Author Topic: Automated Music Transcription System (my Honours project)  (Read 8153 times)

Offline uncloned

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« Reply #15 on: October 26, 2008, 15:48:36 »
here is what I was looking for....

Look at the chart about half-way down

http://en.wikipedia.org/wiki/Equal_temperament

"cents" is a logarithmic unit that is based on hearing

I think though your point is  3/2 = 1.500000 = the fifth - which is in just intonation exactly one half more in frequency.

so I guess it is how you count or perceive pitch.

Offline Sam_Zen

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« Reply #16 on: October 27, 2008, 01:35:19 »
Very informative page, thanks.

By the way, I don't think these harmonic rules stop at the tonal range, let's say 16 Hz.
Way below, the range of percussion beats and/or rhythmic patterns starts. The same formulas are valid there too.
If I sample (with the Casio SK-1) a hit on a drum, and put the sample in a loop, and play f.e. the lowest A key,
the drum is beating at a certain speed. If I play the octave, the beating speed is doubled.

So what if playing a 3-note chord including the quart or the quint inside that octave ?
I may be wrong, but one chord has a ratio of 2:3. The other one 3:4, so with a common 'one' every 12 beats.
I have a recording of the Casio while playing (quite sloppy) with this phenomenon.
A mix of the notes first played with the tonal 'brass' sound, and the same notes played with the looped drum-sample.
http://www.samshuijzen.nl/sam/reap/5_channel2.ogg

Sorry if I get OT.
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Offline uncloned

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« Reply #17 on: October 27, 2008, 03:14:13 »
The beat at the end is great!!!!

This is an interesting concept.

Usually people this of beats as steady and divided into powers of two.
(half, quarter, eighth)

I have a couple of those casio's too - though I wonder if there is another way to do this. I'd like to play with it too.

Do you have any more experiments like this?

(Barry - should we open a new thread?)

Offline Sam_Zen

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« Reply #18 on: October 27, 2008, 08:24:46 »
A new thread could be an option.
Yep, the piece at the end is the best example while playing chords.
I tried to make a more clean example of this, but my recording facilities refused to work at the moment.
But I don't think much more experiments are needed. The principle is clear.
The same is valid by the way if using a rhythmic pattern in OMPT as a sample.
If the pattern, so instrument, is set at a certain playback speed to take 32 steps for the correct loop.
setting the note an octave higher will double the playback of the pattern, so will take 16 steps in the pattern.
An example of this : http://www.samshuijzen.nl/sam/plainmods/deropp_3.mod
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Offline uncloned

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« Reply #19 on: October 29, 2008, 00:33:23 »
I will listen now

as an aside - you may enjoy this music made with pitch ratios

has an explanation etc.

http://mysterybear.net/article/30/unstill-light

Offline uncloned

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« Reply #20 on: October 29, 2008, 00:36:24 »
I rather like that module!

Though - in this example it is double-time

The example with the casios sounded really different.

Offline Sam_Zen

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« Reply #21 on: October 29, 2008, 02:45:14 »
Unstill Light is nice indeed.
The difference between the module pattern and the Casio example is not that much.
If the rhythmic pattern is seen as a 'bar' with a certain number of steps,
so the single Casio drum hit repeat can be placed in a 'bar' as well, with a certain number of hits.
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