[sdiy] companders

[blacet at blacet.com]

The 571 was a low parts count workhorse in it's day. But you might want to
look at THAT for an interesting alternative:

http://www.thatcorp.com/4301_Analog_Engine_Dynamics_Processor.shtml

> Compandors can have quite a pronounced effect on noise levels. Analog
> delays in particular made good use of them to produce a reasonably quiet
> device from a "hiss factory"!
>
> The number floating around in my head is -20 dB.
>
>> Another solution would be the use of HighCom Chips or Modules from
>> Telefunken.
>> But this option would only be interesting for Prototypes and not for
>> series production
>> as these chips are now obsolete.
>>
>> But if you can find chips or modules they do a nice job.
>>
>> Eumig and Telefunken TapeDecks used these modules and worked fine.
>>
>> Ciao
>> Peter
>>
>> ________________________________________
>> Von: synth-diy-bounces at dropmix.xs4all.nl
>> [synth-diy-bounces at dropmix.xs4all.nl] im Auftrag von tu at alphalink.com.au
>> [tu at alphalink.com.au]
>> Gesendet: Donnerstag, 07. Oktober 2010 10:43
>> An: mark verbos
>> Cc: Synth DIY
>> Betreff: Re: [sdiy] companders
>>
>> I don't think the 571 style compandor works very well as a noise
>> reduction
>> system. The Roland SBF flanger uses this method and is still rather
>> noisy.
>>
>> Eventide used DBX type II noise reduction on their H910 and H949
>> harmonizers and the H910 delay sounds superb for a 10 bit system. Why
>> not
>> pick
>> up a cheap DBX encoder/decoder and try running the signal through that
>> pre/post your delay?
>>
>> /Tristan
>>
>> On Thu, Oct 7th, 2010 at 7:00 AM, mark verbos <mverbos at earthlink.net>
>> wrote:
>>
>>> I have a noisey as hell delay circuit that I'm trying to rethink. How
>>> much
>>> noise reduction can one expect to get from a classic 571 compander?
>>>
>>> Mark
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>>>
>>>
>>
>>
>>
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