Le 2012-02-15 à 12:07:00, Miller Puckette a écrit :
That's an open question; I'm not sure whether computing the length of a
blockin msec and then sending it to "delay", for instance, would always
round back to the exact number of Pd ticks in a block.
It depends on how you do it. See attached patch to see that [int] helps
find a lot of cases of (1/x)*x = 0.999999... But there are less than how I
think there would be.
If replacing truncation by actual rounding, then the problem disappears.
C's (int) and C++'s int() are the same as Pd's [int].
(A pd tick, internally, is small enough that one millisecond and one
sample both are integer numbers of ticks, at least provided the SR is
one of the "standard" ones.)
That's actually the ppcm of 192 and 88,2 kHz.
There would still be the problem of round-off errors for larger delays -
the only way I can see to manage that is to have the time objects have a
notion of unit.
Would a similar things happen to all objects that take frequencies ?
[osc~ 4 kHz] means 4000
[osc~ 1382.3 rad/s] means 220
[osc~ 36000 deg/s] means 100
[osc~ 2 ms] means 500
[osc~ 69 midi] means 440
[osc~ 180 bpm] means 3
and don't forget barks...
______________________________________________________________________
| Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC
#N canvas 823 402 450 300 10;
#X obj 86 155 /;
#X obj 86 176 *;
#X floatatom 86 217 5 0 0 0 - - -;
#X floatatom 167 99 5 0 0 0 - - -;
#X obj 86 197 i;
#X obj 167 118 t b f;
#X msg 86 135 1;
#X obj 86 256 f;
#X obj 86 276 print;
#X obj 167 59 metro 20;
#X obj 167 79 f;
#X obj 192 80 + 1;
#X obj 167 41 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X obj 86 236 sel;
#X connect 0 0 1 0;
#X connect 1 0 4 0;
#X connect 2 0 13 0;
#X connect 3 0 5 0;
#X connect 4 0 2 0;
#X connect 5 0 6 0;
#X connect 5 1 0 1;
#X connect 5 1 1 1;
#X connect 5 1 7 1;
#X connect 6 0 0 0;
#X connect 7 0 8 0;
#X connect 9 0 10 0;
#X connect 10 0 11 0;
#X connect 10 0 3 0;
#X connect 11 0 10 1;
#X connect 12 0 9 0;
#X connect 13 0 7 0;
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