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3:14 AM
So, uhhh... are we going to decide on a challenge idea?
 
3:40 AM
Personally, out of all the ideas so far I think I like either Peter's sine wave idea or the music chord idea, the latter merely being the extension of the former
Audio processing's probably unfamiliar territory to many people, so I'd imagine that some of the other ideas might be too hard (e.g. encoding images and making it sound good)
 
 
7 hours later…
11:04 AM
I also like the sine wave, but it's a bit of shame that it doesn't actually require the input to be an audio file.
Could we maybe come up with one or two follow-up challenges that would build on the first one, but which are then actually more related to audio?
 
Sine wave -> Chords -> Time stretch with pitch correction seems like an okay difficulty curve
Or replace chords with Score a simple melody
 
I still really like the scoring a simple melody idea, but it's probably quite involved... (even if you already have code to recognise a single sine wave... especially since any form of listenable input would probably include multiple octaves instead of single sine waves). what if we could build up to that with a couple more challenges?
I can't find any graphical output to print scores... only some related ASCII art
 
It could always be just the note, e.g. C4, A#5 unless you want to take durations/graphical output into account
 
well yeah, durations would be nice... as would graphical output. another interesting component could be recognising time signatures (which is only feasible to add if you already have some code to recognise notes from a previous challenge)
 
I was thinking duration might be hard because it'd probably involve finding the song's tempo - unless you're thinking of something else?
 
11:19 AM
@Sp3000 well the tempo could be provided. or you could include a click or 4 distinctive beats at the beginning.
 
Ah, I see
 
(but then again I'm slightly obsessed with time signatures, because it's the one part of music theory I can actually determine from hearing... as opposed to chord progressions and stuff... :D)
 
(Personally I'm obsessed with BPM instead :P)
(But yes I can never guess notes/chords correctly...)
 
@Sp3000 lol, not my thing at all
 
:P
 
11:24 AM
I'd prefer slow music if it's in 29/8 :D
 
Hmm I wonder, how do you recognise time signatures with a program
Especially if it changes
(What on earth did you hear that was in 29/8!?)
 
well it might be several shorter bars of different length that are alternating/cycling, but the shortest repetition in rhythm is after 29 beats. the second half of this track: youtube.com/watch?v=8JdO4yg0_8U
 
Wow that's tough. I keep tapping to 3/4 but then the notes start again on the wrong beat
 
these guys have some crazy time signatures... here is a rather dance-y song in 17/8: youtube.com/watch?v=Adz32EMA_M8
but yeah, how would you recognise that with code :D
 
You'd have to look for patterns in the music somehow - where the beats are
But not get screwed over by offbeats
At first I was thinking what's so hard about recognising time signatures but I've never seen anything with a numerator above 12 that wasn't some obscure piano piece
Wow I can't even tap along properly
 
11:32 AM
I think what would really throw you off is triplets
 
Ooh... yeah that too
 
and then there's polyrythmic stuff... :D
 
Heh.
 
like that 4/4 beat setting in over 6/8 at 4:30 (although I guess you could just write that as 12/8) youtube.com/watch?v=vT-8bQzkZec
 
I'm trying to find the worst case I can find and apparently this song "is the only song [in this game] that lacks measure markings and thus a time signature."
I question the "song" part though
Hmm yeah sometimes I wonder where the line is between, say, 3/4 and 6/8 and 12/8
Yeah that polyrhythmic one...
Sounds like whoever can work out time signatures should really win a medal
(Of course, we could always restrict to a classifier between, say, 3/4 and 4/4 if we were actually writing a question. Bit of a letdown though)
 
11:49 AM
@Sp3000 haha, that's crazy
@Sp3000 I don't think things like 5/4 would be much trouble for a program that can recognise 3/4 and 4/4. I think it would be enough if you just ruled out a change in time signature and provided a sufficiently long sample
 
Well I guess it's extensible to a set of pairwise coprime integers for the numerator
But yeah no changes and long enough sample - could work
(btw apparently there's a TVTropes page: tvtropes.org/pmwiki/pmwiki.php/Main/UncommonTime)
 
12:05 PM
@Sp3000 there's also a list on some wikipedia user's own page
 
Oh wow, sorted
111/4 and 142/8 I think some people just want to claim records :P
 
:D
o.O All You Need is Love is mostly in 7/4
 
1:03 PM
"Output an audio file with which contains the morse code of 2015."
(in any speed and frequency, as long as it's recognisable to human ears, as determined by a positive net score of your answer)
(for reference, that's ..--- ----- .---- .....)
 
 
1 hour later…
2:26 PM
Should we have hard number ranges for the speed and frequency?
 
maybe a few limits are good
like a minimum length difference between short and long segments and breaks and a maximum duration for the entire file
 
Something like that, yeah
 
limits on frequency could be hard, because I would want to allow chords, noise, instruments (midi)
 
Makes sense, entire file length makes more sense anyway
 
@Sp3000 how do you like it in general?
 
2:40 PM
I think it works. Just make sure to put extra emphasis on audio files and not, say, system beeps.
Should there be a minimum beep length?
 
I think we could still pursue the idea of a multi-part challenge to generate scores, but I think it needs more thinking (and possible audio-processing expertise) then we can come up with in 2 days.
@Sp3000 probably
 
I think the idea's workable, should we start on a draft?
 
sure, I can write something up
oh wait
4
Q: Morse code generator in sound

PhillipInspired by the Morse code question, and the Twinkle Twinkle little star question, write a program to accept a letter and generate the morse code audio for that letter.

 
Hm...
 
the answers all seem to beep though
 
2:50 PM
You could still be able to post a different Morse challenge — that one has almost no specification, and you could add some interesting things to your own (i.e. specifying a pitch, etc.)
 
@Doorknob冰 as I said earlier, I'd rather leave that unspecified to allow noise, instruments via midi etc. but I think since that question prompted only beeping answers they might be sufficiently different anyway if we disallow beeps
 
Oooh, idea: the input should be a song (somehow, maybe MIDI) and a message, and the message should be encoded in Morse code with the pitches of the beeps matching the song's tune
 
I don't know much about the midi format, but I think this might be fairly trivial (beyond the morse encoding, which has been done before)
 
3:04 PM
first draft:
4
A: Sandbox for Proposed Challenges

Martin BüttnerWeekly Challenge #1 - Audio Processing Join us in the Weekly Challenge Chat to work out the details of this challenge! Proposal 1 - Morse the New Year audiokolmogorov-complexity(morse I think we could use a tag for this) Your task is to write a program, which outputs an audio file (in a forma...

 
Is this golf?
 
oh yeah
I knew I forgot something :D
 
 
2 hours later…
5:23 PM
so... how do we play back the files? ^^
I think SE has some collaboration with SoundCloud as they do with imgur for uploading and embedding files. That feature is not activated on PPCG, but maybe we can use the uploading regardless and provide an example Stack Snippet which embeds the SoundCloud link?
 
 
3 hours later…
8:21 PM
Can I use system beeps if I record them with the microphone and write it to a file? — feersum 1 hour ago
 

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