Questions tagged [resonance]
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21 questions
0 votes
0 answers
58 views
How to resonator IIR filter coupling like Chromaphone?
I have successfully implemented Chromaphones models in an open source synth: https://forum.cockos.com/showthread.php?t=297784 However I am running out of ideas trying to implement filters coupling as ...
- 111
2 votes
0 answers
46 views
What is the cleanest, most transparent way to rapidly excite a resonant bandpass to a given amplitude (for musical synthesis)?
Background Music audio synthesis can be performed using underdamped resonant bandpasses as harmonic oscillators (set to harmonic frequencies of a given note). These can then be excited when input ...
- 553
2 votes
1 answer
125 views
What does the frequency of oscillating microphone feedback depend on?
Pointing a microphone to a connected loudspeaker creates a feedback path and usually results in acoustic resonance, which manifests in a sustained oscillation: https://youtu.be/_XTtjZ8aZbc. A similar ...
- 23
3 votes
3 answers
568 views
How can the location of the resonant peak in RBJ's shelving filters be calculated?
I'm attempting to use the low- and high-shelf filters from robert bristow-johnson's Audio EQ Cookbook1 for a filter that will have a pronounced peak - high $Q$, with a range of up to +24dB. The goal ...
- 133
1 vote
0 answers
92 views
Can an unwrapped phase lag diagram have values beyond $-\pi$ to $\pi$?
I have a PLL that tracks the phase lag of a resonance system. When unwrapped, my system's phase lag has values beyond $-\pi$ to $\pi$. After unwrapping phase lag, are there any bounds on the phase ...
- 111
3 votes
1 answer
270 views
Why is my resonance phase lag discontinous?
I am programming a phase-locked loop to track the resonance of a tuning fork so that the tuning fork is always on resonance. This will be used in condensed matter physics through atomic force ...
- 111
0 votes
1 answer
224 views
How to detect resonance with DFT
In the last paragraph of this article, the author gives an example of the DFT of a song and his window's resonant frequency. As he points out (and it is a bit intuitive), if he listens to this song, ...
- 103
1 vote
1 answer
121 views
Using Neural Network for locating shifting resonant frequencies
I have multiple FFT's taken from a sample at different pressures, through different analysis I can see that the resonant frequencies are shifting in the spectrum for each FFT at a different pressure. ...
- 11
1 vote
1 answer
2k views
What is the step response curve of a second order low pass filter? And what if it is set for resonance?
I am doing a lot of audio synthesis DSP where I need to use low pass filters to shape the decay of an impulse. I understand that a one pole filter fed a discontinuity, say from a steady state of 1's ...
- 553
0 votes
1 answer
622 views
Why is my filter unstable and self-oscillating in this case?
I am using resonant bandpasses to simulate modes of guitar/piano strings for audio synthesis. While attempting to introduce coupling effects I have encountered a problem. I will illustrate with some ...
- 553
0 votes
1 answer
406 views
Modal analysis and frequency response function - interpretation needed
For couple of weeks now, I have been trying to measure cutting forces during machining processes. The system which I am currently examining is highly distorted at high frequencies due to its ...
- 3
2 votes
0 answers
79 views
Coupling two resonant bandpass filters? (To simulate guitar/piano string effects)
A major part of the sound of a guitar or piano string comes from the coupling of the horizontal and vertical string vibrations. This concept is described in terms of transfer functions here. This ...
- 553
1 vote
0 answers
168 views
Measure resonant frequencies from system output data
Suppose I have a real (physical) dynamical system with one capacitive sensor, and I also have the ability to extract data for this system in csv form. The system data output is shown below (graphs) ...
- 11
4 votes
1 answer
106 views
Artefacts from playing ultrasound through PA system
I encode data in audio by energising 5 frequencies between 17.5kHz and 19.5kHz: I play the ...
- 1,329
2 votes
4 answers
139 views
What is the moment when all oscillators aligned to make a jump called?
Say we have a square wave and its Fourier series. When the wave doesn't jump, its oscillators aren't aligned: But if they are aligned, the wave will jump: What is this moment called? They might not be ...
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