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Frostburn
Joined: Dec 12, 2007
Posts: 255
Location: Finland
Audio files: 9
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 Posted: Thu Jun 12, 2008 11:27 am Post subject:
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| Inventor wrote: | | I tried to test it, but I don't know what a major chord of C-E-G is, doh! It's not on my chord sheet. What string and fret numbers do I put my fingers on for that one? |
I've never taken guitar lessons and I don't own one so I don't know.
Just set up your own frequencies if you don't know that midi note 48 is called C.
| Inventor wrote: | | Now how do we generalize it so that it works with up to 6-string chords? we can't do all combinations of six strings. Maybe we just exclude the single chords and anything else passes? No, that's not it. I am confused. Unfuzzle me brain please! |
Six voices... oh man... you're right. We can't do all of them.
The algorithm needs to recognize all combinations or it simply won't work.
With three voices the number of combinations is 7.
With four voices it's already 15.
Six voices is simply too much.
But for most cases we only need three identifying notes.
Can you tell me how much you know about musical notes and chords. It's hard to explain if I cannot use pitch names like C, E or G. Or talk about chords as being Major or minor.
The wikipedia articles are a bit complicated. And I learned about this stuff in school so I can't offer any good links...
EDIT: Once we know what are the important notes in a chord. I think all we need to do is to filter out the allowed extra notes from the input signal that enters the algorithm. Then it doesn't make a difference if you play all 6 strings or just the 3 important ones. It should still detect if you're playing something wrong.
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Inventor
Stream Operator
Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 270
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| Posted: Thu Jun 12, 2008 12:26 pm Post subject:
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Hi, Frostburn, I have just recently learned about notes and chords. I have no musical training. I looked up the frequencies of the MIDI notes for C, E, and G that you put in your software. I searched for them on my guitar frequency table that I just made for another reason. I cannot see any way that human fingers can make that chord on a guitar, they are spread out across five frets in the upper neck where the frets are large. But I'm no expert. Here's my table:
| Code: | Table of Guitar Fretboard Frequencies
6 5 4 3 2 1
1 82 110 147 196 247 330
2 87 117 156 208 262 349
3 93 123 165 220 277 370
4 98 131 175 233 294 392
5 104 139 185 247 311 349
6 110 147 196 262 330 370
7 117 156 208 277 349 392
8 123 165 220 294 370 415
9 131 175 233 311 392 440
10 139 185 247 330 349 466
11 147 196 262 349 370 494
12 156 208 277 370 392 523
13 165 220 294 392 415 554
14 175 233 311 349 440 587
15 185 247 330 370 466 622
16 196 262 349 392 494 659
17 208 277 370 415 523 698
18 220 294 392 440 554 740
19 233 311 349 466 587 784
20 247 330 370 494 622 830
21 262 349 392 523 659 880
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the frequencies you provided were 131, 165, and 196. These are on the chart but spaced really far apart! Also my table of chords, which lists over 50 chords does not have such a thing as near as I can tell. Maybe it's a chord that you can play on a piano but not on a guitar? I really don't know! Sorry for my ignorance, I'm just not musically trained.
Regarding most chords as having only three notes - well, for most of them you strum all six strings or at least five. The open strings get played too. Hmm maybe that can help us. Often it is three chords plus three open strings, which are always the same.
How about if we just did a random check? Let's say we only do a half a dozen combinations of all the possible combinations of strings, but those combinations are randomly chosen from all the possible ones? That might be OK.
I am really impressed with how well your code works for three strings, great job man!
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Inventor
Stream Operator
Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 270
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| Posted: Thu Jun 12, 2008 12:30 pm Post subject:
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| Frostburn wrote: | | EDIT: Once we know what are the important notes in a chord. I think all we need to do is to filter out the allowed extra notes from the input signal that enters the algorithm. Then it doesn't make a difference if you play all 6 strings or just the 3 important ones. It should still detect if you're playing something wrong. |
Oh, now I see your edit. Yep, sounds good to me!
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blue hell
Former site admin
Joined: Apr 03, 2004
Posts: 24864
Location: The Netherlands, Enschede
Audio files: 353
G2 patch files: 320
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Inventor
Stream Operator
Joined: Oct 13, 2007
Posts: 6221
Location: near Austin, Tx, USA
Audio files: 270
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| Posted: Thu Jun 12, 2008 6:02 pm Post subject:
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| Blue Hell wrote: | You're being lazy and should be able to that  |
OOPS!  I am so embarrassed  I blame it on the caffeine! The program works great as is out-of-the-box!
_________________
"Let's make noise for peace." - Kijjaz |
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blue hell
Former site admin
Joined: Apr 03, 2004
Posts: 24864
Location: The Netherlands, Enschede
Audio files: 353
G2 patch files: 320
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| Posted: Thu Jun 12, 2008 6:06 pm Post subject:
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| Inventor wrote: | | I blame it on the caffeine! |
Over alertness can do nasty things to me as well |
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