Hey hey,
I'd like to "quantise" both MIDI notes and frequencies to musical scales. I 
suppose cpstun is a tool for the latter.

But is there a good realtime capable method to quantise MIDI notes to a MIDI 
note scale? I thought about a table lookup with 127 elements, which is created 
from some kind of short description.

Does anyone have ideas on these topics or a good pointer? Most of my research 
discovered such features in DAWs.

Best wishes and many thanks,

Jeanette

-- 
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how would you do this search ("either linear search or binary")?


On 31/12/2021 13:07, John ff wrote:
> Not sure I understand what you need but a lookup table to take MIDI 
> number to frequency is fast and simple.
> 
> If on the other hand you have a frequency and you want to quantise it to 
> a scale then a table   can be searched to find the nearest value, either 
> linear search or binary.
> 
> Get TypeApp for Android 
> On 30 Dec 2021, at 21:23, "Jeanette C."  > wrote:
> 
>     Hey hey,
>     I'd like to "quantise" both MIDI notes and frequencies to musical scales. I
>     suppose cpstun is a tool for the latter.
> 
>     But is there a good realtime capable method to quantise MIDI notes to a MIDI
>     note scale? I thought about a table lookup with 127 elements, which is created
>     from some kind of short description.
> 
>     Does anyone have ideas on these topics or a good pointer? Most of my research
>     discovered such features in DAWs.
> 
>     Best wishes and many thanks,
> 
>     Jeanette
> 
> Csound mailing list Csound@listserv.heanet.ie 
>  
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND 
>  Send bugs reports to 
> https://github.com/csound/csound/issues 
>  Discussions of bugs and 
> features can be posted here

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Thanks all. I'm going with the lookup table for MIDI notes.

For pitches I'm slowly leaning towards one solution, but it will be limited to 
the western scale. It's not completely worked out yet, but:
iPch = cpspch(iFreqInHz)
iOct = int(iPch)
iOriginalDegree = frac(iPch)
iQuantisedNote = int(iOriginalDegree * 100) ; (ranges 0-11.x)
Then use a lookup table, create a new pch pitch and convert back to cps. Does 
that sound reasonable?

Best wishes,

Jeanette

Dec 31 2021, Forrest Curo has written:

> Not knowing about cpstun, I just calculated:
> ifreq = girats[giscale[idegree]] * 2 ^ ioct * gifund ; NOT 'ifreq mtof ikey'
> where 'girats' was an array of just-tuning ratios for one octave (one for
> each 'idegree' of a scale), and ioct was the octave of the midi note being
> played.
>
> The degree was midi % 12, the octave (int (midi/12)) -- Or int(midi % 8),
> if I'd simplified a scale down to 7 degrees mapped to the white keys, say.
> (Convenient for a pianistically-impaired player like me):  gidegree[]
> fillarray 0, 0, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6
>
> Any help?
>
>
> On Fri, Dec 31, 2021 at 4:13 AM joachim heintz  wrote:
>
>> how would you do this search ("either linear search or binary")?
>>
>>
>> On 31/12/2021 13:07, John ff wrote:
>>> Not sure I understand what you need but a lookup table to take MIDI
>>> number to frequency is fast and simple.
>>>
>>> If on the other hand you have a frequency and you want to quantise it to
>>> a scale then a table   can be searched to find the nearest value, either
>>> linear search or binary.
>>>
>>> Get TypeApp for Android 
>>> On 30 Dec 2021, at 21:23, "Jeanette C." >> > wrote:
>>>
>>>     Hey hey,
>>>     I'd like to "quantise" both MIDI notes and frequencies to musical
>> scales. I
>>>     suppose cpstun is a tool for the latter.
>>>
>>>     But is there a good realtime capable method to quantise MIDI notes
>> to a MIDI
>>>     note scale? I thought about a table lookup with 127 elements, which
>> is created
>>>     from some kind of short description.
>>>
>>>     Does anyone have ideas on these topics or a good pointer? Most of my
>> research
>>>     discovered such features in DAWs.
>>>
>>>     Best wishes and many thanks,
>>>
>>>     Jeanette
>>>
>>> Csound mailing list Csound@listserv.heanet.ie
>>> 
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>>  Send bugs reports to
>>> https://github.com/csound/csound/issues
>>>  Discussions of bugs and
>>> features can be posted here
>>
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>         https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
>>
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here
>

-- 
  * Website: http://juliencoder.de - for summer is a state of sound
  * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
  * Audiobombs: https://www.audiobombs.com/users/jeanette_c
  * GitHub: https://github.com/jeanette-c

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