Alesis micron Reference Manual

 

 
40-band vocoder 

A vocoder uses two sets of band-pass filters (filter banks) to 
impart the characteristics of one sound source onto another.  The 
analysis filter bank determines the level of the input at several 
different frequencies.  These levels are used to modulate the 
output levels of the corresponding frequencies of the synthesis 
filter bank.  The most common use of this is to send a synthesizer 
signal into the synthesis input and a voice (recorded or live via a 
microphone) into the analysis input to get a “talking synthesizer” 
effect.     
 

A.  Analysis Gain   

Also sometimes referred to as “Analysis Sensitivity,” 
this adjusts the gain of the input to the analysis filter 
bank.   
Range: 

B.  Sibilance Boost  

This adjusts the level of a high-pass shelving filter at 
the input to the analysis filter bank.  This will 
increase or decrease the sibilant frequencies 
(consonant sounds) to improve intelligibility or 
change the tonality of the vocoder. 
Range: 

This adjusts how quickly the synthesis filters will 
react to the input signal.  A faster response (lower 
setting) will usually be more intelligible, but slower 
decay times (higher setting) can be more musical. 
Range: 

This shifts the frequencies of the Synthesis filter 
bank, relative to the analysis filters.  The result is a 
pseudo pitch-shift effect.   
Range: 

E.  Synthesis Input   

This selects which signal is sent to the synthesis 
filter bank.  
Range: