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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1answer
58 views

Determining zeros and poles from an equation

I'm given an equation \$y(n) = a_0 {x(n)} + a_1 {x(n-1)} + a_2{x(n-2)}\$ which is used to design a simple filter to remove a narrowband disturbance with frequency \$F_0\$ = 70 Hz. I'm told to let the ...
2
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1answer
34 views

Questions on this high frequency sawtooth generator

So I found this very basic sawtooth generator: http://www.radiolocman.com/shem/schematics.html?di=143990 I have a few questions about it: I understand that when the capacitor C_T charges fully to ...
0
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1answer
32 views

Using an unconnected audio splitter degrades audio signal quality?

Consider that you have one of the following: These are used to connect 2 male audio connectors into only one female connection. Since I can't find, for now, where I have the audio cable extension, ...
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0answers
11 views

signal variable problem vhdl

I am writing a vhdl code where i have seen some strange behaviour of variable and signal assignments. There is a factor 'a'. If 'a' is declared as a variable, then everything goes fine. But the moment ...
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0answers
61 views

Which information can be obtained from the phase spectrum about the signal? [on hold]

For any given signal using Fourier transform, we can compute it's magnitude and phase spectrum. In that I want to give focus on phase spectrum. Here, I want to know which information can be ...
3
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2answers
302 views

Obtain an accurate DC value in an AC+DC signal

Background: My goal is to use an Arduino with two proximity probe sensors to achieve some output. It is worth mentioning that the output of the proximity probe has two components: DC output that ...
0
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2answers
48 views

What makes an arbitrary waveform generator arbitrary?

Why are some signal or waveform generators called "Arbitrary Waveform Generators"? Am I misunderstanding the word arbitrary? This question is not necessarily about the word arbitrary but more about ...
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0answers
38 views

Can this be solved with an amplifier? [closed]

First of all, sorry for my English, if you find any difficulty understanding. This is a practical question regarding my ISP and cable installations through my house. So, this morning, I woke up ...
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0answers
35 views

Finding energy of asignal

I have the question shown below. Using that formula, I found that the energy of the signal is infinite. Is it true? and How can I verify the Parseval's theorem?
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3answers
75 views

Measure human voice for ambient noise level

I need to develop an ambient noise level to measure the loduness in an office. Sometimes during the day people raise their voice more than they should and a lot of confusion is created. So this device ...
0
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1answer
52 views

Convert DC 0 to +1V signal to -1 to +1 signal

I need to convert a 0V to 1V measurement signal to -1 to +1 volt. What is the best way of achieving this? I've tried searching but can't seem to find anything relevant, as I'm not entirely sure what ...
2
votes
1answer
57 views

Sonar single transducer element SNR vs array SNR

Background: I'm taking a flexible learning unit on radar and sonar systems in a vocational college for an assoc. degree level course. The teacher has given us a reading assignment: "Chapter 15 ...
0
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1answer
63 views

Noise on TL074 / TL084 but not on LM324

I made a circuit that modifies a signal so it can be safely read by an ADC. I'm using an op amp to shift the signal +2.5V so I can measure AC. When I do this shift another signal appears. About 40mV ...
3
votes
1answer
64 views

Another motorcycle project: gear selection indicator [closed]

I have another little project that I have been thinking of making, but am having some trouble with the circuit design. In a nutshell, here is what I am envisioning: Objective: Create an electronic ...
0
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1answer
30 views

Help for VR sensor signal conditioning (variable reluctance signal conditioning)

im trying create a CDI/TCI unit for my Suzuki Bandit GSF400. i need some help for VR sensor signal conditioning section. this is the disc that generate the pulse signal. i have found this image ...
2
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2answers
61 views

Calculating Power of a Non-Continuous Signal

I have to find the power of the following signal and would like to know if I'm doing this right or, if I'm doing it wrong, how to do it. The equation for power in my textbook is \$\overline{m^2(t)} = ...
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2answers
44 views

Sending identification signal with IR or RF

Is there any way to build a device capable of sending an ID signal with IR or RF? For example, imagine I want my TV to know whose remote is being used (assuming everyone has a different remote). I ...
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1answer
37 views

Control valve logic [closed]

