what is the exact work that external wordclocks do?
are they really necessary?
in which cases mostly?
how does it work.
how the connections on the back of the stand alone wordclock are supposed to be connected?
i have an idea...., but i would like some analysis here.
thanks.
external stand alone wordclocks
they are not nessessary, but they do improve the sound. there are bnc outputs on the back which connect to every device that can be clocked by wordclock. with scope thast means you have to use the syncplate.
good clocks include the apogee big ben and the rosendahl nanoclocks.
there's not much more to it.....
good clocks include the apogee big ben and the rosendahl nanoclocks.
there's not much more to it.....
Both AD and DA converters need a constant pulse for doing the 'measurement' of the input signal level, and also for reproducing the sampled values.On 2006-01-10 12:59, ARCADIOS wrote:
what is the exact work that external wordclocks do?
A 'regular' crystal clock circuit isn't stable enough if high quality is demanded, mostly due to temperature drift that changes the electrical specs of the circuit.
for simplicity imagine a perfect sine wave that's scanned at infinetely precise intervals.are they really necessary? in which cases mostly? how does it work.
Each point of the curve corresponds precisely to it's position regarding level and time.
If the clock pulse drifts (unavoidable in real life, an effect called jitter) the 'perfect' position is missed.
The wave literally gets a small bumb, which is perceived as distortion. A waveshaping oscillator does this intentionally - the effect is quite impressive.
To reproduce the theortical resolution of a 20 bit value (or 24, sorry I don't remember) the clock deviation has to be less than 6 pico seconds, the 300th part of a nanosecond... no kidding
Anyway that's theory, but it nevertheless shows the dimension of precision required - and that's why these clocks cannot be cheapo.
An 18 bit converter will deliver superiror results than a 24 bit type if it's controlled by a more precise clock - imho that's one of the reasons for the great reputation of the old A16 (for example)
standard is 75 Ohm coax cable, preferable by star distribution from a central point to each devicehow the connections on the back of the stand alone wordclock are supposed to be connected?
cheers, Tom