User:Omegatron

I am an electrical engineer, in my first real job (pro audio electronics), so I am somewhat inexperienced. I also enjoy music; listening (experimental electronic, metal, indie rock or whatever), creation (computer synthesis/recording, homemade electric violin), and performing. Articles I contribute to will probably be related to these things.

If I do anything wrong or impolite please let me know.

Articles I am currently working on or plan to work on (and notes to myself):

• Physics of music
  • even and odd harmonics, wave symmetry, audiophiles etc?
• Spectrogram
  • Short term Fourier transform
    • add info about the mathematics behind it. eek!
• Operational amplifier
• Heat transfer
• Thermoelectricity? Peltier-Seebeck effect could use more work or description
• Audio time stretching
  • rename to more general?
  • "timescale modification"? - not always stretching, not even necessarily a constant value
  • "timescale/pitch modification? too long?
  • ask in talk page
• Chirp

A linear chirp waveform

• • geometric and linear equations and description
  • f(t) = f₀ + f×k×t ?
    • should be $f(t)=f_{0}+kt$
    • where f₀ is the starting frequency (at time t=0), and k is the rate of frequency increase.
    • the corresponding function of time for a sinusoidal chirp is:
    • $x(t)=\sin(2\pi f(t)t)=\sin(2\pi (f_{0}+kt)t)$

An exponential chirp waveform

• • a general geometric or exponential chirp will have frequency of:
    • $f(t)=f_{0}k^{t}$
    • where k is the rate of exponential increase of frequency
    • the corresponding function of time for a sinusoidal chirp is:
    • $x(t)=\sin(2\pi f(t)t)=\sin(2\pi f_{0}k^{t}t)$
  • In an analogue sonar, the signal might be generated by a voltage controlled oscillator (VCO), with the control voltage changing smoothly with time to produce a signal which has a frequency that changes continuously with time.
  • In a digital sonar, the signal might be generated by a DSP+DAC combination. It could be that the frequency is updated every complete cycle of output (which itself would change over time), but more likely that it is changed every sample, perhaps by varying the increment applied to the phase variable in the sinusoid generation function. This would create a signal with characteristics similar to that produced by a VCO.

• list of nuclear accidents
  • add articles for these?:

U.S. Navy's Definition of Nuclear Weapon Accident

Nucflash

Any accidental or unauthorized incident involving a possible detonation of a nuclear weapon by U.S. Forces which could create the risk of nuclear war between the U.S. and the U.S.S.R.

Broken Arrow

The accidental or unauthorized detonation, or possible detonation of a nuclear weapon (other than war risk);

Non-nuclear detonation or burning of a nuclear weapon;

Radioactive contamination;

Seizure, theft, or loss of a nuclear weapon or component (including jettisoning); Public hazard, actual or implied.

Bent Spear

Any nuclear weapon significant incidents other than nuclear weapons accidents or war risk detonations, actual or possible.

Dull Sword

Any nuclear weapon incident other than significant incidents.

Faded Giant

Any nuclear reactor or radiological accidents involving equipment used in connection with naval nuclear reactors or other naval nuclear energy devices while such equipment is under the custody of the Navy.

http://www.cdi.org/Issues/NukeAccidents/accidents.htm

That is all.