I have a control valve which has an input control signal of 0..10V. Normally this means that at 0V the valve is completely closed and when the signal is 10V the valve is completely open. I found a ...
0
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0answers
34 views

Hack Quartz Clock Movement with Chronodot

I'm working on creating a clock design that will use an off the shelf Quartz Crystal Clock Movement. I know they are not all that accurate and was thinking of a way to make it more accurate. My ...
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0answers
34 views

Splitting Digital RGB Signal Line to multiple LED strips

I am trying to connect multiple strings of WS2812B RGB LEDs to the same signal line (so that they will all behave the same way, display the same colors, etc). The WS2812B is very time sensitive, so I ...
0
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0answers
19 views

Noise and raise in heat causes lose/no signal strength of my wireless internet USB

I'm 15-20Kms away from tower which is source of my signals. I have a Booster couple of months ago it was good enough to provide Strong Signals, As Summer comes the problem of raise in atmospheric ...
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votes
1answer
60 views

Which is the better way to send a broadcast signal to a great number of smarthphones in the same place? [closed]

I wonder which could be the better way to send a broadcast signal to a great number of smartphones in the same place at the same time? I'm thinking about 10.000 to 50.000 smartphones in an area of ...
8
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1answer
2k views

Why isn't the Fourier transform of a single sine wave cycle a single bar?

I have tried different Fourier transform codes out there on single sine waves, and all of them produce a distributed spectrum with a resonance at the signal frequency when they should theoretically ...
0
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1answer
19 views

Whether phase congruency and phase coherence terms are same or different?

I am studying the importance of phase in signal.Can anybody explain what is phase congruency ? Also,I am confused between terms i.e. phase congruency and phase coherence. Whether phase congruency and ...
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2answers
82 views

Why Doesn't This Op Amp Preamp Circuit Amplify?

I have the following circuit as part of a class D amplifier: simulate this circuit – Schematic created using CircuitLab I couldn't get the amplitude of Vsig to display, it is ~.447Vp, to ...
2
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3answers
480 views

How do signal reflections work?

How do reflections work, physically to the charge carriers level? Considering a square wave generator connected to a long, open cable, I've made a quick chronological diagram of the propagation of ...
0
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2answers
55 views

Reading a 1.2V-8.8V Signal into a 5V Arduino Input

An analog DC signal that ranges from 1.2V to 8.8V (from a thermocouple amplifier) is to be read from a input pin on the Arduino that reads 0V to 5V. Other that using a potential divider consisting of ...
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1answer
78 views

Trace vs Plane on Multi-Layer Board

Designing a 4-layer board (signal+pwr, gnd, signal+pwr, gnd), and I have some newbie doubts about the best option to connect different connector's pin or IC's pad to power lines, or sometimes to ...
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1answer
79 views

Test 220V 50 Hz signal using oscilloscope [duplicate]

Can I test a direct electric signal wave AC 220V 50 HZ using an oscilloscope in safe mode and the schema for this testing. The description in my oscilloscope say that the input AC pk and DC is Max ...
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3answers
66 views

Convert MP3 recording of data casette to serial data

I have a retro EMCO F1P CNC machine with a matching M1 controller that comes with mini data cassettes containing the "Machine State Data" which must be fed into registers of the controller before ...
0
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0answers
29 views

Reducing noise from an input using an FIR in VHDL

I have a non digital input I want to read in my VHDL file but it has sooo much noise that I would like to filter out using a digital filter that would sample the signal and allow pulse levels that ...
0
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0answers
24 views

Simulating noise in a digital signal

I'm trying to simulate a POTS line, and I have a reasonable set of digital filter coefficients sorted out. However, I'm a bit rusty on how I'd add a fixed amount of noise to match a given "SNR" of, ...
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1answer
91 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?
5
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4answers
738 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 ...
0
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0answers
16 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. ...
2
votes
3answers
122 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 – ...
0
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0answers
52 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
56 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 ...
0
votes
1answer
41 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 ...
5
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7answers
845 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
31 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
44 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 ...
1
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1answer
89 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
votes
3answers
190 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 ...
0
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0answers
6 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
121 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
43 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
69 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
113 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
112 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 ...