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.

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65 views

What's the dwell signals?

Today When I was seeing this page(Digital multimeters (DMM or DVOM) part) I saw this part: What does "automotive timing"? and What's the dwell signals? are these electronic concepts?
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20 views

Which wavelet transform is best for the denoising of biomedical signals such as ECG? [on hold]

Which wavelet transform is best for the denoising of biomedical signals such as ECG? And provide the exact or approximate reason for choosing particular wavelet transform. Please also provide the web ...
5
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4answers
702 views

Audio signal trying to go back to zero zeroes

I created a two differrent signals on my android phone, one to act as the clock signal (lower signal), and the other to be the data signal (lower signal), but the problem is that the audio the signal ...
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0answers
12 views

PCM1865EVM as a bandpass filter

I recently started using the PCM1865EVM evaluation board from Texas Instruments.I am using it to process a signal. currently generated by a signal generator in future it will come from another device. ...
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3answers
102 views

Is there a Multiplex with X inputs to control X outputs?

I want to use a multiplex to controll my circuit. I just want something that can be a switch between an input and output. I thought to create this circuit: simulate this circuit – ...
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0answers
30 views

Frequency response and output signal

A causal and dynamic system has a frequency response given by the following curve The signal $$ 2 \sin(100t -30°)-\cos^2(200t+45°) $$ is applied in system input. Give the system output if a) ...
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0answers
38 views

Peak and leakage current detector

Hello I am trying to make peak and leakage detector for LCD shutter. I have specific parameters known : Voltage from 5V to 12V bipolar square wave. Testing is at 60hz Peak current ~30mA leakage ...
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1answer
53 views

Folding of a two signals

I have the following problem: according to my exercise text I have to calculate a signal in the frequency domain. I found out that I could use a the folding rule for time-discrete LTI systems and have ...
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1answer
34 views

shifting ac signal

I have an AC signal that is in the range of 1.5v-6.5v and it needs to pass through a buffer with a single supply of 6v to ground. So in this case, it needs to be shifted down by about 0.5v so that ...
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7answers
793 views

Is the meaning of a Decibel different when applied to Voltage vs Watts?

If I have an amplifier that provides +3dB, or an attenuator that provides -20dB, then how do I know if that applies to Voltage or power? In other words, if I have a 0dBV signal and I run it though a ...
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0answers
27 views

Waterfall diagram for car starting coil signal/interference

Does anyone have a waterfall diagram for the signal given off by an ignition coil when a car starts (or is operating)?
2
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1answer
38 views

HDD read head signal

I read that hard disk read heads use "giant magnetoresistance" so I assumed that I could measure a resistance change in the presence of a magnet. Unfortunately I failed. The read head came from a 3 ...
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1answer
72 views

Multiplexing analog signal

I want to read 4 analog signals (coming from 4 pH sensor, generally said 16HZ freq.) With one buffer op-amp circuit going into a single ADC channel. Is it possible to achieve this using analog MUX ...
3
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3answers
170 views

Where to put low-pass filter on the analog signal path?

I want to test my basic pH sensor circuit to find if there is a need for a low-pass filter. How I can test it? The signal pathway is: Sensor probe---> Buffer op-amp circuit ---> ADC ---> MCU So is ...
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0answers
5 views

How to add Marker (Event) to a bitstream file in Agielnt MXG Signal Generator?

Using an Agilent N5182B MXG Vector Signal Generator in the Dual ARB mode I am able to create, download and play a baseband waveform with the samples' marker #1 set, and sensed via the ...
1
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2answers
74 views

What is difference between Power-GND vs Pre-GND?

I would like to know the difference between different types of Grounds like Power-GND vs Pre-GND. Are all the grounds not same? Cant we connect the device to any one of these grounds? In my ...
0
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1answer
41 views

Enery and power when we have trigonometric functions (Fourier transform)

It is asked to evaluate the energy and power of the signal $$x(t)=10\cos(100t+30°)-5\sin(220t-50°)$$ Since it is periodic, I need to find $$\int _{-\infty}^\infty |x(t)|^2 dt \text{ and } ...
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1answer
65 views

can signal ground be carried in the connector shell?

