Questions tagged [signal-processing]
the analysis, interpretation and manipulation of signals
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Can we catch signals from a cellphone using an external device? [closed]
What if someone stole em waves from our mobile devices to listen to our conversations or get our OTP. Whatever encryptions they have they are just EM waves innit and they cannot be propagated only in ...
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How do I generate a trigger signal from a periodic analog signal having varying amplitude [closed]
I have an analog signal detecting a periodic vibration of low frequency (<100Hz) and want to generate a pulse whenever the signal crosses a certain threshold. The challenge is that the amplitude of ...
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How do data acquisition systems work?
This is a theoretical question.
All the signal processing electronic systems I have developed up to now have customized electronics to filter out unwanted noise.
Because their electronic filters are ...
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SNR calculation
I want to calculate the SNR of the following signal (the blue signal):
The signal peak value is: 0.0292 V
The noise peak value is: 0.0012 V
Based on the following formula:
SNR=20 log(Vp-Signal/Vp-...
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Attenuating a signal from a eddy current sensor for an ADC
I have a eddy current sensor, in a 7200 Proximity Transducer System, with a voltage output of -18V to -24V. My ADC has a max input range of +10V. I need a way to step the output signal down so I can ...
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IR pulse sensor : signal stops after a few pulses
I'm trying to make a pulse sensor based on this tutorial: https://makezine.com/projects/ir-pulse-sensor/.
I therefore reproduced this diagram by replacing the LM354s with MCP6002s and without ...
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THD of two passive circuits
I am simulating the total harmonic distortion of two simple passive circuits.
VIP_Test = Ideal Sine Wave.
Goal is to find THD for Test1 and OP_VIN_Test.
(THD is calculated with the thd function in ...
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DFT of a pure sine wave not showing ideal sine wave
I have a question with regard to the DFT of an ideal sine wave.
This is my simulation result in cadence.
I analyzed an ideal sine wave (from vsin source) and passed it through a dft calculator ...
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Is this the correct way to make a bandpass filter?
I'm trying to make a bandpass filter for a low voltage noisy electrical signal coming from a K-Type thermocouple
To identify the frequencies I would need to filter out, I make a spectrum diagram using ...
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Switching from time domain to frequency domain and vice versa in signal processing using FFT
I have a problem dealing with a real signal in time domain or in frequency domain when I need to do some processing on it in the dual or other domain via FFT or IFFT.
I find myself dealing with a ...
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Anti-aliasing filter for 3.3 V ADC at 1 MHz
I am designing an anti-aliasing LPF for a 16-channel ADC on a custom STM32F415-based board. This design will ultimately be put on a car and used as a DAQ.
I am planning on running the ADC with a 30 ...
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Unusual answer for signals & systems problem [closed]
I'm stuck at part d) of the problem.
While my solution for the output signal after simplified is: \$y[n] = u[n] + u[n-2]\$, the provided answer: \$y[n] = 2u[n] - \delta[n] - \delta[n - 1]\$ with \$\...
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Ethernet port as a signal generator
I was wondering if it's possible to turn a PC into a signal generator through the ethernet port (or at least an amplitude-modulated sine generator). I specifically care about the ethernet port since ...
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Fourier series complex to real
I have to find the Fourier series of this function in complex form and transfer it to real:
\$f:(-\pi;\pi]\to \mathbb{R},\;\;\;f(x)= \begin{cases} x & -\frac{\pi}{2} \leq x \leq \frac{\pi}{2} \\ 0 ...
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Do faster responding low-pass filters exist compared to a traditional RC filter?
Lets say you have a very short DC pulse that has some sinusoidal noise in it. But the duration of the pulse is very short...maybe 0.5 µs. For an RC lowpass filter to respond quickly enough to begin ...
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