Re: [Denemo-devel] Pitch recognition patch

[Jeremiah Benham]

Thanks so much for this patch and your contribution. I will study this
as soon as I can. I am very excited to check this out!

Thanks,
Jeremiah


On Sun, 2007-08-19 at 18:42 +0100, Richard Shann wrote:
> Here is the patch fixing the bugs listed in my last mailing and
> introducing pitch recognition entry for denemo.
> The rhythm entry stuff has been upgraded as well, especially in handling
> patterns with rests which get entered automatically now, and triplets
> can be entered via separate start triplet/end tuplet commands. The
> rhythm mode is now started via the mode menu.
> 
> The pitch recognition entry is invoked from the mode menu - it
> automatically invokes rhythmic patterns and a special keymap (which you
> can modify to your taste and save in .denemo).
> It works by recognizing pitches sounded into the microphone input of the
> soundcard and putting notes into the score. The notes are only entered
> into the score when the cursor is in the score area - the background
> turns a rather lurid yellow to indicate you are "live" in this sense.
> Additionally you get to see the pitches detected in the Pitch
> Recognition Window. The Pitch Recognition Window allows you to change
> the enharmonic range (e.g. whether Eb or D# should be entered) and to
> change various parameters that control the pitch detection.
> 
> The good news is that it works well - you can exploit your previously
> learnt skills to enter notes, which is a subtle thing, that you are
> actually conscious of the notes as music as you enter them. (I think a
> similar effect would be gotten by the computer sounding the notes back
> to you as you entered them at the keyboard).
> 
> The bad news you often only get to play tiny rhythmic phrases before you
> have to select a new rhythm, so its ok with one hand on, say, an
> electric piano and the other hovering over the keyboard, but not so good
> with, say, the guitar.
> 
> Also though it works very well with instruments with a distinct attack
> the recorder struggles to make itself understood.
> 
> My experience with this suggests to me that the rhythmic pattern mode
> should probably become the default mode of denemo - even without using
> user-defined patterns it reduces typing because repeated durations are
> more common in music than repeated notes of varying duration.
>  
> The pitch recognition will really come into its own when you can enter
> all the durations for the piece (as a kind of rhythm track - appearing
> on the clef just like the music but all on one note) and then play the
> piece over the top, so that as you play it in you can see the music
> writing itself. This is not completely trivial, owing to denemo's
> convoluted internal organs, but it is only a whisker away. Then we will
> have achieved something which I suspect is state-of-the-art - entering
> music in the time required to play it through twice.
> 
> On the technical front: the pitch recognition stuff requires libaubio
> and libportaudio, and I haven't figured out how you get these configured
> in to the system - I've just built it by adding -laubio etc to the
> LD_FLAGS in the src/Makefile
> The diffs will have (judging by the ChangeLog) reverted a change which
> they shouldn't have in src/prefops.c - I believe I have taken care of
> all other changes that have taken place since I started on this
> development.
> 
> Any comments - particularly on the proposal to develop a two-pass music
> entry scheme - most welcome.
> Richard
> 
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