On Wednesday, March 10, 2010 8:44 AM, Jim Sam wrote:
> On Tue, Mar 9, 2010 at 6:42 PM, Eric Jacobs wrote:
>> Transfering FLAT will cost you about 6-7 bits of dynamic
>> range - an audible loss.
> 36-42 dB*? ~10-12 is more like it, which is two bits max.
> That leaves 22 bits, which is more than adequate.
Just a thumbnail calculation on word length loss for two common EQs:
RIAA boost = 19.27 dB @ 20 Hz
RIAA cut = 19.62 dB @ 20,000 Hz
RIAA dynamic range lost = 38.89 dB
RIAA approximate word length loss with FLAT EQ transfer = 6.5 bits
NAB boost = 19.85 dB @ 20 Hz
NAB cut = 21.52 dB @ 20,000 Hz
NAB dynamic range lost = 41.37 dB
NAB approximate word length loss with FLAT EQ transfer = 6.8 bits
To the extent that fractional bits exist. <smile>
Keep in mind that this is word length loss due to a FLAT transfer,
where the bass boost is lost, and extra headroom is needed to
accomodate the lack of treble cut.
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