So from what I know bitrate is the product of samplerate * bitdepth.
But I cant understand this:
here for example we try to create an MP3 file selecting bitrate to 320 and sample rate to 44.1khz
How can that be? I mean if the formula bitrate = samplerate * bitdepth stands true then it must be that bitdepth = bitrate/samplerate and in our case bitdepth = (320*1024)/44100 = ~7
Will it really have such a low bitdepth? if not then why not?
Also if the above is true would it be not wiser to sacrifice some samplerate in order to gain some bitdepth?
Last but not least lets assume a 128kbps MP3 track with 8bit as bitdepth the sample rate (according to the above equation) sould be 16384.
But the sound band of the music played will vary from 20 to ~20000hz how is this possible? I would assume that since 16384 samples per second are "spited" out from a soundcard playing that 128kbps file then the frequencies involved can not be higher than 16384hz
EDIT: In case my post is confusing: how the sampling rate of a file is factored into the output MP3 bitrate ?