All Questions
Tagged with signal-processing acoustics
13
questions with no upvoted or accepted answers
3
votes
1
answer
112
views
Is it possible to estimate the number of people in a room from a limited number of simultaneously recorded audio samples?
Note: I struggled to decide the appropriate site for this question, between https://physics.stackexchange.com/, https://video.stackexchange.com/, https://math.stackexchange.com/, and even https://...
- 679
2
votes
0
answers
86
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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
1
vote
0
answers
86
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Modeling an Acoustic Reflection from a Wall
I am trying to simulate the reflection of a sound ray, that goes from a sound source, bounces off a wall, and is received by a microphone.
The wall has a an absorption coefficient, and a specular ...
- 11
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
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
1
answer
99
views
Multilateration of Sound in 3D Space
TL:DR - How can you find the 3D coordinates of a emitter than transmits an impulse signal?
STORY:
I'm working on something to improve my bird-watching. I've got a camera that can take pictures of ...
- 111
0
votes
0
answers
27
views
Comparison between wave equation theory and transfer function theory
I deal with analysis of acoustic signals in solids. And after some literature research in physics and mathematic, I have a question about the followings two theories:
Wave equation theory: Imagine I ...
0
votes
0
answers
21
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FWHM and Beam Width of transmitted beam of ultrasonic (ultrasound) transducer
Im a studying ultrasonic transducer and I got a question about FWHM and Beam Width while solving some problems.
In the lecture, I learned that Beam width is calculated by:
$2\Delta\theta = \frac{3.8\...
- 43
0
votes
0
answers
24
views
Is the strongest acoustic signal always the closest?
I have a single beam echosounder that I use to measure the distance to an object underwater. It emits an acoustic pulse and listens to the reflections. Using the time of flight and the strongest ...
- 1
0
votes
0
answers
66
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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
0
votes
1
answer
156
views
Interpreting FFT background noice
There is some construction down my street and I think the drills are putting off a high pitch noise so I downloaded a spectrum analyzer. they have an FFT plot here:
The "57-dB-A" I guess is the ...
- 101
0
votes
1
answer
59
views
Subtracting Audio from a Song with Multiple Forms
This question may start oozing into the realm of copyright infringement, but let's discuss the theory first and foremost.
I have a song with vocal and orchestral accompaniment from a well-known movie ...
- 109
0
votes
0
answers
39
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A sonar continuously emits x(t), a general but known waveform and is reflected by a target. hypothetical question
A sonar continuously emits x(t), a general but known waveform that is reflected by a target and received by the sonar. Both the sonar and the target move in the 3-dimensional space in a general but ...
