audioaiff

How do you calculate bitrate for a non compressed audio file

For an uncompressed file I thought it was

SampleRate / (NoOfBits * NoOfChannels) = BitRate

which would give

44100 Hz / (16 bits * 2) = **1378 kbps **

However this bitrate calculator returns 1411.20 and when I look at the properties of an actual AIFF file in iTunes it also returns 1411 kbps.

So I assume my thinking is incorrect, what have I missed

Solution

  • Your formula is incorrect - it's just a coincidence that you're getting something close to the right answer (albeit with a handy change of units!).

    For uncompressed audio it would be:

    bit rate = sample rate * channels * bits per sample

    which for CD audio would be:

    = 44100 * 2 * 16
= 1411200 bits/s
= 1411.2 kbits/s

    See this relevant question for further details.