Re: What's all this Magic Sinewave stuff anyway?
- From: boB <boB@>
- Date: 31 May 2007 18:21:12 -0500
On Wed, 30 May 2007 06:49:05 GMT, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:
Dan Bloomquist wrote:
boB wrote:
Don Lancaster wrote:
Don Lancaster wrote:
boB wrote:
Then there'es the problem of voltage regulation. By changing the
magic sinwave table to regulate, if that even works, the distortion
would get worse at certain regulation points than that best sequence
with low THD.
Do you mean active interpolation ?? ... like with maybe a linear
amplifier to fill in for the quantization noise ?
No, it is as simple as a class D driven by simple algorithms.
Presumably with a sinewave algorithm.
What he means here is an algorithm that makes the non-ideal waveform a
sinewave by filling in to make it a sine wave.
Yeah, a class D amp instead of a linear amp would be better,
especially if it was a larger amount of power needed.
If you only needed a few watts worth, a linear version might be OK.
I fail to see where the magic is.
Well.... It's certainly a different idea or philosophy, but not
really "magic". And the idea was published decades ago to create
tables of waveforms that just cancel out the first few main harmonics
(or more of course). The problem as I see it is that if you're going
to go for way more harmonic reduction, you've got to have a faster
change of pulses which eventually begin to be a high frequency.
At some point you might as well just use PWM I suppose. That is, if
you would like the waveform to LOOK like a sinewave on a scope)
boB
Graham.
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