[sdiy] Multiplexed Expo Converter?

[Scott Nordlund]

> 1. FM
> I thought 'linear' audio rate FM was supposed to be much better. What
> can you guys tell me about expo vs linear fm? I have seen some VCOs
> with 'linear fm in', I guess that just bypasses the EC?
>
> Or is 'linear' audio rate FM better for the specific reason that
> removing the EC makes the system simpler and hence easier to make very
> good?

Exponential FM is inharmonic, so it's generally less musically useful.

> 2. PM
> Correct me if I'm wrong, but I think PM again doesn't need an EC, does
> it? Even if it's DC modulation...

Analog phase modulation is used sometimes for radio signals, but I don't if or how it could be implemented for musical purposes (I can't think of any examples, phase shifters aside).

> 3. AM/RM
> I don't think AM needs EC.. at all... correct me if I'm wrong, please.

You could run the two input signals through exponential converters, sum them, then run that through a logarithm...



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