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演奏音阶 () () 拍
演奏音階 (60 v) (0.5) 拍
类别 Sound
形狀 条形积木

The Play Note () for () Beats 积木 is a 音效类积木 and a 条形积木. The block will play the specified note with a set MIDI instrument for the specified amount of beats.

Prior to Scratch 1.2, this block used to be called Play Note () for () Secs, but was changed because the length of a beat can now be changed with the 演奏速度设为 () bpm block.

用法示例

As the block plays a note, it is widely used when a song is played with the 音效类积木.

Some common uses for the Play Note () for () Beats block:

  • Easy sound effects (numbers above 88 still work); very high and low notes make interesting sounds
重複直到 <(x) = [0]> 
  演奏音階 (x 座標) (0.1) 拍
  變數 [x v] 改變 (-1)
end
  • Musical projects where you control instruments
重複無限次 
  演奏音階 ((滑鼠游標的 y) 除 (129) 的餘數) (0.1) 拍
end
  • Creating a song made by blocks
重複 (2) 次 
  演奏音階 (62 v) (0.5) 拍
end
重複 (2) 次 
  演奏音階 (69 v) (0.5) 拍
end
重複 (2) 次 
  演奏音階 (81 v) (0.5) 拍
end
演奏音階 (69 v) (0.5) 拍

Notation

The Play Note () for () Beats can sometimes be tricky to get used to since the notes and rhythms are notated with numbers, unlike sheet music. These diagrams may help:

Notes

The note names are written on the keys. Notes written in the two most common clefs (Treble clef and Bass clef) are connected to the piano. All notes can be written in an infinite number of ways. The most common enharmonic notes are included. A line going from a long red box means the notes go to the same key on the piano. Even though the drop-down keyboard shows only two octaves of notes (48 to 72), a number can be put in manually to get any note. To change octaves, simply add or subtract 12.

There are 128 notes on the MIDI keyboard, numbered from 0 (C-1, about 8.18 Hz) to 127 (G9, 12500 Hz). Each note is 1 higher than the previous, and the ratio of frequency is always 122 (approximately 1.06), with A4 being 440 Hz.

Clef Note MIDI number Frequency
Bass C3 48 131 Hz
C♯3/D♭3 49 139 Hz
D3 50 147 Hz
D♯3/E♭3 51 156 Hz
E3 52 165 Hz
F3 53 175 Hz
F♯3/G♭3 54 185 Hz
G3 55 196 Hz
G♯3/A♭3 56 208 Hz
A3 57 220 Hz
A♯3/B♭3 58 233 Hz
B3 59 247 Hz
Base and Treble C4 (middle C) 60 262 Hz
Treble C♯4/D♭4 61 277 Hz
D4 62 294 Hz
D♯4/E♭4 63 311 Hz
E4 64 330 Hz
F4 65 349 Hz
F♯4/G♭4 66 370 Hz
G4 67 392 Hz
G♯4/A♭4 68 415 Hz
A4 69 440 Hz
A♯4/B♭4 70 466 Hz
B4 71 494 Hz
C5 72 523 Hz

Beats

This table shows the beat number values for the most common rhythms in the most common time signatures, interpreted in the most basic way.

WholeNote.png DottedHalf.png HalfNote.png DottedQuarterNote.png QuarterNote.png QuarterTriplets.png Dotted8th.png 8thNote.png 8thTriplets.png Dotted16th.png 16thNote.png
TimeSig4.png 4 3 2 1.5 1 0.67 0.75 0.5 0.33 0.375 0.25
TimeSig8.png 8 6 4 3 2 1.33 1.5 1 0.67 0.75 0.5
TimeSig2.png 2 1.5 1 0.75 0.5 0.33 0.375 0.25 0.167 0.1875 0.125

参见