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Signal Processing

Questions tagged [envelope]

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60 questions
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Question: Is it possible to demodulate perfectly an AM envelope from AM-FM signals? I have found 2 contradicting explanations Answer 1 - NO: Following this thread: Why Hilbert Transform is terrible ...
Processor48's user avatar
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I measured the following signal: Also, I measured the noise of the oscilloscope and the two electrodes, I used to the measurements: Oscilloscope noise: Measurement electrode noise: The output ...
Slania87's user avatar
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I have a group of data as following, how could I get the envelope of such data? By envelope, I mean a smooth curve that contains majority of the data.
Linfeng Mu's user avatar
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This question originates from the interest of minimizing settling time for a broad band oscillator. Instead of using a broad band low-Q resonator with a long settling time, like the dashed line in ...
David Jonsson's user avatar
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1 answer
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Assume the normalized frequency of the sinusoid signal is 0.48, and the sampling frequency is 1, so, the nyquist sampling theorem is well met, there is no aliasing, but why does there seem to be a low ...
user71925's user avatar
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1 answer
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I'm trying to compute the power per minute in the time domain of some seismic signals. I deal with signals sampled at 5 kHz characterized by random amplitude peaks emerging from low background noise ...
Marco Piantini's user avatar
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I have a sine wave signal with a frequency of 1 Hz, and it is evident that there is low-frequency modulation. I want to compensate for it by extracting the envelope using the Hilbert transform. ...
lilili's user avatar
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1 vote
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i have a 192kHz sampled signal that has been measured using an ultrasound MEMS microphone and i want to visualize the spectral envelope. I have found here and here ideas on how to do it (mainly "...
Tom's user avatar
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76 views

I have an interferogram of a white LED. I am trying to extract the envelope of the signal. Shown is the interferogram, and the absolute value of the Hilbert Transform of the interferogram. I used <...
Matthew H's user avatar
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1 vote
0 answers
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Assume $s(t)$ is analytic, such that it has no negative frequency components. Will $s(f(z))$ also be analytic, assuming $2≥f'(z)≥1$? Concretely, I work with audio data that is mapped through a time-...
Sebastian Præsius's user avatar
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6 votes
3 answers
1k views

The Analytic representation of a signal has no negative frequencies. Does this mean that everywhere, it's instantaneous frequency is positive?
Sebastian Præsius's user avatar
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6 votes
4 answers
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I have a signal that looks like this: Red line is the function I'd like to obtain somehow. Everything <= -60 is basically absent data (i.e. not low signal). If I understand correctly, Hilbert ...
tkroman's user avatar
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1 answer
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I have the following wave: I know that it is demodulated by an envelope detector whose source resistance is 0Ohm and its load resistance is 250Ohm. Now, I need to calculate a C capacitor in order ...
neil_huygens's user avatar
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I have a waveform that's modulated by a trapezoidal function. I fitted the envelope to the expected function to show if the amplitude is modulated correctly. I also plotted the difference of the fit ...
Typhaon's user avatar
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-1 votes
1 answer
107 views

I am trying to recreate the envelope function from matlab in python, but I have a problem with the initial values. I have a window of 1000 and the first 1000 values won't show up. Here is a snippet of ...
Manuel's user avatar
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