SynthMaker

Frequency Modulation

Archive · 2007 6 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

chironex ·

Hey everybody.

Can anyone help me find a way to alter the frequency of a stream? Is there a module that'll do this?

If so, thanks you.

chironex ·

Any takers?

b_ara_ki ·

you can do it with a delay & modulate it with an lfo it change the pitch of the signal like fm

chironex ·

I'm not exactly sure I know what you mean. Do you think you could show me? Or point me to a Freq Changer module?

chironex ·

Hello? Anybody home?

oddson ·

Your question seems to be about modulating the frequency value.

Here's a set-up that's essentially a vibrato that is tied to the frequency of the carrier wave. It's very much like the arrangement that led to the discovery of FM synthesis in the 1960s.

FM.osm

The frequency stream coming from the MIDI2Poly component and connected to the carrier wave OSC is modulated around unity by the modulation source OSC.

The red ellipse shows the frequency being multiplied by 1 plus the modulation amplitude.

Usually, Phase Modulation is used instead - even though it's usually still referred to as FM. To do this the modulation source is hooked to the Phase input of the main OSC.

The two methods are very similar in their output (equivalent apparently under the right circumstances).

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