All Questions
Tagged with signal-processing acoustics
59
questions
3
votes
2
answers
73
views
In what respect does the wave pattern of a noise and music differ?
Does the wave pattern of musical sounds contain only harmonics (other than the fundamental frequency) while noise contains random overtones (that are not harmonics)?
- 1,064
1
vote
2
answers
85
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Signal Processing – Discrete Fourier Transform and Incomplete Fourier Series
I'm working on a paper where I'm collecting sound pressure data from a chord's wave and trying to create a frequency spectrum to find the individual frequencies that make up the chord.
However, I can'...
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19
votes
6
answers
3k
views
Can we quantify the pitch of a sound that is a mixture of many frequencies?
How is the pitch of a sound defined quantitatively when it is a mixture of many frequencies? For example, the sound emitted by a plucked guitar string, or say, the pitch of somebody's (normal) voice. ...
- 11.8k
1
vote
0
answers
37
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Difference Between a Time-Domain and a Simulation Domain Acoustic Pressure Simulation
I would appreciate it if someone would be able to clarify my doubts. I'm currently working on acoustic simulations in COMSOL and is currently confused on the information provided by the simulations ...
- 11
1
vote
2
answers
163
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Is the human singing voice different from a linear, time-invariant (LTI) system?
Typically the human voice is modelled by a linear, time-invariant (LTI) system.
An LTI system cannot add any frequency components to an input signal. This is obvious from the input-output relation in ...
- 111
2
votes
1
answer
381
views
Why can't you filter out the sound of running water using noise-cancelling software?
The book "Clint Emerson - 100 deadly skills", a fun illustrated book of spy techniques claims the following:
Deadly skill No 054, Civilian BLUF:
While noise-canceling software can override ...
- 143
1
vote
1
answer
96
views
Can we decompose sound like white light is decomposed (dispersed) in different colors?
When we send white light through a prism, the light is decomposed in the colors that constitute it due to the different velocities which different frequencies. Is there a way to decompose "white ...
0
votes
0
answers
66
views
In square wave modulation: should the low frequency part of the graph not take place in the low amplitude part of the pulse?
I try to get my sound program right, and hoped to find some help here with the understanding of frequency modulation by a square wave.
My modulation looks like this: (please excuse if my formula ...
- 101
-2
votes
1
answer
2k
views
Why does a running fan causes some soundproofing in the room?
I notice that when I switch on my fan inside my room, the room becomes soundproof to a great extent to the outside noises. The greater is the speed of the fan, the greater is the soundproofing.
When ...
- 2,517
2
votes
1
answer
43
views
Why are an audio signal and its cochlear response modelled as two-dimensional variables?
According to Eguíluz et al, amplification of an incoming audio signal by the human ear can be described by a supercritical Hopf-bifurcation
$$\dot x(t) =(\lambda-i\omega_0-|x(t)|^2)x(t)+S(t),$$
...
- 121
0
votes
1
answer
103
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How to solve this problem involving the "longest interval"?
The problem is shown as follows:
If one wants to make a digital record of sound such that no audible information is lost, what is the longest interval, $\Delta t$, between samples that could be ...
2
votes
0
answers
86
views
The validity of some "applications" of the uncertainty principle
Given a $L^2$ function $f$ with $\int_\mathbb{R}xf(x)dx=0$, define its variance to be $\sigma_f^2=\int_{\mathbb R}x^2f(x)dx$. The uncertainty principle states that $\sigma_f\sigma_\hat f\geq 1/4\pi$,...
- 1,335
2
votes
3
answers
313
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Can a sound wave begin with rarefaction?
Some digital recording samples (audio files) of recorded acoustic sounds present sound waves which begin with rarefaction. Is this an actual phenomena that can occur or is it a result of sound ...
- 23
1
vote
0
answers
63
views
Fourier Coefficients
Suppose i've a two voice samples v1 and v2. Comparatively voice v1 is louder than the v2. If both the voice is spoken by the same person.(Spoken normally as he speaks)
Is it good to state the ...
- 121
1
vote
2
answers
147
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How does ultrasound work? How is the signal processed?
Why is ultrasound 2D? Is there a way of making ultrasound 3D without piecing together 2D? How close is ultrasound to sonar?
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