1 Jan
2022
1 Jan
'22
11:46 p.m.
Hi Jeanette,
If you want to reduce the amount of table elements, you could calculate
the offset from the key base note, take it mod 12 and have a 12-element
array for every scale you want to implement (pseudo-C ahead):
bool minor[] = [true, false, true, true, false, true, false, true,
true, false, true, false];
uint32_t offset = 2; // key: D
// add offset instead of subtract to ensure the result is positive
uint32_t additive_offset = 12 - offset
uint32_t index = (note + additive_offset) % 12;
if minor[index]
play_note(note);
Won't probably make much of a difference in performance really, but it
should make it easier to implement all scales in all keys.
Hope that helps! :)
keep grooving
Roman
P.S. Duplicate because I sent with the wrong email address first ;)
"Jeanette C." <julien(a)mail.upb.de> writes:
Gopod morning Fons!
Dec 31 2021, Fons Adriaensen has written:
...
There is code doing this [quantise frequency to
scale] in zita-at1 (the autotuner). It has some
refinements such as an optional preference for the previous note.
I will look this up and isolate it - it may be difficult to find
as it is integrated with other functionality.
Many thanks, this is great! You are,
as always, very kind.
Best wishes,
Jeanette
Ciao,
--
FA
--
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