Re: Instantaneous (analogue) compression of speech signals

From: Fred Bartoli (fred._canxxxel_this_bartoli_at_RemoveThatAlso_free.fr_AndThisToo)
Date: 01/10/05 

Date: Mon, 10 Jan 2005 11:47:01 +0100

"John Woodgate" <jmw@jmwa.demon.contraspam.yuk> a écrit dans le message de
news:2pRIs3CKdb2BFwac@jmwa.demon.co.uk...
> Does anyone here have any experience of instantaneous (analogue)
> compression (aka soft clipping) of speech signals? I've been doing a
> little work on it but I'm unable to judge the resulting sound quality.
> Why do treble boost controls no longer have any audible effect for me?
> (;-)
> --

John,

I've not followed the whole thread so I don't know whether sb proposed this
or not.

              10n
      2.2K
       ___ || ___
    .-|___|---||---+--|___|--+ .--------.
    | || | | | |
    | ___ | 15K | | |
   -+--------|___|-+ | | |
                   | | | |\| | 15K
              15K | |\| | 1K '--|-\ | ___
                   '---|-\ | ___ | >--'-|___|--+-----
                       | >--+-|___|--+--+----|+/ |
                   .---|+/ | | |/| |
                   | |/| | | ---
                  === - V 10n ---
                  GND 2 diodes ^ - |
                                      | | |
              (or diode monuted BJTs) | | ===
                                     ====== GND
                                     GNDGND

(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)

I didn't tried it in real because I don't have what's required, but in
simulation it has some interesting effects.

I guess 1kHz is about a good corner frequency but of course you can adapt
it. 

-- 
Thanks,
Fred.

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