Calc. ADPCM play time

[Mark Harris]

I want to convert an MP3 file to 4 bit ADPCM and store on a memory
card. How do I calculate the play time in minutes per MB? Sample rate
is 32KHz. Please show by example, if possible.

Many thanks,

Mark Harris

 

[Miguel Giménez]

El 22/04/2010 15:07, Mark Harris escribió:

I want to convert an MP3 file to 4 bit ADPCM and store on a memory
card. How do I calculate the play time in minutes per MB? Sample rate
is 32KHz. Please show by example, if possible.

bit sample sec 1 MB MB
4 ------ * 32000 ------ * 60 --- * ------- --- = 0.915 ---
sample sec min 8388608 bit min

or 1.09 min/MB