[music-dsp] ring modulation

philippe kelvin.bitnick at gmail.com
Wed Oct 20 20:11:08 EDT 2010


the elektor electronic magazine (here in europe) published two such
circuits in the last 10 or 15 years.
the strange network is an all-pass 90° shifter, an analogue hilbert transformer.

handy for PA usage to circumvent larsen.

On Wed, Oct 20, 2010 at 8:40 PM, James Chandler Jr
<jchandjr at bellsouth.net> wrote:
> On Oct 19, 2010, at 3:09 AM, Andrew Capon wrote:
>
>> Analog synth circuits are still fun : http://www.musicfromouterspace.com/
>>
>> Andy
>
> Thanks for the link, Andy. That is a neat site! Lots of great info.
>
> On Oct 19, 2010, at 4:28 PM, Nigel Redmon wrote:
>
>> Are you sure Stockhausen wasn't using a frequency shifter, and not a ring modulator? Just wondering--I don't know.
>>
>> We had a 360 Systems Frequency Shifter (a green one) in the electronic music lab at USC back in the 70's. I had a ring modulator on my home-built modular (mostly based on Aries modules) back then (well, still have it, but long time since power-up). Quite a different sound. A frequency shifter suppresses one sideband, so that all harmonics are shifted one way by a fixed amount (hence the harmonics will diverge).
>>
>> I just did a search and found a a forum post at gearslutz discussing frequency shifters, and the poster said, "Small shifts gave deep phasing effects, larger shifts were -interesting, if not over musically useful (frequency differences which were related to a note gave strange harmonic structures, when the note changes, purest dissonance- very Stockhausen)".
>
> I found a fellow's home-made frequency shifter schematics.
>
> http://homepage.ntlworld.com/henry01/frequency_shifter/frequency_shifter.htm
>
> His analog quadrature phase shifter circuit is interesting--
>
> http://homepage.ntlworld.com/henry01/frequency_shifter/freq_shifter03-01.pdf
>
> His filter network reminds me of this cartoon--
>
> http://imgs.xkcd.com/comics/nerd_sniping.png
> --
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