Re: Instantaneous (analogue) compression of speech signals

From: Lasse Langwadt Christensen (langwadt_at_ieee.org)
Date: 01/07/05 

Date: Fri, 07 Jan 2005 23:08:31 +0100

John Woodgate wrote:
> I read in sci.electronics.design that Keith Wootten
> <keith@nononono.co.uk> wrote (in <Tzyj2HBo8o2BFwOk@clara.co.uk>) about
> 'Instantaneous (analogue) compression of speech signals', on Tue, 4 Jan
> 2005:
>
>>In message <2pRIs3CKdb2BFwac@jmwa.demon.co.uk>, John Woodgate
>><jmw@jmwa.demon.contraspam.yuk> writes
>>
>>>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?
>>>(;-)
>>
>>Howzabout a potential divider with the top leg being a small
>>incandescent lamp. Also acts as an emergency beacon where the louder
>>you call for help, the brighter is the lamp.
>
>
> Interesting, because it has potentially less distortion than diode
> clipping. It's not quite 'instantaneous', though, and it's not so easy
> to find suitable lamps.

I have a pair of speakers that use a lamp it to protect the tweeters, but
I'd say its more of a power limiter than a voltage limiter
and wouldn't it violate your requirement of not having a time constant to
worry about ?

-Lasse

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