[sdiy] converting white noise to pink noise

Sean Ellis tensiontype at hotmail.com
Tue Mar 4 19:06:19 CET 2008


Now I'm really curious, dont suppose anyone has a 5837 burdened synth around 
and could record some samples of it? If it's that bad I wonder how people 
could use it in a quality piece of gear....

----- Original Message ----- 
From: <harrybissell at wowway.com>
To: "Robert Lorentz" <robert.lorentz at gmail.com>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, March 04, 2008 4:45 PM
Subject: Re: [sdiy] converting white noise to pink noise


> The MM5837 is really just misapplied in synth applications.
> The repeatability is a boon in apps like room equalization and
> other audio measurements.
>
> Compared to most semiconductor junction noise sources, its really
> good.
>
> Just sucks for synthesizers...
>
> I don't know od another single-chip noise source, although some
> have suggested that a small PIC micro might be prorammed to perform
> this function.
>
> Magnus Danielson has a list (somewhere) of optimum LFSR
> noise sources.
>
> I have one made with three chips (4001, 2x 4006) that does not
> noticibly repeat...
>
> H^) harry
>
>
> On Tue, 4 Mar 2008 10:38:43 -0500, Robert Lorentz wrote
>> My question is, since the MM5837 is garbage white noise on a chip,
>> what is a better (preferably not obsolete) noise IC to use for this
>> and other applications?
>>
>> Robert
>>
>> On 3/4/08, harrybissell at wowway.com <harrybissell at wowway.com> wrote:
>> > LOL
>> >
>> > Make some ocean or wind sounds, listen to the little train
>> > go chu-chug-chug in the background
>> >
>> > H^) harry
>> >
>> >
>> > On Tue, 04 Mar 2008 06:19:18 -0700, Scott Gravenhorst wrote
>> > > Yes, thanks Dave.
>> > >
>> > > I like this little bit:
>> > >
>> > > "The MM5837 provides a uniform noise quality..."
>> > >
>> > > shhh-tick-shhh-tick-shhh-tick-shhh-tick-shhh-tick-shhh-tick
>> > >
>> > > I guess "uniform" also includes the precise replication of the
>> > > repeat pattern...
>> > >
>> > > John Mahoney <jmahoney at gate.net> wrote:
>> > > >At 01:47 AM 3/4/2008, Dave Manley wrote:
>> > > >
>> > > >>I put a scan of the pink noise generator from the 1976 Audio 
>> > > >>Handbook
> here:
>> > > >>
>> > > >>http://www.sonic.net/~dlmanley/PinkNatSemiAudioHandbook1976.jpg
>> > > >>
>> > > >>The -3dB/octave response is claimed to be +/- 1/4dB from 10Hz to 
>> > > >>40kHz.
>> > > >>
>> > > >>-Dave
>> > > >
>> > > >
>> > > >Aaaargh, it's the dreaded MM5837, again! Ah, well, it's fine for
>> > > >testing purposes, it's just no good for making music.
>> > > >
>> > > >Thankfully, the pink noise filter is a separate circuit -- and it's
>> > > >totally passive, to boot. Thank you, Dave.
>> > > >
>> > > >John
>> > > >
>> > > >
>> > > >--
>> > > >No virus found in this outgoing message.
>> > > >Checked by AVG Free Edition.
>> > > >Version: 7.5.516 / Virus Database: 269.21.4/1310 - Release Date: 
>> > > >3/4/2008
>> > 8:35 AM
>> > > >
>> > > >
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>> > >
>> > > -- ScottG
>> > >
>> > > -----------------------------------------------------------------
>> > >
>> > > -- Scott Gravenhorst
>> > > -- GateMan-III - FPGA Based Monophonic MIDI Synthesizer with SVF
>> > > -- PolyDaWG/8 - FPGA Based 8 Voice Polyphonic MIDI Synthesizer
>> > > -- phLUTe - FPGA Based Monophonic Physical Model MIDI Synthesizer
>> > > -- FatMan: home1.gte.net/res0658s/fatman/
>> > > -- NonFatMan: home1.gte.net/res0658s/electronics/
>> > > -- When the going gets tough, the tough use the command line.
>> > >
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>> > Harry Bissell & Nora Abdullah 4eva
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>
>
> Harry Bissell & Nora Abdullah 4eva
>
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