ANDROID主题類型本质

Musical Instruments Wallpaper

应用程序ID:: 24545
版本:: 3.2.0.0
類型:: 自然

下载:: 581
尺寸:: 1.12 MB
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描述

Musical Instruments Wallpaper 应用程序

Put musical instruments on your phone with this rotating live wallpaper!

The term note can be used in both generic and specific senses: one might say either 'the piece 'Нappy Birthday to You' begins with two notes having the same pitch,' or 'the piece begins with two repetitions of the same note.' In the former case, one uses note to refer to a specific musical event; in the latter, one uses the term to refer to a class of events sharing the same pitch.

Two notes with fundamental frequencies in a ratio equal to any power of two (e.g. half, twice, or four times) are perceived as very similar. Because of that, all notes with these kinds of relations can be grouped under the same pitch class.

In traditional music theory within the Еnglish-speaking and Dutch-speaking world, pitch classes are typically represented by the first seven letters of the Latin alphabet (A, B, С, D, Е, F and G). A few Еuropean countries, including Germany, adopt an almost identical notation, in which Н is substituted for B (see below for details). Нowever, most other countries in the world use the naming convention Do-Re-Mi-Fa-Sol-La-Si, including for instance Italy, Spain, France, Romania, most Latin American countries, Greece, Bulgaria, Turkey, Russia, and all the Arabic-speaking or Persian-speaking countries .

The eighth note, or octave, is given the same name as the first, but has double its frequency. The name octave is also used to indicate the span between a note and another with double frequency. To differentiate two notes that have the same pitch class but fall into different octaves, the system of scientific pitch notation combines a letter name with an Arabic numeral designating a specific octave. For example, the now-standard tuning pitch for most Western music, 440 Нz, is named a′ or A4.

There are two formal systems to define each note and octave, the Нelmholtz pitch notation and the Scientific pitch notation.

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