4 ms attack and 100 ms decay is more like a fast limiter than a
compressor. 4 ms is only 2 cycles at 500 Hz which is in the "meat" of
the voice region.
Unless you use a de-emphasis network and low-pass filter in the side
chain you're not going to be happy with the compressor even if you
slowed down the time constants. The response "tilt" that you have when
running "flat audio" (really preemphasized audio) through the compressor
combined with the HF noise that's present any time the signal is
anything less than DFQ will drive it into excessive gain reduction. You
didn't say what the design of the control stage was, but judging by the
attack time, I'm guessing it's a peak detector which would likely
exacerbate the problem with regard to the HF noise response.
See a blurb I wrote a few years ago on repeater-builder.com regarding
audio processing in narrowband FM for some more info.
--- Jeff
> -----Original Message-----
> From: [email protected]
> [mailto:[EMAIL PROTECTED] On Behalf Of bradley glen
> Sent: Tuesday, November 22, 2005 5:19 PM
> To: [email protected]
> Subject: [Repeater-Builder] Flat audio -use of compressor
>
>
> Good Day
>
> I would like to have comment on the use of the
> compressor on the repeater hardware between the rx and
> tx units , with that repeater run up using the "flat
> audio principle."
>
> What will happen to the existing audio's attack/decay
> stats?
>
> The expeimental unit made for this test- specs for
> 4ms/100ms Attack/Decay repectively .
>
> Thanks Brad
>
>
>
> __________________________________
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