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42 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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1answer
29 views

Maximum Likelihood for colored noise

I have the following question about the maximum likelihood (ML) in presence of inter-symbol interference and colored noise. Assume the communication system is as follows. Information source, ...
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0answers
29 views

Maximum Likelihood question

I have a basic question about maximum likelihood (ML) estimator and its implementation. I am trying to simulate a communication system affected by ISI and noise, while using ML at the receiver side ...
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2answers
34 views

How to interpret output of matched filter with complex input?

I have implemented a matched filter based on the Fourier Transform approach. In the real numbers domain that means that I use as the coefficients of my filter (B) the inverted time-samples of the ...
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1answer
40 views

detection of similar segments of two signal

I have two signals, the first is a reference signal from which I selected a segment. I'm trying to find which segment of the other signal is the most similar to this selected segment. I'd be glad ...
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1answer
32 views

Why Fourier transform and Stockwell-transform retain the absolute phase information of one signal?

Hello friends am studying the topic of signal processing and the Fourier transform and the s-transform and in most books as for example "Time-Frequency Signal Analysis and Processing. 2nd" of Boashash ...
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0answers
12 views

MUSIC algorithm with incoherent sources

From what I gather, the MUSIC algorithm, when used for direction of arrival estimates, requires a narrowband signal so that the wavefront impinging on the receiver array differs essentially only in ...
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2answers
45 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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1answer
64 views

Decoding of binary signal from a temperature sensor [closed]

I have the following signal from a temperature sensor (broadcasts on 433.92 MHz, apparently as ASK). I cannot for the life of me extract the temperature data. I've tried reading off the bits in so ...
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0answers
94 views

Detection of sine signals with random amplitudes

Problem statement: I am designing a NP detector for the following detection problem: $\mathcal H_{0}: x[n] = A_0\cos(2\pi f_0n) + w[n]$ $\mathcal H_{1}: x[n] = A_1\cos(2\pi f_0n) + w[n]$ where: ...
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0answers
32 views

How to detect a signal pattern distorted with noise?

Signal transmitter will send the series of single notches with predefined spaces between them (all spaces can be different). This packet is a single bit of information. I assume that on the receiving ...
2
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1answer
58 views

Fourier transform of Image to identify sinusoidal sources of interference

I'm a statistics grad student, and I just started getting into Digital-Image-Processing (an analogy for processing super-large contingency tables). In the book "Digital Image Processing" by Gonzalez ...
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2answers
62 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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2answers
202 views

how to generate a smooth sine wave with time varying frequency in matlab

I'm currently designing a knock sensor for my FSAE team's car and I'd like to be able to test various software strategies with a fairly realistic signal (at least more realistic than a couple sine ...
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1answer
45 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 ...
1
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1answer
54 views

reducing MIPS in detecting tones

Currently our software is detecting tones using FFT and checking if there is only a single peak in frequency spectrum. Our software needs to know what kind of input it is before taking action. So we ...
1
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1answer
93 views

Exact definition of soft bits in digital receiver

At which stage of digital receiver, the bits are considered as soft bits? I am unable to find the exact definition. I have rough idea how soft bits are different from hard bits but in terms of signal ...
5
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4answers
449 views

The difference between convolution and cross-correlation from a signal-analysis point of view

I am trying to understand the difference between convolution to cross-correlation. I have read an understood This answer. I also understand thepicture below. But, in terms of signal processing, (a ...
5
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2answers
124 views

Fast pitch recognition

I need to detect pitch (measure signal frequency) while the musicians play music, giving a warning if they are out of tune, but music happens to be a bit too fast for FFT (Fast Fourier Transform). ...
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0answers
33 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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2answers
226 views

Finding a signal inside a time series using matlab xcorr()

I would like to find the exact replica of signal A in time series B. I am working with the simple toy example below, in which A is located starting at the 4th position in B. I thought that using ...
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1answer
73 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
146 views

Peak detection techniques

I'm using a cell-averaging constant false-alarm rate (CA-CFAR) detector to detect peaks like the first one in the following plot: The magenta line is the adaptive threshold, which is the local ...
2
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0answers
35 views

Supervised instrument recognition

Is it possible to use NMF for a sort of supervised polyphonic instrument recognition? I have training data for a timpani and training data for a bongo (or a bongo, snare and box drum). How can I ...
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3answers
126 views

How we decide sample rate and number of samples while doing dsicrete Fourier transform

I solved a differential equation numerically and I want to find the frequencies present in the solution but I am not able to figure out sample rate/frequency and no. of samples that I should take.can ...
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1answer
126 views

Harmonics of 50 Hz

I have a signal which clearly shows harmonics of 25 Hz (or 50 Hz?), this is actually my question. I do not think the 50Hz resonance comes from the power supply leakage, since my power supplies works ...
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3answers
133 views

Algorithm for detecting the time where the signal is above a threshold

I need to detect the time window where a 1D-signal is above a certain threshold. If it dips below the threshold briefly I'd like to merge the two windows, if it dips below for a longer time, split ...
4
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3answers
116 views

What are the differences between notch filter & Goertzel?

