Questions tagged [signal]
The signal tag has no usage guidance.
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How to get the difference equation from second-order digital filter block diagram?
[![enter image description here][1]][1]
Here I have a diagram and I am trying to create a difference equation for the filter.
I've been using practice examples to try figure this one out however I am ...
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Finding a signal output $y(n)$ with input signal $x(n)$ and impulse response $h(n)$ with a DTFT
I am studying for my Digital Signal Processing course and I am stucking on the following exercise:
Given an $\text{LTI}$-system with input signal $$x(n)=\frac{1}{4^n}u(n)$$
and impulse response $$h(n)...
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How to send a TTL trigger signal remotely
Sorry if this is a dumb question, but I am an undergrad intern working on a semi-independent project in a lab, and no one here can really help me with this.
I am trying to control a lab instrument ...
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When working with generic electrically shielded signal cable, can I treat the unshielded strands of wire as signal reference ground?
I am working on a CNC application where one controller board will be sending signals to another board. The environment may have electromagnetic interference (EMI) from nearby motor activity, so these ...
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How significant is signal noise from a BNC connector?
I'm trying to build a double cross antenna that can be folded/taken apart based on the design of the picture and receive signals from weather satellites. The idea is to make each of the four dipoles ...
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Active noise cancelling headphones - How fast does a digital signal processor have to be to perfectly cancel out noise with an inverted signal?
How fast does a digital signal processor have to be to perfectly cancel out noise with an inverted signal? Is it possible for a digital signal processor react so fast?
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How to add a Gaussian noise signal with zero-mean in a given data set?
I have a real-time velocity measurement data set in a excel (.xlsx) file. I want to add the Gaussian noise signal with zero mean in this real-time data to create three set of pseudo measurements. ...
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Is it possible that room noises could end up on the recording when recording audio from an analogue source?
I have a VCR with a tape cartridge playing in it. The video output (SCART/RCA) goes from the back of the VCR into my Elgato video capturing device's RCA cables. The Elgato device is then connected via ...
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How can I find the Transfer Function in Z-domain?
This is my signal;
$y[n]=x[n]+0.8x[n-0.2]$
When I take Z-transform I get;
$Y[z]=X[z]+0.8z^\frac{-1}{5}X[z])$
Then I found the Transfer function as;
$H[z]=\frac{Y[z]}{X[z]}$
$H[z]=1+0.8z^\frac{-1}{5}$
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Are there offsets in these accelerometers signals?
How you can see in the picture below, there are 3 signals from 3 piezo accelerometers placed on a oscillating 3D structure. The structure should vibrate only along the z axis (blue track), but there ...
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Quickly stopping a phone from attaching to a network
I struggled for a while to find which group I might ask this question in. Figured engineering minds would be the best.
Some time ago I discovered a good friend was in an abusive relationship. This ...
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Can cross correlation be used to see if filtering of a signal has changed it too much?
I am filtering a signal, and want to check if I am not over filtering it , I wanted to use cross correlation , but I am not sure if it is a good technique. usually I get something like the following ...
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Small wireless proximity device to alert me when my cat gets into my WiFi range
I have the following situation. My cat goes outside every day, the problem is I have no way of telling when he is back around the house unless I go outside myself.
I need some small wireless device I ...
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Meaning of SNR in Instrument Specifications
I am evaluating the specifications of an FTIR instrument (Bruker Vertex) and came across the following statements/items:
Signal-to-Noise 5 sec sample, 5 sec reference: >10,000:1 (<4.34 x 10-5
...
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How does free space path loss change with receiver's antenna's height
I have a question which seems like an easy one, but I couldn't find anything on Internet to be 100% sure.
The free space path loss equation is:
$$FSPL=20\text{log}(d)+20\text{log}(f)+20\text{log}(\...
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