Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [signal]

A signal is a stream of information in the form of a varying quantity. Usually in electronics, signals can be in the form of voltages, currents, or radiated electromagnetic fields.

0
votes
0answers
9 views

Shielded twisted pair balanced transmission line implementation

I wanna sending a signal from board 1 to 2 through 20cm line. I have four channel in differential, First I add them, can I send them through shielded twisted pair like this: Is exactly I need a ...
0
votes
0answers
29 views

Determining required signal SNR (beat signal from FMCW RADAR)

I'm trying to determine the SNR required for signal outcoming from FMCW Radar. This is the chain: signal will created by "24 GHz VCO and PGA with 2-Channel PA Output" by triangle shape frequency ...
0
votes
0answers
25 views

Hilbert transformer - calculation the amplitude characteristic of the signal spectrum

The x[n] signal is given to the Hilbert transformer. Determine the amplitude characteristics of the spectrum at its output. So I have this problem, and I need to calculate the amplitude ...
0
votes
0answers
25 views

AC signal for impedance meter design

I am designing an impedance meter with NI current output device and voltage input device. I am applying a current signal, measuring the voltage response and dividing Vp-p of voltage and current to get ...
0
votes
1answer
59 views

Is it possible to generate user-defined signal using an android phone?

Is it possible to generate an electronic wave signal using an android phone? (Theorically) For example by customizing the firmware can I produce some signals like \$ f(t)=2 \sin 3.2×10^9t+3\cos 5×10^...
0
votes
3answers
61 views

Oscilloscope Run/Stop output signal

Hi, guys. Does anyone know what causes the multiple waves at a time when you run the oscilloscope? But when you stop (pause) the oscilloscope, you get one wave a time (picture on the answer column). ...
1
vote
1answer
34 views

Pole placement to create a full-state feedback controller?

I am learning about control theory by going through Oagata's Modern Control Engineering. As part of a practice exercise I am trying to design a full-state feedback controller that satisfies my ...
0
votes
1answer
48 views

Adding differential multiple signal

As I asked in "Adding multiple analog signal" before, I got that: for adding some signal together, we can only use op-amp, instead of lovely integrated circuit (ough). But the question arise because ...
0
votes
2answers
59 views

Adding multiple analog signal

I'm trying to add 4 output of ADA8282 together and create only one analog signal with bandwidth about 6 MHz, I know Op-Amp adder as "How can I add three AC signals?" and "ElectronicTutorial" said. ...
0
votes
2answers
56 views

Mathematical model for differential signals and relation with reality

i have a question and i hope is not that strange. i spend some time asking myself how people came out with the mathematical model for differential signals and why is this better in this way?! to be ...
0
votes
1answer
42 views

How to determine u(t+1) - u(t-1) as even, odd or neither?

x(t) = u(t+1) - u(t-1) is given. How do we determine if it is an even or odd signal or neither? Do we plot it out or do we use the condition and convert it. and also, is it even or odd?
1
vote
1answer
55 views

How can ground bounce be simulated by lumped elements?

I'm trying to demonstrate myself and to some friends how ground bouncing occurs. Is there a way to use lumped circuit with some compients to demsotare it? Something similar to simulating inductive ...
0
votes
0answers
49 views

Strange noise from speaker

I have speaker connected to raspberry pi through amplifier circuit. But I have this annoying noise coming form speaker. Could anybody help me? I have motors connected to same battery and one linear ...
0
votes
1answer
46 views

How phase modulation changes spectrum?

I'm studying amplitude,frequency and phase modulations for an exam. I just studied amplitude and frequency modulations, however i didn't succeed in understanding how the phase modulation changes the ...
0
votes
1answer
41 views

Frequency response of the waveguide

So, I have signal in the waveguide that is transmitted by two modes of radiation, for which the delay is for example \$\tau_1=6\,\text{ns},\, \tau_2=6.5\,\text{ns}\$, respectively. And the energy ...
0
votes
3answers
66 views

Switching a resistor ladder

Can anyone suggest how i could switch this resistor ladder with the smallest possible footprint. I was looking up analog switches but not sure if thats the right way to go. The circuit tells an ecu ...
1
vote
0answers
59 views

Reducing electromagnetic interference in underwater acoustics cables

Our college underwater robotics team has a passive acoustics system with four hydrophones that provide an analog signal typically between +/- 200 mV corresponding to the sound wave at that point in ...
-1
votes
1answer
93 views

Replicating 0-5k resistance signal

I am trying to essentially replace the accelerator pedal position sensor of an electric car. It's a 0-5k potentiometer type throttle. I have tried using digital potentiometers - MCP41010, 2 in ...
0
votes
0answers
23 views

Does orientation of SiPMs matter?

I'm designing an SiPM array using the SensL MicroFJ-60035 TSV. It's a BGA SiPM with its pads in a 6mm by 6mm square layout. Here's a link to the product description below as well as a document showing ...
1
vote
2answers
48 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 ...
1
vote
2answers
50 views

What is image and video signal ?

Signal is something that carries information. Usually, something is a pattern of variations of physical quantity that can be manipulated, stored, or transmitted by a physical processes. I am wondering ...
0
votes
0answers
19 views

using directional coupler to cancel common mode signal?

