room responses etc.

[danial stocks]

>
>-nonlinear characteristic of "power amp". How does it change with
>battery life?

use a voltage regulator after the batt.. lose some power but constant 
voltage wwill keep yr amp the same

>-hf artefacts? alias ?
a couple of lpf's ought to do it sallen-key lpf is simple effective & cheap

>-how stable will the pll be?
pll's are always trouble! I have much grief with a pll this week!. poss that 
the SPDIF uses mark phase bicoding - this is what is used in digital 
telephone netwks.. the sending of any kind of data bit is 2 pulses of 
varying identity [high, low, start, stop, error] the whole spec is complex 
there are weird protocols to aviod ambiguity etc, but the general upshot is 
that 2 pulses = 1 clock cycle or something like that.. ie the clock in 
inherent with the data, only a flipflop or something to recover it..dont 
know if this is used in spdif tho


>-every now and then the system has to be calibrated, i.e. a recording
>has to be made in an anechoic chamber. Needless to say I have none.
>would it suffice to go outdoors and do a free air recording?
>What about ground reflexions?
>-microphone characteristic, I don't know which char. is best you could prob 
>make a special variable char mic with an array of simple mics.. I dont 
>think a fully spheroid mic would exist..

Dan
>
>
>m.c.
>

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