[LAU] 1980's cds: analog to digital conversion

[fons at kokkinizita.net]

On Sat, Feb 13, 2010 at 11:28:33PM +0000, Folderol wrote:

> Does anyone know where they got that figure of 2122Hz from? It's always
> puzzled me. Is there some arcane mathematical significance, or was it
> the work of an engineer with an hangover?

It corresponds to a time constant (RC product)
of 75 microseconds. Now try to find standard
components to make that :-)

The other two are 'round' figures when expressed
as frequency. Corresponding RC values are 318 and
3180 usecs...

Ciao,

-- 
FA

O tu, che porte, correndo si ?
E guerra e morte !