Questions tagged [amplitude]
The amplitude tag has no usage guidance.
111
questions
0
votes
1answer
125 views
Obtaining the frequency and phase spectra from fourier transform?
For a question on my homework, I am given f(t) = e^(-a*abs(t)) and asked to find the Fourier transform of the function. I understand how to do that part, but then ...
1
vote
2answers
183 views
how to make fft ignore phase shift when only interested in magnitude
I have a signal that consists of a sine wave, on which I apply a rectangular window and then an FFT. I'm only interested in the magnitude of the sine wave, and I want it to stay the same even if the ...
1
vote
2answers
233 views
Estimating the amplitude of a particular frequency
I am relatively new to DSP and have been reading a lot on the internet. I have a couple of questions.
I have a signal in the form of a function
$$
f(x) = A_0 + A_1 \cos(\omega_1 x) + A_2 \cos(\...
2
votes
1answer
134 views
Perform lowpass filter by hand
I've done research and could not find any resources on this topic.
I have message signal composed of more sinusoids. Then I preform amplitude modulation, that is multiply that signal with higher ...
3
votes
1answer
966 views
Why do we read that Hilbert transform can be used for envelope detection?
We can often read that Hilbert transform is useful for envelope detection (e.g.
Hilbert transform to compute signal envelope?)
I have done some tests with various soundfiles, and
...
4
votes
1answer
906 views
Envelope of a signal via Convex hull / Edge detection
Is there a method in order to compute some sort of edge detection / convex hull of a signal x[n] (in orange here). Here of course the orange signal is not convex ...
0
votes
1answer
9k views
Power Relation in DSB-FC AM [closed]
So, in my class I have to learn how to derive the power relation in a Double Side Band, Full Carrier Amplitude Modulated Wave However, I have hit a wall somewhere. ...
3
votes
1answer
355 views
Estimation of the amplitude of a frequency component in a signal
I'm working on a device that produces a signal with sampling rate of 100 kHz. Every 40 ms, I receive 16000 points, from which I have to extract a frequency close to 3.55 kHz. I have developed a method ...
3
votes
3answers
2k views
Peak to peak amplitude of sum of sinusoidals (harmonic frequencies)
I would like to estimate the peak-to-peak amplitude of a periodic signal whose frequency components are known. This is, I have the frequency spectrum (a peak in the fundamental frequency and other ...
0
votes
1answer
69 views
Double sideband AM
In A3E transmission, I wonder how a single antenna is used to transmit a carrier wave, upper sideband and lower sideband altogether at the same time?
1
vote
4answers
837 views
Transfer function between voltage and decibel output for in-ear headphones
What would be a decent formula for approximating the connection between voltage and decibel output for a typical set of unpowered in-ear headphones?
I'm generating sine waves from the computer: an ...