I have a cable with 6 pins but I have 6 signals and I don't have space for the signal ground. If the shell is continuous from end to end, would it be fine to use that as the signal ground?
2
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1answer
69 views

Must this switch be turned on and off periodically?

Imagine that the AC1-2 is 170VAC at 150kHz~. I simply want to turn the MOSFETs on, and let the AC flow through a inductive-capacitive load. 1) If I can turn the MOSFETs on to saturation by ...
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1answer
91 views

Simple Power Line Communication

I'm working on a remote (wirless) door opener and I need to install a device (just in the opener) at the entrance of a building where there is an electric opener. The problem is i can not install ...
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1answer
38 views

noise signal passed thru Normal ( Gaussian Random variable) distribution system : exam problem?

I know that Fx(x)= F((x+a)/o) I don't know how to find Fx(x) that satisfy the p(y>=0) can someone clear this point to me ?!!
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1answer
39 views

signal generator - circularly polarised

I am testing some hardware in lab that computes the four Stokes parameters. To test the hardware, I want to generate circularly polarised sine wave. Provided the frequency is high enough (above ~100 ...
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2answers
82 views

Looking for a simple way to inject a signal on 60Hz Mains line

Okay, so I'd like to be able to inject a really simple signal on top of the 60Hz AC Mains. It doesn't have to contain any data per se, just a simple signal to trigger a receiver on the same ...
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2answers
65 views

Change AC signal frequency without changing the voltage

I have a non constant -/+1 Volts to -/+7 Volts AC audio signal. I want to design a device that takes this input signal, doubles the frequency, without changing the voltage. So, the output voltage is ...
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3answers
88 views

Calculating the power of a signal

I'm trying to calculate the power of a signal and my tutor has given me this formula to do it. I've spent the past while building a program and now the foundations are there it's time to implement the ...
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2answers
53 views

how to determine the probability the two signals are equivalent

I am new to electronic engineering and DSP. I have this orignal signal matrix [X1,Y1] . . . . [Xn,Yn] and then it goes through series of transformation. It can be rotation/shift_bit/or whatever ...
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1answer
78 views

Proof: A strictly bandlimited signal must also be a signal of infinite time duration [duplicate]

How can I show that a bandlimited signal is also of infinite time duration? I know it has to do with Fourier transforms and convolution but I'm not sure how to actually prove it. I also know that the ...
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1answer
50 views

Detect the maximum of signal

I am trying to create a bloc with Xilinx system generator to detect the maximum of a sine wave. I used the strategy that: $$ x(n-1)-x(n-2)>0$$ and $$ x(n)-x(n-1)<0 $$ but I didn't find the ...
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3answers
123 views

How safely to send signal between logic and higher current pcb?

I'm designing a PCB with 4 FETs. These are driven in the same board by totem pole drivers, and their load are about 5A total. I am using PWM at 1000Hz. The signal comes from a logic IC in another ...
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1answer
55 views

lower and upper 3dB frequency from frequency response in Matlab

Is there any Matlab code available to find the lower and upper 3db frequency of a plot. If not what could be the easy way. I am aware of the theory but implementing is becoming difficult.
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1answer
48 views

Just need to check if this equation correspond to this block diagram

$$y(n)=y(n-1)-ax(n-1)$$ Is this correct? Thanks in advance.
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3answers
58 views

Is a multiplexed signal same as a composite signal?

Used to StackOverflow, this is my first question here. So please bear with me if the question is too simple and obvious to you as I am not good in Electrical Engineering stuff. I really need to ...
2
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1answer
69 views

Create a differential output signal

I need to supply the galvo driver with a signal "Voltage Range ±3.0V p-p or ±10.0V p-p (Differential Input)" - that's what it says in the datasheet. I have a 0-5V single ended DAC and differential ...
0
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1answer
71 views

Using a envelope detector to demodulate low voltage signal

I am currently working on a project in which I have a modulated RF signal at a carrier frequency of 400kHz. The signal itself is fairly low voltage, and I need to extract it from the RF carrier. I was ...
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0answers
76 views

How do Dualshock 4 pressure sensitive buttons work?

