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- 相对于 Matlab，Octave如何? - 知乎
octave唯一的优点也就是占内存小了（< 500M），然而不知是不是安装的姿势不对，每次打开软件 跑个小命令，简直比PS和AE还慢。 Matlab 要流畅很多，而且功能齐全，用的人多所以社区环境好，计量和机器学习包括金融工程都可以，唯一的缺点就是实在太占内存了。
- piano - What is an octave? - Music: Practice Theory Stack Exchange
The actual values that delimit a musical octave are determined by the tuning convention being used: An octave is usually not exactly tonic frequency x 2 but hovers around that value - a close enough approximation so that most ears discern octave equivalence [further explained later on] within that range
- Why are there twelve notes in an octave? - theory
Well the octave represents a doubling halving of hertz (cycles per second) So, midi middle C is 256 hz, and if you know your computer numbers, you'll realise that the next octave C's are at 512, 1024, 2048, etc and the lower octaves are at 128, 64, and (pimp your ride) 32 Earthquakes, by the way, show up at around 11 hertz
- practice - Fingering for octaves on the piano - Music: Practice . . .
Another good trick is to jump up with the left hand and play the first octave of every triplet as only the bottom note of that octave Using the left hand of course This actually produces a wonderful musical effect that even more closely resembles a galloping horse than the original octave figuration Octaves are hard! Good luck!
- Ottava markings - Should this 8va be 8vb?
8va is an abbreviation for "ottava" ("octave" in Italian) and is commonly used both for higher and lower octave shifts The key difference is the placement of the dashed line: aligned to the top for "octave higher" and aligned to the bottom for "octave lower" 8vb is also sometimes used to indicate an octave lower
- sheet music - Is 16va proper notation? - Music: Practice Theory . . .
Because pitch measurement systems (linear and logarithmic) are derived from the octave as 2:1, a double octave represented as 16va (16:8 = 2:1) is a notation evolution surpassing music theory symbols based on an outdated, extended modal scale series, like 15ma
- Does an accidental apply to all octaves? - Music: Practice Theory . . .
In Bar 21 of Chopin's waltz in A minor the 8th note in the right hand is an interesting case in that it is a G at the start of an octave higher section which is clearly intended to be a G♯, as the previous occurrence of the note at that position in the stave but not an octave higher - and all the other Gs in the bar - are sharp, but arguably
- theory - Parallel octaves vs doubled octaves - Music: Practice Theory . . .
A parallel octave refers only to two consecutive notes! Octave doubling If you have two or more instruments that are intentionally arranged to play the same voice (in unison or) one or more octaves apart, then you have octave doubling, which gives you a fat sound Octave doubling refers to longer passages of music; most likely at least a full
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