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Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

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1answer
26 views

TX leakage signal cancellation

How can I cancel leakage signal in short range pulsed radar with non-coherent processing and two antennas (TX & RX)?
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3answers
58 views

Tektronix function generator THD

I am confused by the datasheet of the AFG3021C: https://www.tek.com/link-click-count?nid=75006&url=https%3A//download.tek.com/datasheet/AFG3000C-Arbitrary-Function-Generator-Datasheet-75W282817....
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0answers
29 views

Ideas for electronics related c++ projects [closed]

I am engineering student ,I have learnt c++ to advance level covering OOPS, polymorphism, inheritance, template. I want to apply my knowledge learnt in my electronics engineering of various subjects ...
2
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0answers
43 views

Signal conditioning for piezo shock-sensor digital input

I have a piezo element glued to a piece of material, and I want to get a digital signal (to drive an interrupt on an Arduino) when something strikes the material. So, there's a certain noise floor on ...
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1answer
38 views

How do you reduce this simple system diagram for the sake of doing algebraic manipulation?

My guess is that since H(s) is parallel with 1(s) we'd do A(H - 1)? But this is my first ...
3
votes
2answers
158 views

Can I convert a mini guitar-amp into a portable auxiliary speaker?

Being a guitar player, my brother got me one of those guitar shirts for Christmas that has a board with pressure sensors attached to it and an actual miniature amplifier. When the sensors on the board ...
0
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0answers
28 views

trigger a circuit using one time signal

I'm really new to electronics and I need help. Say I have Line A. I need to control Line A to set it as HIGH or LOW using a one time signal through one input line X or maximum through two lines X and ...
1
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0answers
32 views

Finding the memory polynomial model coefficients

I want to build a memory polynomial model given that I know the corresponding output signals for known input signals. What is the easiest way to find the coefficients of it? And how do we take the ...
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0answers
34 views

How do I calculate a PID controller gain for a certain damping coefficient?

I have a third order process and I have to design a PID controller by cancelling out the two most dominant poles of the process. The process transfer function is: The controller is of the form, where ...
21
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14answers
1k views

How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other?

An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following: While linearity is a truly astonishing property of nature, it is by no means a rare one. ...
0
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1answer
44 views

Inverse Z-transform Problem [closed]

I'm rather stuck trying to compute the inverse Z-transform y[n] of the function below. I'm having trouble selecting the correct formulas from the table to achieve the right solution. Any help with ...
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0answers
11 views

Differential Power Analysis - Sizing LC Filter for High Power (100W) Applications, Expected effect on Variance

Working on a project where I am defending against side channel attacks on consumer motherboards, specifically power analysis. By monitoring the power consumption of a motherboard in real-time, an ...
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3answers
81 views

Linear Time Invariant System Causality [closed]

If I have an LTI system defined by the recursive difference equation: $$y[n] = -\sum_{k=1}^{N} a_k y[n-k] + \sum_{k=0}^{M} b_k x[n-k]$$, why can't I say the system is causal? The output at each ...
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0answers
44 views

How to discover the initialization being implemented

How to discover the initialization protocol being implemented The communication is between a device, which I'm not allowed to say( but I will call it DeviceX) and a car's key. I don't know wich ...
0
votes
1answer
29 views

Determine the impulse response of the following discrete system

I'm not sure how they got the answer (provided below) for the following discrete system y[n] = x[n]- 2x[n-2]+ x[n-3]- 3x[n-4] the answer is given as .... h[n] = [1 0 -2 1 -3] why is this? any help ...
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1answer
23 views

USBL Hydrophone Array Spacing

I am trying to design a USBL acoustic pinger location system for a school project. I am struggling to determine if the frequency of the acoustic beacon ping places a constraint on the distances ...
1
vote
1answer
29 views

Continuous, frequency-domain digital equalizer

I'm facing a real case of DSP application. I have a basic knowledge of digital filtering and telecommunication issues. The input of my "black-box" is a digital audio signal (say a common WAV file, ...
0
votes
2answers
45 views

What is the minimum output frequency according to this datasheet?

