Re: Zipper Noise, an example

[Charles Zwicky <cazwicky@earthlink.net>]

It really falls on the Beta testers. If they don't use the devices 
the way that us on the cutting edge might then these things slip past 
them. This is why the RC-50 gets complaints here but the LP-1 and 
2880 don't...and vice versa in the mainstream press.


>Not to defend programmers who don't do thier own level of testing, but
>professional audio companies should have someone besides the programmers 
>who
>verifies that the quality of the output meets the company standard.. 
>But, it is
>also my experience that the 'test dept', or more accurately 'quality 
>assurance'
>is usually the most understaffed department.. and, on top of staffing 
>issues,
>they are often not given control over WHEN something ships.. management 
>will
>often override concerns of quality to hit a ship date.. just my two cents 
>from
>the trenches.. :)
>
>peace
>-cpr
>
>Quoting Charles Zwicky <cazwicky@earthlink.net>:
>
>>
>>
>>  The zipper noise can easily be supressed by interpolating those
>>  steps in the gain control algorhythm.
>>
>>  Most programmers don't listen too closely, apparently.
>>
>>
>>  >Per Boysen schrieb:
>>  >>You hear the zipper noise (of the TC Electronix FireworX) when I
>>  >>use the MIDI expression pedal to adjust the volume, something you
>>  >>do a lot when playing guitar (but never with wind instruments).
>>  >>It's a little annoying but not that bad that I wouldn't use the
>>  >>volume pedal at concert. Strange thing is that when I use a MIDI
>>  >>expression pedal to adjust the beat sync tempo division for the LFO
>>  >>bound filter (on the reverb return) there is no such noise.
>>  >
>>  >Its very likely not an interference, its just unsmoothed direct
>>  >control of the amplitude. 128 steps are not fine enough...
>>  >You can test this, as its more audible on low frequency sine waves.
>>  >if you feed a sound without much overtones/treble and control the
>>  >volume is it more audible? Its hard to believe, that they don't
>>  >smooth it.
>>  >In my Max patches I usually smooth it with 20 ms which creates an
>>  >acceptable latency for volume control...
>>  >
>>  >Stefan
>>  >
>>  >--
>>  >Stefan Tiedje------------x-------
>>  >--_____-----------|--------------
>>  >--(_|_ ----|\-----|-----()-------
>>  >-- _|_)----|-----()--------------
>>  >----------()--------www.ccmix.com
>>
>>
>>  --
>>  ...
>>  http://www.zmix.net
>>
>>
>
>
>
>
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