Reading this paper, and other ones by the same authors, I encountered the idea of rejecting the common mode signal (the large background) using a directional coupler. The second paper linked here ...
0
votes
0answers
64 views

FPGA/VHDL: Branching Input Signals

I was curious if it's possible, or if there is any harm, might be a better question, in branching an input signal within an FPGA design for multiple uses? What I was looking to do in my design is this:...
0
votes
1answer
49 views

Protect signal from noise in Arduino

I am trying to send a signal from the Arduino to a relay to open a switch. My problem is that my Arduino will be near the AC power lines. I searched for how to prevent the noise to ruin the signal ...
0
votes
1answer
62 views

Need help extracting line out signal from car radio

I'm trying to extract audio signal from my car stereo and use it as an input to my external amp. The place I want to get it from is marked in red in this picture: I used the IC31-34 pin12 to get the ...
2
votes
0answers
36 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 ...
1
vote
1answer
48 views

Spectral analysis of spectrum analyzer

Using measures from a spectral analyzer, I am a bit confused on how to properly compare the power of each spectral line with the fourier coefficients (Parseval). Take this signal: Take it's spectrum:...
1
vote
2answers
89 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) ...
0
votes
2answers
37 views

Isolate a digital signal that changes its amplitude

I have to isolate a digital signal that has the following characteristics: frequency: between 1 and 1000 Hz amplitude pk-pk: 12V offset: 0-6V With "offset" I mean the actual voltage may change from ...
1
vote
0answers
75 views

Rubidium standard mystery output?

I've been playing with a frequency counter (Racal 2202R) that has a built-in rubidium standard. It has two outputs, "Rb OUT 1" and "Rb OUT 2". I could not find any documentation at all, but the ...
1
vote
0answers
33 views

Question about time invariant systems

So, as per projectrhea Going x[n] -> System -> Delay results in what I would expect. However, going ...
0
votes
1answer
70 views

Wheel heading using PWM

I have a general question which im not sure how to implement. Suppose that a car is driving on a straight road and it starts doing some maneuver. Due to this maneuver the driver moves the wheel ...
0
votes
1answer
48 views

Understanding voltage drop in control cables

I recently worked on a project that involved a 300 feet cable run from one part of a building to another at our plant. Its a simple 120V circuit that originates in a control panel, travels 150 feet to ...
1
vote
2answers
64 views

What is the meaning of the difference between the Fourier transforms of a single pulse in these two cases?

In texts the Fourier transform of a single pulse is explained as below: They always create the pulse from -T to T, and they always show the sinc function symmetric around the origin. But in reality ...
0
votes
0answers
65 views

Confusion with Nyquist theorem when sampling cosines versus sines

I'm having different results when sampling a cosine wave versus sine wave at different scenarios. I used MATLAB to plot waveforms. I will try to give some examples to make clear where I'm stuck at. ...
0
votes
1answer
54 views

Single tone signal generation at microwave frequency with best phase noise and spurious performance

What is the best way to generate a single tone signal with best phase noise and spurious performance? Is frequency multiplication the best way? single stage multiplication or multi stage ...
0
votes
2answers
46 views

Confusion between analog & digital signal and modem

Telephone wire is a lowpass chaneel so the process looks like below. (Maybe right?) Voice(analog signal) → Sampling(digial data) → Coding(digial signal) → transmit There's no need to convert digital ...
0
votes
2answers
43 views

Signals and Systems - Taking Integral of Unit Step Function

I am a taking signals and systems course and my professor posted the solutions to our latest homework and I am trying to understand one of the steps. Below is the solution. Bracketed in red is what I ...
1
vote
1answer
61 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. ...
1
vote
3answers
151 views

Methods for confirming on both sides that a signal was received in one direction

Say there are two devices (A & B) that talk to each other (full duplex). For the sake of this example, let's say the medium is RF (wireless). If device A sends a message to device B, what ...
0
votes
1answer
56 views

Pseudobipolar signal example - Analog Devices AD7682

What is a pseudobipolar signal? I read this word in the datasheet below: http://www.analog.com/media/en/technical-documentation/data-sheets/AD7682_7689.pdf Can you show me an example with a plot ...
0
votes
1answer
50 views

Would a bridge rectifier allow to detect µs-scale pulses of either polarity

The incoming signal is ground-referenced and consists of short (a few µs each) pulses at >150V. The signal is at ground potential the rest of the time (the "duty cycle" is low), and is of low ...
0
votes
2answers
81 views

Proper convention for schematic component pin input/output arrows

In a schematic, if a designer chooses to use arrows on pins of a component, should they always point in the direction of current, or in the "perceived direction" of the signal? Or this a made-up ...
0
votes
2answers
58 views

Do I need to consider RF power splitters for signal <1kHz?

I need to tap a signal on a BNC cord to record it with a Labjack ADC. The signal is very low frequency, as the FFT shows. I was planning on using an RF power splitter to add a line to the Labjack. ...
0
votes
1answer
38 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 ...
0
votes
2answers
72 views

Does a splitter still reduce signal if only 1 of its ports is used?

I'm using a Wilson Electronics signal amplification system to try to get phone signal in my house. I'm going to attempt using a coaxial splitter like this one to split the amplified signal to multiple ...
0
votes
1answer
33 views

Higher Voltage = Improved Signal Strength

I'm using a reed switch to detect the state of my garage door. It's connected to an ESP8266 via twisted cables of 1.5m and each line has a pull-up as the signal floats too much otherwise. Well it ...
3
votes
2answers
396 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 ...
5
votes
1answer
130 views

RS485 minimum node spacing - 3 x RS485 device on PCB

I would like to ask something about RS485 minimum node spacing which is described in (Page 5) TI Design guide I would like to create device which consists from 3 existing RS485 devices. My plan was ...
2
votes
2answers
666 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 ...