miroslav
Cosmic Cowboy
Trying to get my head around something, but I'm just not seeing the math (though I'm sure it's a simple answer).
OK...so I have my MX-80 running at 15ips.
I want to simply slow down or speed up the IPS so that I can pitch-shift by a semi-tone.
Now....I've found some charts for this, but for some reason, if I go down, the percentage is -5.61%, but if I speed up a semi-tone, it would be +5.95%....according to the charts...???
I'm not seeing the reason in the slight difference between up/down.
Now, lets say you want to go further up or down...2-3 semi-tones....it's even more strange. There is no predictability in the percentage numbers.
Look at these charts....can anyone see why this is the case?
Semi-Tone Pitch/IPS/Percentage Relationship Chart 1
Semi-Tone Pitch/IPS/Percentage Relationship Chart 2
Just look at the percent column and the numbers at the 0.0, 1.0, 2.0 or 0.0. -1.0, -2.0....etc...etc.
If the steps between semi-tones are the same...why wouldn't the IPS percentage change be the same interval...??? Like 2x, 3x, etc.....and why the percentage differences when going up/down a semi-tone. I would think that at least there it would just be a + or -...but the percentage would be the same...???
The Otari decks have a percentage readout, so these charts are great, I can just set the Vari-speed with the correct percentage, depending how far I want to go up/down...but I just don't get why the difference.
Not to mention...the pecentage step between say C and C# (5.95%) is not the same as it is between D and D# (6.67%).......????????
To me...it's all one semi-tone, regardless of the note...so wouldn't the percentage steps be identical between any two semi-tones...?
I feel like there's a valid reason for the small differences....I just can't put my finger on why it's valid.
I'll have to think about it a bit...it will probbaly hit me when I wake up tomorrow...or when I'm in the shower.
OK...so I have my MX-80 running at 15ips.
I want to simply slow down or speed up the IPS so that I can pitch-shift by a semi-tone.
Now....I've found some charts for this, but for some reason, if I go down, the percentage is -5.61%, but if I speed up a semi-tone, it would be +5.95%....according to the charts...???
I'm not seeing the reason in the slight difference between up/down.
Now, lets say you want to go further up or down...2-3 semi-tones....it's even more strange. There is no predictability in the percentage numbers.
Look at these charts....can anyone see why this is the case?
Semi-Tone Pitch/IPS/Percentage Relationship Chart 1
Semi-Tone Pitch/IPS/Percentage Relationship Chart 2
Just look at the percent column and the numbers at the 0.0, 1.0, 2.0 or 0.0. -1.0, -2.0....etc...etc.
If the steps between semi-tones are the same...why wouldn't the IPS percentage change be the same interval...??? Like 2x, 3x, etc.....and why the percentage differences when going up/down a semi-tone. I would think that at least there it would just be a + or -...but the percentage would be the same...???
The Otari decks have a percentage readout, so these charts are great, I can just set the Vari-speed with the correct percentage, depending how far I want to go up/down...but I just don't get why the difference.
Not to mention...the pecentage step between say C and C# (5.95%) is not the same as it is between D and D# (6.67%).......????????
To me...it's all one semi-tone, regardless of the note...so wouldn't the percentage steps be identical between any two semi-tones...?
I feel like there's a valid reason for the small differences....I just can't put my finger on why it's valid.
I'll have to think about it a bit...it will probbaly hit me when I wake up tomorrow...or when I'm in the shower.