[sdiy] Dumb PWM question

[Scott Gravenhorst]

harrybissell at wowway.com wrote:
>iirc the original comment involved using the technique
>on arbitrary inputs (like maybe the radio ?).  In a
>monophonic configuration it would probably be OK but 
>with a poly input it would give mush, or worse than mush imho.
>
>Symmetrical clipping works OK... but this method would have
>the distortion located at the zero crossings... and that (from
>experience) does not sound good.
>
>imho of course...   ;^P

Ok, I'm confused.

I understand the arbitrary waveform modification thing, and a reference to a time
machine.  Are you saying that when applied to an arbitrary waveform it sounds like
crap (assuming you have a T.A.R.D.I.S.)?  Even if the waveform is not changing?

It also seems to me that the distortion is not just at zero crossing, dv/dt would
change for the entire waveform, so I'd think that the whole thing is distorted.

>H^) harry
>
>
>
>On Thu, 28 Feb 2008 06:40:48 -0700, Scott Gravenhorst wrote
>> >> Harry said:
>> >> 
>> >> > Still bet it sounds like s**t
>> 
>> Didn't someone mention the idea of a digital simulation using 
>> arithmetic methods to produce a sound file?
>> 
>> Was that done?
>> 
>> I would think that since while not animated, it is periodic (i.e., 
>> the pattern repeats ever cycle), it shouldn't sound like s**t. 
>>  Wouldn't periodicity give rise to a standard set of harmonics?
>> 
>> Why would it sound like s**t?
>> 
>> Even while animating the "PWM", I can't see why it would sound any 
>> worse than a PWM pulse wave.
>> 
>> -- ScottG
>> 
>> -----------------------------------------------------------------
>> 
>> -- Scott Gravenhorst
>> -- GateMan-III - FPGA Based Monophonic MIDI Synthesizer with SVF
>> -- PolyDaWG/8 - FPGA Based 8 Voice Polyphonic MIDI Synthesizer
>> -- phLUTe - FPGA Based Monophonic Physical Model MIDI Synthesizer
>> -- FatMan: home1.gte.net/res0658s/fatman/
>> -- NonFatMan: home1.gte.net/res0658s/electronics/
>> -- When the going gets tough, the tough use the command line.
>> 
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>
>
>Harry Bissell & Nora Abdullah 4eva
>

-- ScottG

-----------------------------------------------------------------

-- Scott Gravenhorst
-- GateMan-III - FPGA Based Monophonic MIDI Synthesizer with SVF
-- PolyDaWG/8 - FPGA Based 8 Voice Polyphonic MIDI Synthesizer
-- phLUTe - FPGA Based Monophonic Physical Model MIDI Synthesizer
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- When the going gets tough, the tough use the command line.