Can this DDS output down to 0.05Hz sine? I think the resolution is 0.0291 Hz. Does that mean that is also the miimum freq. it can synthesize?
2
votes
1answer
174 views

Calculating the entropy rate of ADCs

Formally, the entropy of a normal distribution is:- $$ \frac{1}{2} \log(2 \pi e \sigma^2) $$ So if you're sampling a random (normally distributed) signal, that would seem to be the rate of entropy ...
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votes
2answers
105 views

16 bit DAC microcontroller

I'm currently working on a audio project where I need to play a 16 bit depth signal with a speaker. Right now I'm using an atmega328 for prototyping, two 8 bit shift registers (controlled by the MCU) ...
0
votes
2answers
18 views

Define LTI system from a single input output pair

I am currently studying signals and systems, and am learning about LTI systems right now. I know any LTI system whose impulse response is known can be completely defined through the use of the ...
1
vote
2answers
50 views

What is signal resolution?

I'm trying to understand signal resolution, so therefore I am looking for a more clearer explanation. Primarily signal resolution is linked to an Analog-Digital converter. Quoting from new ...
0
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2answers
44 views

A question regarding signal analysis

I'm quite new to the topic but I know about LTI systems, convolution and Laplace transforms as a concept. I also know the meaning of transient and steady state analysis. I was reading an article on ...
0
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1answer
83 views

Can we use ethernet cable instead of coaxial cable without adaptors.?

I am a mechanical engineer. Trying to build a computer vision system using endoscopic camera. I have a camera with 4 pin input, 2 input pins for power supply of 5 volt and 2 input pins for video ...
1
vote
2answers
75 views

Creating a vibration device based on bass in audio [closed]

First, I'll admit that I haven't done any real electrical engineering in years so I'm quite rusty. But here's a fun project to contemplate: I'm building a device that "rumbles" with the bass in the ...
1
vote
2answers
82 views

Is there a circuit that can create dispersion?

I'm wondering if there's a circuit that would create dispersion effects. Essentially, I'd like to create a circuit which can do the following: Spread out a high frequency pulse. For example, put in a ...
2
votes
0answers
38 views

What is the signal-noise model of laser induced fluorescence?

The following image is an example of a fluorescence signal trace from the photomultiplier tube detector (PMT). Each spike represents one fluorescently labeled cell. This signal model is definitely ...
0
votes
4answers
121 views

TDMA in telephone circuit switching - isn't there delay in transmitting a particular user's speech? [closed]

Let's do a simple case on the left with X and A user telephones. So the way an analog signal (user's speech X) is handled, is that it is sampled at 8000 bits / sec. The high-speed C-channel has 128 ...
1
vote
2answers
93 views

Why are binary signals drawn continuous in time despite being a digital signal [closed]

The conventional definiton of a Digital signal is as follows: A digital signal is a signal that is discrete in time and quantized in amplitude. Almost all resources (textbooks, online sources,etc) ...
3
votes
1answer
189 views

Square wave autocorrelation integral

Given the following square wave signal g(t) : I'm trying to find the \$R(\tau)\$ of this signal, but I'm confused about how to solve the integral. In the signal above, the red square wave is the ...
1
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0answers
69 views

Dolby HX PRO implementation on existing tape recording deck

I'm experimenting the implementation of Dolby HX PRO's IC into an old stereo Fostex tape deck to improve high frequency and headroom capabilities. HX PRO works as a dynamic processor with the BIAS ...
1
vote
2answers
40 views

Pulse Train Sampling Rate

Assume I have a pulse train with frequency of F Hertz. A normal square wave has all odd harmonics. From Nyquist, if I want to "Reconstruct" the waveform, sampling frequency Fs should be at least 2*(...
2
votes
2answers
347 views

How does a car with keyless entry know where the key is?

If I hold the car key and touch the handle on the door, the car locks the doors. But if I leave the key inside the car, it won't lock itself. How does the car know where the key is located? What ...
1
vote
1answer
63 views

Find a sinusoid in a sensor data

I am collecting raw data from a radar sensor using source code from the manufacturing company to allow me to plot data. I am looking for a repetitive movement that would be considered sinusoidal. ...
0
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1answer
39 views

Are these two ways of doing equivalent?

