. i want to know as to how the center frequency is ...
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2answers
74 views

suppose if we send AM modulated message signal through space how the receiver will be knowing that we applied AM modulation?

suppose if we send AM modulated message signal through space how the receiver will be knowing that we applied AM modulation basically how it will be knowing that which modulation is applied for our ...
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5answers
116 views

How Can Telecommunication System Know Which Part Is Signal and Which Is Noise? [closed]

When signal is received how can receiver know which part of received signal is signal and which part is noise??
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3answers
122 views

best technique to remove noise from bio signal data

I'm still learning about signal processing so sorry if this is an intro problem. I want to remove noise from the following data so I can separate each wave and run analysis on it. The data is sampled ...
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1answer
363 views

Question about the Haar Wavelet transform

I'm trying to detect the presence of a sinusoid in 1/f noise conditions using the STFT and the DWT with Haar wavelets. I find this interesting phenomenon that I'm not able to explain (see plot at 1) ...
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1answer
42 views

Advantages and disadvantages of multiplying sparse vector with sparse matrix

Assume I have a sparse vector $x$ whose few values are non-zeros, that vector is multiplied with sparse unitary matrix $Y$ giving $z = Yx$. Are there any advantages of detecting the sparse vector $x$ ...
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1answer
105 views

What are the limitations of using Magnetic induction rather than acoustic communication in underwater communication

In underwater environment, Why acoustic underwater communications are still famous more than magnetic induction communication however in magnetic induction underwater communication, higher data rate ...
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2answers
471 views

Detection of sharp peaks in an audio signal

I have an audio signal and I'm interested to detect the very sharp peaks. If I zoom, here is something that should NOT be detected (this is voice actually): NO GOOD Here is something that should be ...
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2answers
326 views

Homodyne and heterodyne detection

Very basic question here. I searched it on the net but cudn't get very convincing answers. Can anyone explain me Homodyne and Heterodyne detections in rf domain. Mathematically is much appreciated.
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1answer
43 views

Detecting level in a Pulse Train

Assume I have a square wave pulse train, where each high lasts for H and each low lasts for L seconds. I sample this waveform and have the sequence of numbers. Question is what should be the sampling ...
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3answers
975 views

Expectation of deterministic signals

Maybe this a stupid question, but I came along with this point and I would like to confirm that I am not wrong. I found some similar posts in StackExchange, like: Expectation and Auto-correlation of ...
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1answer
96 views

Advantages of Splines in Compressed sensing

I am working in compressed sensing, basically in ECG reconstruction Normally we were using biorthogonal wavelets for reconstruction. Someone advised me to use exponential spline basis instead of ...
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4answers
1k views

Can Morse Code be encoded using “silence” for dots and dashes?

Morse code dots and dashes are often displayed as a sound, or light that is on for a short or long period of time. What if the only way to communicate was by knocking.... (or similar encoding) that ...
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1answer
90 views

DSP based FMCW radar

I have an SDR receiver I'm interested in making into a FMCW radar. The bandwidth is somewhat narrow as it only samples at 64 MSPS. There is a problem in that without a bunch of embedded programming ...
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4answers
52 views

Signal analysis: selection of oscillatory parts

I'm trying to analyze the following signal: My aim is to select the high-amlitude oscillation parts limited by the red stars. At the beginning, i have tried to set a threshold and keep only the ...
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1answer
49 views

What is full scale?

I read the Wikipedia documentation and it's not clear to me what is the full scale concept. What is the meaning of changing the full scale? How I can preserve data in that scale?
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1answer
436 views

Carrier Recovery, Frequency and Phase offset in (CP)FSK

I wanted to ask what exactly is meant for phase recovery of signal (at least intuitively). I have a working example of an acoustic fsk modulation and demodulation software but i don't know how to ...
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2answers
416 views

Optimum Filter Signal Detection for Non AWGN Channels

I have been reading this question and it confirms that the matched filter is the maximum-likelihood receiver in the presence of additive white Gaussian noise. So in the AWGN channel it maximizes the ...
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1answer
722 views

How the noise in time domain affect the power in frequency domain after FFT?

I am new to signal processing. And I am puzzled when studying FFT. I create time series plus a random noise in Python: ...
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1answer
289 views

coding gain and shaping gain in SCMA

It is said that sparse code multiple access (SCMA) has the advantage of higher shaping and coding gain over LDS-CDMA due to the multidimensional constellation. What exactly is the shaping gain and how ...
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1answer
599 views

How can i measure soundcard latency?

