[sdiy] companders

[Chromatest J. Pantsmaker]

what sort of chips would these be?

I'm working at a radio station and in their "boneyard" is some sort of
rackmount DBX system... if I knew what to look for, I could probably
check the cards out and see what's salvageable.

On Thu, Oct 7, 2010 at 11:56 AM, mark verbos <mverbos at earthlink.net> wrote:
> 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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-Chromatest J. Pantsmaker
http://www.chromatest.net