I would like to integrate in my application a tone detector but I'm confused between 2 kinds of filters: Goertzel or Notch? I saw that Goertzel is a recommended for tone detection. But - what if I ...
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0answers
18 views

Zero Cross Rating synchronization

I send some pure sinuses that are representing bits. I found that after some bits the system is losing synchromization so for example: if I want to catch a 13Khz sinus I get 12.8K. I use ZCR to ...
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0answers
59 views

Binary FSK optimal detection rule

Let us consider BFSK modulation with symbols $\in {{1,2}}$. For symbol m the transmitter sends $s_m(t)=\sqrt{P\over T} e^{j2\pi f_mt}$ where $m=1,2$ and $f_m$ is symbol's $m$ carrier frequency. The ...
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0answers
34 views

BFSK software demodulation with zero crossing rate - sync problems

I try to decode my bits which are seperated by 100 Hz: '0'=13KHz, '1'=13.1KHz. Now, I'm just trying to send 8 bits in a 15msec ...
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2answers
240 views

What are the alternatives to FFT for computing high-resolution tone power levels?

I have a system where there's a transceiver which transmits tones on specific frequencies (about 260kHz) and a receiver which is supposed to recognize those tones. The transmitted tones are of low ...
0
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1answer
175 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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0answers
120 views

Signal reconstruction in FMCW radar

I am doing fmcw radar simulation. I have an output of mixer and from that I want to reconstruct the amplitude and phase of the signal. Therefore, I am taking hilbert transform and by the ...
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0answers
61 views

Identify correlated colored noises that affect a signal

In the process of signal + noise, which is not stationary. In this case how could I a. determine what autocorrelated noise colors affect a signal. b. What mix of correlated colors affect the signal ...
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0answers
23 views

Criteria to distinguish good/bad response to Intermodulation

I am actually studying the effect of intermodulation on multiple devices which are basically building element that contain amplifiers FPGAs and ADCs. I know for a fact which unit is bad and which is ...
0
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1answer
72 views

What is the right algorithm to detect segmentations of a line chart?

To be concrete, given 2D numerical data as is shown as line plots below. There are peaks on a background average movement (with small vibrations). We want to find the values of pairs (x1, x2) if those ...
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2answers
52 views

Any basic paper on biomedical signal processing to practise with?

I am quite interested in biomedical signal processing and I am looking for some biomedical signal processing papers in order to reproduce the results that they obtained. The idea is to redo what they ...
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2answers
81 views

This is about signal processing in the first radar

I read in a book that the first radar was a CW one that was used to detect ships. Since it was CW, did it use Doppler to detect the moving ships? What was the signal processing used in it? Is there ...
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1answer
269 views

Synchronizing data sent over sound beeps with Goertzel Detection, C#

I'm trying to send some text over sound. For example, I try to send the words "Hello John". I do it this way: Every char is converted into its binary ascii code. Then I construct a wav file with no ...
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1answer
44 views

Ways to identify if music has vocal timbres in it?

The human voice is singular because it has a specific frequency spectrum and fast transitions between vowels and consonants. What are good and computationally fast ways to detect if there is probably ...
1
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1answer
68 views

Far field spherical waves plane waves

All em radiation propagates spherically and at a far off place a small enough distance, when observed appears like a plane like our experience on the earth. So I tend to think that whether a wave on ...
3
votes
1answer
500 views

Detect dog barks

I’d like to use my Raspberry Pi to record when and how often my dog barks. But for privacy reasons, I don’t simply want to record the loudness in the room, so I have to automatically detect barks. ...
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2answers
519 views

adding noise to a signal

I have an audio file. I took an extract of the file called variable "CALL", and I took another extract from the file which is just filled with background noise, called "BACKGROUND". Using matlab, I ...
0
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1answer
70 views

Matlab: if given nothing but an audio file, how do I modify it to produce incrementally lower signal to noise ratios?

I have an audio file with a high sampling rate of 250khz. It contains animal noises. I've built a program which counts all the animal noises. However, I want to find out how robust the program is and ...
3
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2answers
203 views

Create Matched Filter Reference Signal when Scaling Unknown

I am working on a problem which raised what should be a simple question, but I'm stuck on it. The objective is to detect a shifted and scaled version of a known signal in the presence of Additive ...
2
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0answers
31 views

Signal conjugation detected on RF recording samples, why?

I collected spread spectrum signals at 400 MHz at low elevation angles using Software Defined Radio complex sampling over the seasons. I noticed that over watery, icy surfaces, the RF samples are ...
0
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0answers
31 views

Finding periodicity within sequence of time hacks

I have a series of time hacks for various events that have occurred. Some of these events occur at regular intervals (+/- some small variance) but I do not know what those intervals are and would ...
3
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1answer
275 views

What is the theoretical upperbound of information that could be transmitted by a device per second?

Suppose I would like to stream data from a device in a single second. What would be the theoretical upperbound of the amount of information (in bits, bytes, pixels...) that could be sent during this ...
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1answer
414 views

Feature extraction for sound recognition and classification

I am building an application that would "listen" to the microphone input, analyse it, and compare the analysis to a pre-analysed and pre-classified sound bank (small - maximum 20 sounds). It will then ...