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RE: Theremin sound
by Martin Peach
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I just looked at the output of a PAIA Theremax on a scope. It looks just
like a sine wave except at really low frequencies where the positive peaks
are gently flattened (which might be caused by the electrolytic capacitor on
the output being too small). This theremin uses four coils. It also has a
tone control which mixes a squarish wave with the sine wave to get a more
triangular output.
Martin
Pedro Ferreira wrote:
>OK... we currently have three theories:
>- half-sine
>- sinusoidal through waveshaping distortion
>- filtered sawtooth
>
>(perhaps the last two ones are compatible?)
>
>But I heard that Rockmore's sound is slightly different from the
>"classic" theremin.
>
>Any ideas?
>
>Pedro
>
>On Jan 16, 2008 4:03 PM, Richard Dobson <richarddobson@...>
>wrote:
> > Pedro Ferreira wrote:
> > > Hello.
> > > Yes, I've read that it's achieved through heterodyning. But in this
> > > case we're left again with a sinusoidal (which goes against Joseph's
> > > mail). I guess the secret is the kind of filtering that the signal
> > > suffers. What kind of distortion are you talking about?
> > >
> >
> > Looking at the first track on the OHM disk set, (Clara Rockmore, "Valse
> > Sentimentale" - and played ~extremely~ sentimetally!) it is a filtered
> > sawtooth (very few harmonics). Difficult to be more precise with all
> > that vibrato.
> >
> > Richard Dobson
> >
> >
> >
> >
> > Send bugs reports to this list.
> > To unsubscribe, send email sympa@... with body "unsubscribe
>csound"
> >
>
>
>Send bugs reports to this list.
>To unsubscribe, send email sympa@... with body "unsubscribe
>csound"
Send bugs reports to this list.
To unsubscribe, send email sympa@... with body "unsubscribe csound"
like a sine wave except at really low frequencies where the positive peaks
are gently flattened (which might be caused by the electrolytic capacitor on
the output being too small). This theremin uses four coils. It also has a
tone control which mixes a squarish wave with the sine wave to get a more
triangular output.
Martin
Pedro Ferreira wrote:
>OK... we currently have three theories:
>- half-sine
>- sinusoidal through waveshaping distortion
>- filtered sawtooth
>
>(perhaps the last two ones are compatible?)
>
>But I heard that Rockmore's sound is slightly different from the
>"classic" theremin.
>
>Any ideas?
>
>Pedro
>
>On Jan 16, 2008 4:03 PM, Richard Dobson <richarddobson@...>
>wrote:
> > Pedro Ferreira wrote:
> > > Hello.
> > > Yes, I've read that it's achieved through heterodyning. But in this
> > > case we're left again with a sinusoidal (which goes against Joseph's
> > > mail). I guess the secret is the kind of filtering that the signal
> > > suffers. What kind of distortion are you talking about?
> > >
> >
> > Looking at the first track on the OHM disk set, (Clara Rockmore, "Valse
> > Sentimentale" - and played ~extremely~ sentimetally!) it is a filtered
> > sawtooth (very few harmonics). Difficult to be more precise with all
> > that vibrato.
> >
> > Richard Dobson
> >
> >
> >
> >
> > Send bugs reports to this list.
> > To unsubscribe, send email sympa@... with body "unsubscribe
>csound"
> >
>
>
>Send bugs reports to this list.
>To unsubscribe, send email sympa@... with body "unsubscribe
>csound"
Send bugs reports to this list.
To unsubscribe, send email sympa@... with body "unsubscribe csound"
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