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Posted by Steve King on 10/06/05 21:47
"Smarty" <nobody@nobody.com> wrote in message
news:iv-dnTLi_8s_CNjenZ2dnUVZ_sidnZ2d@adelphia.com...
> Most if not all of the camcorders do AGC on the audio inputs, and have at
> least 60 to 80 dB of dynamic range. Virtually all the camcorders use
> unbalanced inputs. I have build T-pad attenuators with a simple
> 3-resistor T-network to do precisely what the original post asked for, and
> the attenuators which do around 30 or so dB seem to work just fine.
> Putting in too much attenuation forces the AGC to "gain-up" and crushes
> the SNR by raising the noise floor.
>
> Smarty
>
I have found that Jay Rose is right on, when his tests pointed to an input
signal of -30 db as a sweet spot for VX2000/PD150 type cameras. If I recall
correctly, his test set-up was +4 db out of a balanced mixer with a 35 db
attenuator following.
Steve King
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