I'm doing a reverse engineering research about the PlayStation 4 controller. I want to know how do the analog buttons work (the triggers in the bottom, not the analog sticks). I've found a nice ...
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2answers
69 views

Does a regular signal booster with antenna work for cell phone?

I am not that much familiar with communication and antennas. I want to build a gsm repeater (gsm signal booster), but I am not sure if it works if I do it like the way we do for a radio. What I am ...
0
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2answers
78 views

Send data to an Arduino by using an audio cable

I want to send some Data to my Arduino by using the audio jack of my smartphone/computer. (USB is no option, since my smartphone does not support USB Host mode and I also don't want to go wireless or ...
1
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1answer
71 views

Find autocorrelation function of a signal

Find auto-correlation function of a signal $$g(t)=e^{-2t}\cdot u(t)$$ where \$u(t)\$ is the unit step function. I don't know how to start to solve this problem. My book list this equation only: ...
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2answers
99 views

Acquiring an accurate clock input for my computer

Building a timegrapher is quite straightforward, it is nothing more than a piezo transducer connected through to an amplifier. However, in order to actually utilize the results, one need an accurate ...
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1answer
56 views

FM signal example

Sorry if this question is too basic, but I'm a software engineer student who must study communication systems. I try to represent a FM signal in a graphing calculator, but I don't know why the result ...
0
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1answer
40 views

Confusion with output wiring and signal conditioning

I’m little confused about wiring and signal conditioning the following instrument: http://www.skypowerinternational.com/uploads/documents/4.3351.x0.140-161_WG-Geber-firstclass-advanced_analog_eng.pdf ...
4
votes
2answers
108 views

Optocouplers for purposes other than galvanic isolation?

In the diagram below there are two modules, A and B, which are separated by a physical distance of about 15m. Module A has a 12V DC power input. Module A powers module B (they share a common ground). ...
1
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3answers
75 views

Subtracting Audio Signal from Ambient Noise Signal

So I'm pretty well-versed in the software world, and my buddy and I decided to tackle a hack idea to get into hardware hacking but we're trying to figure out whether our implementation will actually ...
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2answers
87 views

differential amplifier will cancel DC present at input

In differential amplifier, it is written that "only AC signal will be amplified and DC part at the input will be canceled and hence there is no need of DC blocking capacitor". I am not getting this ...
1
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1answer
90 views

How can I boost/limit a signal to TTL levels?

I am researching a data acquisition system to measure the amplitude and frequency of a 4,100Hz 5v-25v AC square wave signal. Actually this is version 2 for me, in the previous version I analyzed the ...
0
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1answer
89 views

Ultra low current pulse generator (for BLE module interrupt)

At the moment I'm working on a project with at BLE-module. This module is based on the CC2541 from TI. I want the BLE-module to permanently transmit a signal. This module has two modes: a level- and ...
0
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1answer
93 views

Adding two signals and finding the RMS and Peak to peak value of the output signal

I would like to start by saying I have been solving exercise related to Op amps and how to find RMS values and Peak to peak values. But I got stuck on this exercise. Basically, two signals has to be ...
0
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1answer
81 views

How does a cable tone-and-probe kit work?

A useful tool for someone installing electrical cabling of any sort can be a Tone and Probe Tool: it allows one to find individual leads among a possibly hundreds in a cable trunk, without having to ...
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1answer
66 views

Maximum signal data rate

I have a frequency signal range from 25 Khz to 35 Khz. I know that the the minimum signal sampling to assure reconstruction of the signal from the samples is 70 Khz. Would it be correct to assume ...
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2answers
53 views

Which characteristics of a Radio signal are involved to be selected by radio receiver? [duplicate]

the radio antennas receives millions of signals. how our radio selects the appropriate signal as it's input? which characteristics of the signal are involved for this selection.