[sdiy] companders

[mark verbos]

the only problem with these, or the DBX units is that for my application I would need 9 chips! It turns out that being dual units really helps.


Mark



On Oct 7, 2010, at 1:37 PM, blacet at blacet.com wrote:

> 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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>> 
>> 
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