AW: [sdiy] Re: Companders

[mark verbos]

I am interested.

Ullrich Peter wrote:

> >I believe there was a German company that also made compander-based noise
> >reduction circuitry. In their system, the audio spectrum was split into
> >three different bands. The Bass, Midrange, and Treble were all sent through
> >different companding circuits. This was supposed to greatly reduce the
> >"pumping" or "breathing" effects like the ones you have described. I never
> >did have the chance to use this "tri-band" style of noise reduction, but it
> >seemed to be a good idea. Does anyone on the list know about the circuitry
> >I'm referring to, but can't remember the name of? If anyone has used it,
> >did it work better than DBX?
>
> You mean HighCom from Telefunken! It was used in some tapedecks from EUMIG,
> TELEFUNKEN,...
>
> I still have some chips lying around and also untested PCBs as I wanted to
> switch it in front and after a 8 bit digital delay line to get a better dynamic response
> then the theoretical 48dB. But I never finished the project...
>
> The chips name was  U401BR from Telefunken (TFK).
> If anyone is interested I could make a scan of the Highcom-Module...
>
> Ciao
> Peter
>
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>                    Ing. Peter Ullrich         mailto:ullrich at kapsch.net
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--
mark verbos

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