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?
http://www.prc68.com/I/pdf/Crystal_Freq.pdf
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:
12.288
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.
6,144 MHZ
24,576 MHz
is related multiples for 48 kHz and 192 kHz.
19.44
SDH/SONET STM-1 byte-rate
270*9*8 kHz = 19,44 MHz
51,84 MHz
155,52 MHz
311,04 MHz
622,08 MHz
are related multiples that occurs regularly
Cheers,
Magnus
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