Re: Instantaneous (analogue) compression of speech signals

From: Keith Wootten (keith_at_nononono.co.uk)
Date: 01/04/05 

Date: Tue, 4 Jan 2005 16:37:01 +0000

In message <bKNzkYH7rp2BFw98@jmwa.demon.co.uk>, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> writes
>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.

It may be effective in conjunction with diode clipping - a small lamp
will respond in (probably) some few milliseconds, so the initial harsh
diode clipping would be short-lived and possibly less audible and less
objectionable as a result. Speculation, naturally.
>>
>>Wayne Bridges is the expert with this method of course.
>>
>Does he have a web site?

No, it was a poor joke. DSP may be over the top, but a PIC (or
whatever) with ADC, look-up table and DAC would be pretty simple for a
Lo-Fi implementation.

Cheers 

-- 
Keith Wootten

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