Saturday, December 26, 2015

Dielectric - Wikipedia, the free encyclopedia

Dielectric - Wikipedia, the free encyclopedia: "A perfect dielectric is a material with zero electrical conductivity (cf. perfect conductor),[5] thus exhibiting only a displacement current; therefore it stores and returns electrical energy as if it were an ideal capacitor."



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Saturday, December 12, 2015

Helmholtz decomposition - Wikipedia, the free encyclopedia

Helmholtz decomposition - Wikipedia, the free encyclopedia: "A terminology often used in physics refers to the curl-free component of a vector field as the longitudinal component and the divergence-free component as the transverse component"



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Differential structure - Wikipedia, the free encyclopedia

Differential structure - Wikipedia, the free encyclopedia: "Differential structures on spheres of dimension 1 to 20[edit]
The following table lists the number of smooth types of the topological m−sphere Sm for the values of the dimension m from 1 up to 20. Spheres with a smooth, i.e. C∞−differential structure not smoothly diffeomorphic to the usual one are known as exotic spheres.
Dimension 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Smooth types 1 1 1  ? 1 1 28 2 8 6 992 1 3 2 16256 2 16 16 523264 24
It is not currently known how many smooth types the topological 4-sphere S4 has, except that there is at least one. There may be one, a finite number, or an infinite number. The claim that there is just one is known as the smooth Poincaré conjecture (see generalized Poincaré conjecture). Most mathematicians believe that this conjecture is false, i.e. that S4 has more than one smooth type. The problem is connected with the existence of more than one smooth type of the topological 4-disk (or 4-ball)."



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Monday, November 30, 2015

Friday, November 27, 2015

impedance scaling factor 8.122 (p.p.126)



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Sunday, November 15, 2015

Simultaneous equations - Wikipedia, the free encyclopedia

Simultaneous equations - Wikipedia, the free encyclopedia: "In mathematics, a set of simultaneous equations, also known as a system of equations, is a finite set of equations for which common solutions are sought. An equation system "



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Friday, November 06, 2015

Hints for writing Unix tools

Hints for writing Unix tools: "$ ./runbenchmarks | awk '/^Benchmark:/ { bench = $2} bench=="fizzbuzz"'
"



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Friday, October 16, 2015

Saturday, October 10, 2015

Understanding Earphone / Headphone Specifications | Shure Technical FAQ

Understanding Earphone / Headphone Specifications | Shure Technical FAQ: "The sensitivity of earphones is usually in the range of 80 to 125 dB SPL/mW. Here is an example. An earphone's sensitivity is 122 dB SPL/mW. This means 1 mW of power will generate 122 dB SPL. "



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Friday, October 09, 2015

B&K Technical Review

artificial ears for the calibration of earphones of the external type



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Wednesday, September 30, 2015

Naiant Studio - PFA phantom power adaptor

Naiant Studio - PFA phantom power adaptor: "plug-in" power and other low-voltage (8V) lapel-style microphones via a balanced, low-impedance output to standard phantom-powered XLR "



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Saturday, September 19, 2015

Monday, September 14, 2015

define: as follows - Google Search

define: as follows - Google Search: "Whether the preceding matter is plural or not, as follows is always singular: The reasons for these decisions are as follows. To use as follow instead is sufficiently precious sounding to make your reader break stride: don't do it"



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Sunday, September 13, 2015





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Resonance of the Human Ear Canal

Resonance of the Human Ear Canal: "however, if one wishes to protect the ear and preserve the quality of the sound, ear canal resonance must be maintained.

There are two types of earplugs which can help maintain ear canal resonance, both produced by Etymotic Research: "



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Thursday, September 03, 2015

Wednesday, September 02, 2015

Statistical ensemble (mathematical physics) - Wikipedia, the free encyclopedia

Statistical ensemble (mathematical physics) - Wikipedia, the free encyclopedia: "The statistical formulation of the principle of locality is now seen to be a form of the Markov property in the broad sense;"



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Statistical ensemble (mathematical physics) - Wikipedia, the free encyclopedia

Statistical ensemble (mathematical physics) - Wikipedia, the free encyclopedia: "if it equally contains all past and future phases of the system. Such a statistical ensemble, that does not change over time, is called stationary"



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Tuesday, September 01, 2015

Sunday, August 30, 2015

Diminished seventh chord - Wikipedia, the free encyclopedia

Diminished seventh chord - Wikipedia, the free encyclopedia: "The diminished seventh chord normally possesses a "dominant" function, and this is most straightforwardly shown when the root of a dominant seventh chord is omitted. The remaining third, fifth and seventh of that chord form a diminished triad "



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Saturday, August 29, 2015

"G, A, F, (octave lower) F, C."



