Double b
In music, the double b or double b ( ) denotes the lowering of a root note by two chromatic semitones . The symbol consists of two simple ♭ written closely together . It is written either on a line or a space on the staff and alters the note on that pitch. If the tone to be lowered is on an auxiliary line , the double Be is placed in front of the auxiliary line.
To name the altered tone, the ending -eses is added to the tone name of the root tone . Exceptions: E becomes Eses , A becomes Asas or Ases . H, on the other hand, becomes Heses , not Bes .
The symbol is used as an accidental and is only valid in the measure in which it is notated and only in the notated octave range . In contrast to the simple ♭ , it is never used as a sign .
For example, consider the following series of descending thirds: c 1 - a flat - fes , the next note in the series would then be deses . In pure thirds these tones would have the following ratios: 1/1, 4/5, 16/25 and 64/125. Thus, deses 1 in the mid-tone tuning would have a ratio of 128/125 to c 1 . With a frequency of c 1 = 261.626 Hz, deses 1 then corresponds to 267.905024 Hz.
Representation in computer systems
In the international Unicode character coding system , the ? is in position:
- U + 1D12B
however, it is not displayed correctly on all computer systems.
In LaTeX - more precisely the variants LuaLaTeX and XeLaTeX , which are both able to use OpenType fonts - the character can be entered using the syntax with the lilyglyphs package \flatflat.
See also
Individual evidence
- ↑ lilyglyphs in the CTAN
- ↑ Scott Pakin: The Comprehensive LaTeX Symbol List. (PDF, 8.7 MB) January 19, 2017, p. 151 , archived from the original on September 28, 2017 ; Retrieved on September 28, 2017 (English, linking the original results in a mirror of CTAN , the archive link compare file: Comprehensive LaTeX Symbol list.pdf ).