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AW4416 headroom/gains tructure issue

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AW4416 headroom/gains tructure issue

Postby intermittent hummer » Wed May 01, 2013 10:44 am

Hi,
Can anyone help with details about the headroom considerations on AW4416.
from my memory its a 32 bit fixed point arrangement, but I can't find the bit of the manual I originally found that in. The reason I'm asking is I have just recorded 2 songs where almost every channel is clipping (showing red) and the stereo track is clipping (showing red) with the fader at 0dB full scale on the stereo track, yet there is no distortion audible.
anyone got full technical knowledge of this issue?
thanks
jp
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Re: AW4416 headroom/gains tructure issue

Postby James Perrett » Wed May 01, 2013 11:53 am

I don't know for sure but usually fixed point systems are designed with a bit of headroom so a 32 bit system may use 28 bits as the equivalent of 0dBFS leaving 4 bits worth of headroom.
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Re: AW4416 headroom/gains tructure issue

Postby intermittent hummer » Wed May 01, 2013 4:45 pm

thanks
how much is 4 bits worth of headroom in dB terms?

jp
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Re: AW4416 headroom/gains tructure issue

Postby Hugh Robjohns » Wed May 01, 2013 4:54 pm

Each additional bit doubles the number of quantising levels, and thus improves the signal-to-noise ratio by 6dB. So one bit is the equivalent of 6dB more headroom or a 6dB lower noise floor.
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