[sdiy] coupler module2

[Fdi]

Then is nice to have a tone generator to the bal and unbal outputs so you
can adjust your overall level to -12dB full-scale (for 16bit) or to -20dB
full-scale (for 24bit) on the recording system and an overload indicator
adjusted at the equivalent -2 or -1dB full-scale of the (digital 16 or
24bit) recording system, so you just look to that LED/s on your output
module.
Anyhow, if recording on a 24bit system, you have plenty of margin, once you
adjust with the reference tone
--



f
*




> De: "Czech Martin" <Martin.Czech at micronas.com>
> Fecha: Tue, 26 Aug 2003 15:49:05 +0200
> Para: <jhaible at debitel.net>
> CC: "Peachey, Dave" <dave.peachey at rbs.co.uk>, "Sdiy (E-mail)"
> <synth-diy at dropmix.xs4all.nl>
> Asunto: RE: [sdiy] coupler module2
>
> The 10mV example was certainly exagerated,
> it should just illustrate
> "why are there so many different levels"
> and "why is there a need for scaling"
> as somebody has asked.
>
> So , really you have something between 300mV/1V and 13V,
> which is still a lot (~ 33dB / 22dB).
>
> Somewhere I read that dBu and dBv is sometimes the same
> (from the old times, when the letter v was equal for u
> and vice versa, roman empire).
>
> dBu seems to refer to 0.775 V RMS, sometimes written as dBv
> dBV seems to refer t0 1.000 V RMS
>
> After all, there is no science in it, just calculating with logarithms
> and some definition of the reference level.
>
> If you go to digital recording, a peak meter is a must.
> A 10 min recording is easily noticeable spoiled from 10ms overdrive,
> since there is no headroom above full scale.
> So a comparator with some storage device to light a red
> LED is a good idea, if you do not want to look constantly
> at the meter for 10 min.
>
> m.c.
>
>> -----Original Message-----
>> From: jhaible at debitel.net [mailto:jhaible at debitel.net]
>> Sent: Dienstag, 26. August 2003 14:06
>> To: Czech Martin
>> Cc: Peachey, Dave; Sdiy (E-mail)
>> Subject: RE: [sdiy] coupler module2
>>
>>
>>> E.g. a cascade filter will need small signal levels,
>>> like 10mV, this is also true for other structures
>>> wich use "linearised" junctions as variable gain circuits.
>>
>> You will *never* want to run 10mV signals over patchcords.
>> Always amplify them to 1V at least at the module output
>> and attenuate it again at the module input.
>> Otherwise your ground will "bypass" some of the unfiltered
>> signal (in case of the module being a filter).
>> And pick up hum like hell, of course.
>>
>> JH.
>>
>> -------------------------------------------------
>> debitel.net Webmail
>>
>
<br><br>
Direccion.com<br>
________________________________________________<br>
This
mail was sent by Direccion.com 2.0