[sdiy] BBD's in series and accumulative S/N ratio degradation.

[aankrom]

I wasn't suggesting that 63dB was the same as 60dB, just that two sound 
sources producing 60dB wasn't merely doubled to 120dB to get double the 
loudness.

The only advantage  can see in using multiple MN3006's is that 
technically I can clock each one faster than a corresponding single BBD 
with the same number of stages.

It sort of boils down to me being annoyed that there is no 8-pin 
MN3004, but there is an 8-pin MN3204. This is in relation to my building 
a Korg ensemble replica.

I'm also curious to see how doubling (quadrupling?) the clocks in my 
Roland MKS-50 and using MN3007's in the stereo chorus circuit sounds. I 
hear bits of heterodyning and figured a higher clock rate should fix it. 
But an MN3009 has a better S/N ratio than an MN3007. Trading one kind of 
noise for another I suppose, but I recall there being compandors in 
there that may help. But I digress...

AA

On Fri, 23 Dec 2011 12:22:53 +0100, Mattias Rickardsson wrote:
> 3 dB more is not "the same" at all, it's twice as much.
> But it seems like you already know that. ;-)
> And yes, that's probably how the S/N ratios will add up.
>
> Anyway, I'd also be very interested in hearing people's experiences
> from using multiple BBDs, either with the same clock or with 
> different
> ones.  :-)
>
> /mr
>
> On 23 December 2011 05:20, aankrom <aankrom at bluemarble.net> wrote:
>> I have several MN3006's that I thought of using, but to get longer 
>> delay
>> times, I plan to use two or three in series. Am I right in thinking 
>> that the
>> S/N ratio would be the same as that of a comparable single BBD's S/N 
>> ratio?
>> That is you don't just add up what appears to be accumulative S/N 
>> ratio loss
>> based on the rated S/N ratio of the device since it's in dB's. Like 
>> if two
>> people are talking to you at a level of 60 dB's each, the sound 
>> level isn't
>> 120 dB's, but rather 63 dB's. I know that under-clocking the MN3006 
>> would
>> make the S/N ratio sucky for sure... Not to mention limiting the
>> bandwidth...
>>
>> AA
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy