[time-nuts] Why these Crystal Frequencies?
magnus at rubidium.dyndns.org
Thu Dec 15 13:32:52 EST 2011
On 12/15/2011 04:13 AM, Brooke Clarke wrote:
> Hi Pete:
> Maybe you can shed some light on the common xtal frequencies table where
> there's no explanation given?
> An answer is not it's an "even" frequency or "it's an even binary
> frequency. That's true for most of these and the factors are part of the
> table above.
> The question is why do they exist?
> such as:
AES/EBU and S/P-DIF baud-rate for 96 kHz sampling-rate
128 x 96 kHz = 12,288 MHz
Also in wide use for audio-boards.
is related multiples for 48 kHz and 192 kHz.
SDH/SONET STM-1 byte-rate
270*9*8 kHz = 19,44 MHz
are related multiples that occurs regularly
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