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Friday, August 28, 2015

Thursday, July 30, 2015

Delete character - Wikipedia, the free encyclopedia

Delete character - Wikipedia, the free encyclopedia: "There is no common method to input this character on modern keyboards, although in some environments (especially, Unix-like systems) the ← Backspace key or combination of Control and ← Backspace "



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Tuesday, July 28, 2015

- Why the Fuss about Plus? : Recording Magazine -

- Why the Fuss about Plus? : Recording Magazine -: "The Minirator polarity test waveform is a 20 Hz sawtooth. The voltage rises slowly up the ramp, then drops down very quickly. When translated to loudspeaker cone motion the cone moves toward the listener slowly"



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Sunday, July 26, 2015

windows 7 - Which special variables are available when writing a shell command for a context menu - Super User

windows 7 - Which special variables are available when writing a shell command for a context menu - Super User: "*) Following registry keys are created for this: [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shell\cmdshell] @=Open Command Prompt Here"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Directory\shell\cmdshell\command] @="cmd.exe /e:on /f:on /s /k pushd \"%V\"""



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Thursday, July 23, 2015

Sound localization - Wikipedia, the free encyclopedia

Sound localization - Wikipedia, the free encyclopedia:

Sound localization in the median plane (front, above, back, below)[edit]

Monaural cues[edit]

The human outer ear, i.e. the structures of the pinna and the external ear canal, form direction-selective filters. Depending on the sound input direction in the median plane, different filter resonances become active.


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Human, humans?

Human, humans?: "'we are human'-- 'human' is a predicate adjective, a subject complement.
'we are humans'-- 'humans' is a noun complement of the subject. "



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Friday, July 17, 2015

ProSound: Профессиональный звук

ProSound: Профессиональный звук: "Нужно ли говорить, что наушники NOCS NS900 LIVE - полностью закрытого типа, имеют сильную звукоизоляцию. В инструкции есть даже специальное предупреждение: "не слушайте музыку в наушниках, когда гуляете по улице с едущим рядом автотранспортом". Можно не услышать не то что мотор подъезжающего автомобиля, но и его сигнал.
Измерения АЧХ

При измерениях использовался программно-аппаратный комплекс RightMark™ Audio Analyzer PRO нашей разработки. Использовался измерительный стенд Brüel & Kjær 4153 - Artificial Ear/Ear Simulator (IEC 60318-1), Сделано в Дании, стоимость около 5000 евро. Измерения АЧХ приводятся в качестве справочных. Не стоит по ним угадывать звучание модели наушников! На АЧХ виден лишь диапазон частот и основные тенденции! Подъем АЧХ на НЧ у закрытых наушников сильно зависит от силы прижима чашки.
"



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Tuesday, June 30, 2015

Momentum - Wikipedia, the free encyclopedia

Momentum - Wikipedia, the free encyclopedia: "
If the force depends on time, the change in momentum (or impulse) between times t1 and t2 is
"



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Monday, June 08, 2015

Patent US7620188 - Cylinder responsive vibratory noise control apparatus - Google Patents

Patent US7620188 - Cylinder responsive vibratory noise control apparatus - Google Patents: " The 4-cycle 6-cylinder internal combustion engine therefore produces a lot of vibratory noise that is referred to as a rotational 1.5th-order component."



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Saturday, May 30, 2015

Acoustic and vibrations

Acoustic and vibrations: "The far field is divided into the free field and the reverberant field.

"



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Monday, March 09, 2015

Noise, vibration, and harshness - Wikipedia, the free encyclopedia

Noise, vibration, and harshness - Wikipedia, the free encyclopedia: "although they look like tonal problems on any one spectrum, their amplitude varies considerably"



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Friday, February 27, 2015

road noise frequencies on human perception, tonal components

The criterion adopted for identifying a tonal component was that the thirdoctave
band must reach a sound level of at least 4.75 dB above the adjacent third-octave bands



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Thursday, January 22, 2015

word usage - "At this time" vs "At that time" - English Language & Usage Stack Exchange

word usage - "At this time" vs "At that time" - English Language & Usage Stack Exchange: "So, more generally, "this" is something central and implicit in the statement; "that" by contrast is something more separate or which must be identified by location or time."



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Wednesday, January 21, 2015

Conditionals: other expressions ( unless, should, as long as ) - English Grammar Today - Cambridge Dictionaries Online

Conditionals: other expressions ( unless, should, as long as ) - English Grammar Today - Cambridge Dictionaries Online: "Providing (that) is more common in speaking; provided (that) is more formal and more common in written language:"



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日本語|げたにれの “日日是言語学” -4ページ目

日本語|げたにれの “日日是言語学” -4ページ目: "、「ひとひ」、「ふたひ」 という言い方が使われます。ただし、「みっか」 から先は “日の呼び名” と同じになるようです。つまり、「みひ」、「よひ」、「いひ」 という語形はない。"



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Thursday, January 15, 2015

MEMS Microphones Busting Out All Over | EE Times

MEMS Microphones Busting Out All Over | EE Times: "MEMS microphones are enabling a whole new tier of "always on" connected, handheld and wearable electronics that will eventually monitor not just our every sound but also those in the environment around us. As such, our devices will not only interpret our voice commands, hand gestures and even the emotions in our voice patterns, but will begin to anticipate our needs by listening to the activity around us and volunteering the information we need at the exact moment we need it."



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