[sdiy] Prom generating TOS like MK50240 bits..

[Tom Wiltshire]

I agree with everyone else. It's a very long sequence. The ratios and their factors look something like this:

High C	÷239	None
B		÷253	11,23
A#		÷268	2,4,67
A		÷284	2,4,71
G#		÷301	7,43
G		÷319	11,29
F#		÷338	2,13,26
F		÷358	2
E		÷379	None
D#		÷402	2,3,6,67,134
D		÷426	2,3,6,71,142
C#		÷451	11,41
Low C	÷478	2


As you can see, there's precious little in the way of common factors. You can take a factor of 2 out of some sequences, or a factor of four or 6 out of a couple of others, but there's nothing that they all share that's going to radically change the nature of the problem.

Given that, get the length of the sequence by multiplying those ratios:

239
60467
16205156
4602264304
1385281555504
441904816205776
149363827877552288
5.3472250380164E+19
2.0265982894082E+22
8.146925123421E+24
3.4705901025773E+27
1.5652361362624E+30
7.4818287313342E+32

I tried to find out how many terabytes that is, but it's way bigger even than yottabytes! (10^24).

Not a practical approach, in short!

Tom


On 18 Apr 2012, at 20:53, Harry Bissell wrote:

> It seems you would need a very long sequence to get those all to line up...
> 
> It would be the least common multiple of all the divisor ratios... (???)
> 
> (and would you want it to repeat like that. Phase locking of all the tones is the biggest
> complaint against TOG anyway...
> 
> H^) harry
> 
> ----- Original Message -----
> From: Jean-Pierre Desrochers <jpdesroc at oricom.ca>
> To: synth-diy at dropmix.xs4all.nl
> Sent: Wed, 18 Apr 2012 15:45:54 -0400 (EDT)
> Subject: [sdiy] Prom generating TOS like MK50240 bits..
> 
> 
> Suppose you read all the 12 generated notes from
> a MK50240 TOS with a signal analizer, after a while is there a
> 'sequence' in the 12 generated square waves that 'wraps around' ?
> I mean all the tones repeat all together a pattern
> that could be burned into a  PROM then scanned with
> a binary counter that would wrap at a precise address
> to make all the tones seam running continuously.. ?
> JP
> 
> 
> 
> 
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> -- 
> Harry Bissell & Nora Abdullah 4eva
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