So, the calculations in the cited spreadsheet are based on a 8KB/sec (64kbps) stream, which would be the standard G.711 codec that is used as the basis for almost all voice transmissions. This is the "gold standard", and would have no degradation what-so-ever.
But, if you're willing to take a little hit, you could use G.726 at a 32kbps (4KB/sec) rate, which to the human ear isn't going to sound noticeably worse. It's also what's used in the DECT cordless handsets. That would cut your storage costs in half. Studies show this is approximately 97% of the quality of a G.711 codec.
Let's take it one step further, and move to G.729, which is common in VoIP, and is actually what most conference call systems use. This operates at 8kbps (1KB/sec), and now we have an 8x reduction in space. This would reduce the estimated data storage requirements (as documented in the spreadsheet) from 272PB/year to 34PB and the cost to $3.4M.
So, tell me dear friends, what do YOU think?
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