[sdiy] Through-zero FM - how much?

Mattias Rickardsson mr at analogue.org
Thu Oct 18 18:07:39 CEST 2018


On Thu, 18 Oct 2018 at 17:27, Mattias Rickardsson <mr at analogue.org> wrote:

> On Thu, 18 Oct 2018 at 16:28, Ian Fritz <ijfritz at comcast.net> wrote:
>
>> Mattias —
>>
>> I believe you are refering to the modulation index m ranging up to 8 or
>> 10?  This is not what the OP asked. The modulation index is the change in
>> carrier frequency divided by the modulation frequency.
>>
>
> Hi Ian,
>
> no, I'm referring to the modulation depth as Matthew asked for it - 8 to
> 10 times the carrier frequency. I remember counting folding sinewaves in a
> DX7-style synthesis and ending up with something like that.
>
> But also, I might be wrong. ;-)
>

Oh, I'm actually a bit wrong: I was referring to the fact that the phase
was shifted 8 or 10 turns away. Depending on how fast this is done, the
frequency deviation (modulation) could be just about anything. My bad! :-)

/mr
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