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Signals to controls

Example (not pictured) demonstrates conversion from audio signals back to numeric control streams, via a new tilde object introduced here.

\fbox{ $\mathrm{snapshot}\sim$}: convert audio signal to control messages. This always gives the most recently computed audio sample (fast-as-possible conversion), so the exact sampling time varies by up to one audio block.

It is frequently desirable to sense the audio signal's amplitude rather than peek at a single sample; Example C07.envelope.follower.pd (also not pictured) introduces another object which does this:

\fbox{ $\mathrm{env}\sim$}: RMS envelope follower. Outputs control messages giving the short-term RMS amplitude (in decibels) of the incoming audio signal. A creation argument allows you to select the number of samples used in the RMS computation; smaller numbers give faster (and possibly less stable) output.

Miller Puckette 2006-12-30