Florent Ghys

I need to convert transposition frequency ratios (1: no trans, 2: up 1 oct, 0.5: down 1 oct) to transposition in cents (0: no trans, 1200: up one octave, -1200: down 1 oct).

What is the math to do something like this? 

What I am looking for is the exact opposite of the transratio patcher. 

Hello, 
I need to convert transposition frequency ratios (1: no trans, 2: up 1 oct, 0.5: down 1  oct) to transposition in cents (0: no trans, 1200: up one octave, -1200:  down 1 oct).
What is the math to do something like this? 
What I am looking for is the exact opposite of the transratio patcher. 
thanks
Florent


Hello, 
I need to convert transposition frequency ratios (1: no trans, 2: up 1 oct, 0.5: down 1  oct) to transposition in cents (0: no trans

opposite of transratio?