I have two signals sampled at, say, 256 Hz. I want to make the difference between these two signals and downsample them, say until 32 Hz. Is it rigourously the same (in term of final result) to make ...
4
votes
2answers
412 views

PWM, PAM, PCM sine generation and usage confusion

I am confused about something fundamental regarding PWM, PAM and PCM. I am going to be using a speaker's driver analogy to explain my point. As far as I know motors use PWM for power input, I don't ...
2
votes
2answers
944 views

How can I determine the order of filter?

This is my first study about signal analysing. I'm very confused about filter order. My problem is how can I know whether its 4-th order, 12-th order, or 2nd order like the book says so? I'd like to ...
1
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0answers
33 views

How do single-phase inverters know if they're in sync with the grid after they're in parallel?

How can one inverter, once its output is already in parallel with the grid, measure the phase difference between the grid and itself? Any current or the variation in the current flowing on its output ...
0
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4answers
151 views

Phase Shift Keying: Is it ever actually used?

during my course in digital communications Phase Shift Keying is talked about where the modulation consisted of altering the phase of the carrier signal. This process takes up a lot of spectrum so I ...
1
vote
2answers
102 views

Amplifying signal with Darlington not working

I'm relatively new to electronics and this is not my usual field of work. For a bigger project I need to read a flow sensor's (Biotech FCH-C-PA-N) output. The output needs to be processed by an ...
0
votes
1answer
64 views

Mitigating unknown error in power analysis of ATMega328P microcontroller

Setup: Arduino Uno (ATMega328P Microcontroller) running inline assembly instructions using asm statements. Global interrupts disabled. Pin 13 (PORTB5), DDRB5 designated as output used for trigger ...
0
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0answers
22 views

Solution to coefficients for Spherical wave equations

Are there any methods for solving coefficients \$A\$ and \$B\$ for the Spherical wave equation below? \$p(r,\theta, \phi) = \sum\limits_{n=0}^{\infty} \sum\limits_{l=-n}^{n} \Big[A_{nl} h_{n}^{(1)}(...
2
votes
1answer
103 views

I don't understand convolution, and I would love to see some worked examples

I'm trying to get ahead on my classes for the school year and decided to start with Alan Oppenheim's Signals and Systems course. I'm already very stuck on how to convolve two signals. I have some ...
0
votes
0answers
42 views

Calculation of strain using fiber sensor

I'm going to use that fiber sensor for straing measurments https://www.smartfibres.com/products/smartfbg I would like to know the signal processing procedures. My approach is to do FFT with window ...
-1
votes
2answers
162 views

How does an electrical speaker determine amplitude and frequency? [closed]

So, I know that a DAC converts coded binary signals into analog signals, but what sort of thing determines the pitch and amplitude of the outgoing sound? Does the DAC use a clock for frequency and ...
0
votes
2answers
357 views

Edge detection circuit [duplicate]

I need to design an edge detection circuit to detect when a square wave signal goes from Low to High (rising edge) and when it goes from High to Low (falling edge). The circuit should preferably use ...
2
votes
2answers
109 views

Digital Audio Effects Design [closed]

I've recently graduated university with an MEng degree in Electrical and Electronic Engineering. As a third year project, I've used an ST-Microelectronics ARM Cortex-M4 based Nucleo microcontroller ...
1
vote
0answers
106 views

Help decoding line code

I have collected a burst signal from a radio device using an RTL-SDR and gnuradio and demodulated the FSK, but am having trouble deciphering what the line code is. Signal is at 151.3MHz Here is the ...
3
votes
0answers
69 views

Frequency locking for averaging resampling

Background I've done a long one-shot measurement of a periodic signal by an oscilloscope. Thus, I've captured around 250 periods of a signal. The signal itself is a pseudo-random binary sequence at ...
-3
votes
2answers
239 views

Edge detection circuit (for rotary encoder)

I managed to decode a rotary encoder using an arduino to read the input signal but I noticed other than the interrupts, the code is mainly made up of lines similar to: "IF this AND that OR that AND ...