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let´s say i have a base 10 dB and then i increment this value to 16 dB, there are 6 dB of diference so my volume has changed, but now let´s say i want to increment the same amout of volume to a different value of base dB, for instance i have 50 dB now and i want to add the same amount of volume that i added before, well certanly it isn´t 56dB what i will end up with, i know it's a logarithmic equation. My question is if there is a formula to find out how much volume i have to increment any time based on a previous amount of volume change?

notes: 1)my volume control goes from 0 to 1 2)i don't just increment te volume and forget the rest because i need to make the sound change it's volume dynamically while it is being played

alexm
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Sound like you're looking for 'Percent Change'.

((y2 - y1) / y1) = percentage change

((16-10)/10) = 0.6

http://www.percent-change.com/index.php?y1=10&y2=16

A Start: 10dB

A Finish: 16dB

A Delta: 6dB

A Percent Change = 0.6

B Start: 50dB

B Finish: (((A Finish - A Start) / A Start) * B Start) + B Start

(((16-10)/10)*50)+50 = 80

In your example the 50dB should be increased to 80dB.

s15199d
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  • You could also calculate it it this way: B Finish = ((B Start / A Start) * (A Finish - A Start)) + B Start – s15199d Mar 27 '13 at 15:21
  • you are right! it solved my problem i had to forget about the logarithmic equation since dBs are allready using it. thank you – alexm Mar 28 '13 at 22:11