Am 23.09.2013 15:47, schrieb syndromeda@... :

> Can someone tell me if there is a difference between a frequency shifter
> (A-126) and a pitch shifter as in the VCDSP A-187-1

The pitch shifter keeps the musical context. The frequency shofter doesn't.

More technically spoken:
The pitch shifter multiplies frequencies with a factor. The frequency
shifter adds frequencies.



I think simple number examples, show it the best:


A frequency shifter shifts all frequencies for a certain number amount
of Herz. Lets say 2Hz

Take a very low bassnote like a 'C. It has 32 Hz. If you shift that for
2Hz, then it will be a little above a 'C#.

Now take a quite high note like a c'''. It hast 1000Hz. If you shift
that you even won't notice.




Now a pitch shifter shifts not frequency but pitch (like "a half note").
The same example:

Take a very low bassnote like a 'C (32,70 Hz). Shift it for a half note,
it will become a 'C# (34,65 Hz)

Now take the quite high note like c''' (1.046,50 Hz). Shift it for a
half note. it will become a d#''' (1.108,73 Hz).