I want to write sonar/radar like sample application. For sake of simplicity (and not to use Arduino and specialized RTOS) - I simply used using audio in/out analog ports of a motherboard integrated ...
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1answer
122 views

How to detect the singular value with signal processing technology?

I have a signal like ...
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2answers
69 views

Sphere decoding for non-binary modulation

I have a simple question on how to implement SD for non-binary modulation, let say QPSK. Assume we transmit a complex symbol $\overline{a}$ drawn from a QPSK constellation. On a vector form, we can ...
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1answer
40 views

How to calculate a significant value of a definite curve/shaded region in a graph?

The attached graph below consists of $4.5$ seconds of pattern which I have recorded via a hardware device. The $x$-axis is the timestamp value in seconds and the $y$-axis is the hardware value. The ...
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1answer
146 views

Methods for calculating signal quality metric

i'm sure this is a fairly large topic area, but I'm not quite sure where to start. I have a signal in which I can change several parameters, such as the frequency, gain, etc. The modulation is a ...
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3answers
83 views

Is there a way to protect your signal?

I'm looking for a way to shield or protect produced signal or wave. In mechanics suppose you run the wave in tunnel. Is there a way to do it in transmitting the signals or waves created by mobile ...
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1answer
1k views

Detecting FSK near real time with c#

I try to detect some FSK signals made by audio in near real time. I know that I will get some latency. In the start I try to detect some tones of 10Khz in a duration of 75ms. That is achieved by a ...
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1answer
829 views

What's the Intuitive Description of Circular Symmetric Complex Zero Mean White Gaussian Noise?

Suppose we have an added discrete noise signal defined as: $$y[n]=x[n]+w[n], $$ where $w$ is zero mean white Gaussian noise. Question: When we say white noise, is it sufficient to say that it is ...
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2answers
206 views

“Perfect waveform” for cross-correlations?

I am well versed in cross-correlations, as my masters thesis heavily relied on them for music classification and beat detection. So this question focuses more on the signals that I am running an ...
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1answer
522 views

how to detect signal noise

I have data from a power transformer that has a frequency of 60 hz. Sometimes there are faults in the system and causes a large spike in the reading of the transformer. What I want to do is run the ...
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1answer
1k views

Envelope follower not smooth enough

With the following code, I get the "envelope" of a sound signal. However in the "envelope" there are small oscillations (high frequency) : it is not smooth enough... I imagine that it's possible to ...
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1answer
38 views

Non Coherent BPSK with no Channel State Information at the receiver

Where or what is the proof for the failure of BPSK in fading channel when we have no knowledge of the fading coefficient $h$ at the receiver in the equation $y=hx+w$, where $x$ is BPSK symbol equally ...
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1answer
30 views

What can be a limit to the maximum possible power of a pilot signal

In practice, what can be a limit to the maximum power of a pilot signal in wireless communication?
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2answers
58 views

What is the best to confirm that the output of a matched filter for a linear FM chirp is correct?

I have written a matched filter in matlab to compress a linear FM chirp signal and would like to confirm that the results of my range compression. My question is what is the best way to do this? I ...
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1answer
42 views

How can I objectively measure train noise from a sound recording?

I have made an audio clip of some local train noise, and run it through a spectral analyser: https://youtu.be/ily4VEoEuSc Here's a screen-capture if you can't view that: As I watch the graph while ...
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1answer
34 views

packet encoder RF packets by using LPF for determining if it's zero or one [closed]

I'm transmitting RF packets with frequency 868MHZ , symbol rate (it's the same as bit rate) is 50KBaud , and Im sampling them by a dongle (fs=20480KHZ) to capture those RF packets, the captured ...
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1answer
46 views

Deciding if the received packet is valid or not valid [closed]

I have sampled RF wireless packets as IQ samples file, those RF packets has patterns like preamable|syncword|data|crc , I'm doing cross correlation with my constant syncword (after I did the ...
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1answer
39 views

How can I create a jamming signal for desired frequency?

I am working on GPS interferences and countermeasures. I came across jamming in GPS receivers. So I have a input signal with frequency of 1200 MHz How can I create a jamming signal that can mask ...

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