Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO)

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To: David Robillard <d@...>
Cc: <linux-audio-dev@...>
Date: Tuesday, August 21, 2012 - 11:02 pm

On Tue, Aug 21, 2012 at 06:29:22PM -0400, David Robillard wrote:

> What is this signal? It either means some absolute frequency, or it is

It doesn't have to be true... you can always see the
absolute part as a property of whatever receives the
signal.

Suppose you have a VCO with two 1/octave control ports.
One is used by a GUI element, say a slider which could
have a scale in Hz, note names, or octaves. The second
is the 'voltage' from a keyboard.

The actual frequency of the VCO would be

F = exp2(V1 + V2 + C) (1)

where C is some constant, e.g. log2(440).

Each of these two ports can be used without the other,
that depends just one what you are doing. In case you
use only V1, you could say that C is a property of the
port that delivers V1. Same for V2.

But if you use both, which one, keyboard or calibrated
slider, is the absolute one and which one is the offset ?
That, I'd say, is just 'in the eyes of the beholder'.

That's why I'd say that both are offsets, and C is a
property of the VCO.

Ask yourself this: in what way would (1) be different
if you'd consider either port to be 'absolute' ?

Even if you'd move C 'into a port', the net result
would still be the same sum, in which all terms have
equal status.

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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Messages in current thread:
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Jeff McClintock, (Mon Aug 20, 11:02 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Tue Aug 21, 12:50 am)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Nick Copeland, (Tue Aug 21, 8:14 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Fons Adriaensen, (Tue Aug 21, 9:54 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Tue Aug 21, 10:29 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Fons Adriaensen, (Tue Aug 21, 11:02 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Tue Aug 21, 11:50 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Thorsten Wilms, (Wed Aug 22, 8:30 am)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Wed Aug 22, 4:43 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Fons Adriaensen, (Wed Aug 22, 9:12 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Wed Aug 22, 9:32 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Fons Adriaensen, (Thu Aug 23, 10:56 am)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Thu Aug 23, 4:06 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Fons Adriaensen, (Thu Aug 23, 4:35 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Thu Aug 23, 5:07 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Wed Aug 22, 5:37 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Nick Copeland, (Wed Aug 22, 1:24 am)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Wed Aug 22, 1:57 am)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Tue Aug 21, 8:59 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Nick Copeland, (Tue Aug 21, 10:11 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), Jens M Andreasen, (Wed Aug 22, 3:50 pm)
Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO), David Robillard, (Tue Aug 21, 10:52 pm)