thanks for the ideas. i will try out the first three today. later when i install linux, i will look at the LADSPA plugins.

-p

On Saturday, April 9, 2005, at 02:46 AM, ClaudiusMaximus wrote:

Paris Treantafeles wrote:

...

i see that PD has cosine and sawtooth objects. is there a square wave object? or do you use tables to create them?

Some methods:

1: You can create a rectangular wave by subtracting two sawtooth waves that have different phases, vary the phase difference to change the proportion of high and low in the wave, at a particular phase you have a square wave.

2: You can [clip~] a cosine wave, various amounts of pre-clip amplification change the "hardness" of the square wave. The Zexy library also has [>~].

3. You can use tables with [tabread~] or [tabread4~] (there is also a

table osc but I've forgotten its exact name).

Note:

phasor~ is not band-limited, which means aliasing distortion can be audible, if you're using it as an audio oscillators. I think there are band-limited oscillator LADSPA plugins if you use Linux.

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Hi Derek,

Thanks for the leads. I'm mostly using mac os x but have recently obtained a used dell laptop and am planning to put a linux distro on it so i'll keep in mind the LADSPA plugins as well.

Best, p

On Saturday, April 9, 2005, at 06:57 AM, derek holzer wrote:

Hi Paris,

Paris Treantafeles wrote:

...

i see that PD has cosine and sawtooth objects. is there a square wave object? or do you use tables to create them?

If you search the archive, you'll find two very mathematical threads on this under the headers "square wave osc & pwm" and "band limited square wave". The trouble with many of the mathmatical methods of doing this in PD is that it is not anti-aliased, so you will get some aliased frequencies which would not be present in a true square wave.

If you are on Linux, I would recommend using the [plugin~] object with the BLOP LADSPA plugins. They have a beautiful "analog" sound, can be pulse-width-modulated, and best of all are bandwidth-limited to get rid of the nasty little "birdies".

good luck, d.

-- derek holzer ::: http://www.umatic.nl ---Oblique Strategy # 96: "Is the intonation correct?"

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