4 ms attack and 100 ms decay is more in line with a fast limiter than a
compressor. 4 ms is only 2 cycles at 500 Hz (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 to make it act more like a compressor.
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.
See a blurb I wrote a few years ago on repeater-builder.com regarding
audio processing in narrowband FM.
--- Jeff
> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of bradley glen
> Sent: Tuesday, November 22, 2005 5:19 PM
> To: Repeater-Builder@yahoogroups.com
> 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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