On Mar 31, 2009, at 4:34 AM, Frank Barknecht wrote:
Hallo,
Alexandre Porres hat gesagt: // Alexandre Porres wrote:
you know, yeah, but the thing is that phasor is not actually an
oscilator at
all !!!
the name actually refers to phase, and not sawtooth.
And a [triangle~] may be used as a ping-pong looping [phasor~].
The objects Pd provides are building blocks - they generally are
designed on a
level that allows and encourages multiple uses. A square wave going
from 0 to 1
can be used as a logical signal that switches another signal on and
off. In
fact, a trivial square or saw without bandlimit should generally not
be used as
an "oscillator" in the analog synth sense - it should be bandlimited
first, and
while you do that you may as well make them have a DC of 0.
(Bandlimiting
triangle waves is not *that* urgent, as corners don't add so many
alias
components.)
I think the key to this discussion of -1 to 1 vs 0 to 1 is what people
are most likely going to use them for, and what makes the most sense
in that context. Of course, ideally, it wouldn't create arbitrary
restrictions either. For example, Cyrille and I make basically
everything 0 to 1 in the mapping library since it makes things really
easy to do without sacrificing much flexibility. If you start with,
or end up with different ranges, you can do the scaling math at the
input or output ends of the patch, and keep everything in between 0 to
1.
I think the two ranges for this discussion separate signals versus
controls. A sawtooth~ is a signal that is meant to be listened to, so
it would good from -1 to 1. A phasor~ is the exact same shape as a
sawtooth~, but it is meant to be a control, so it is 0 to 1. You
could easily switch the two with some basic math, but most of the
time, you'll want your controls to be 0 to 1 and your signals -1 to
1. A similar pair would be square~ (signal) and pwm~ (control).
.hc
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