Owner`s manual

CHAPTER 4 -

Modular Components of the TimewARP 2600

4.8

Envelope Follower

The

Envelope Follower

generates, from any audio-frequency input, a  uctuating DC output

Envelope Follower generates, from any audio-frequency input, a  uctuating DC output Envelope Follower

level directly proportional to the average moment-by-moment input signal amplitude. Its

sensitivity is such that, with the input attenuator wide open, a 1V P-P square wave will

produce a +10vV output. The maximum output is +10vV.

The risetime, or time it takes for the

Envelope Follower

to respond to any sudden change

Envelope Follower to respond to any sudden change Envelope Follower

in the amplitude of the signal input, is 10 milliseconds to 50% of  nal value and 30

milliseconds to 90% of  nal value.

Like all similar circuitry, the

Envelope Follower

tends to “ride” on low audio frequencies

Envelope Follower tends to “ride” on low audio frequencies Envelope Follower

as if they themselves represented changes in signal amplitude; this is not critical, but

has been held to a ripple of less than 1% P-P down to l00Hz and less than 10% down to

40Hz.

The primary use of the

Envelope Follower

is with external instruments. Essentially it extracts,

Envelope Follower is with external instruments. Essentially it extracts, Envelope Follower

from any audio input, a control signal representing the amplitude-envelope of that input:

this signal may control the

VCF, VCA,

or any of the

VCO’s.

The

Envelope Follower

output is an

Envelope Follower output is an Envelope Follower

envelope and can be used in the same fashion as the output from either of the envelope

generators.

The default input to the

Envelope Follower

is from the preampli er. When the TimewARP

Envelope Follower is from the preampli er. When the TimewARP Envelope Follower

2600 is con gured for stereo input, it is the  rst (left) channel preampli er output.