Fairlight-CMI

Yes, Adrian's got a good point there. The variable sampling is generated by
"rate multiplier" chips which get the inbetween frequencies by stickingin
extra samples in strange places so that on average the freqnacy is exatc but
it jitters all ovber the place.  This is the cause of what we called "the
birdies" which are apparently random notes that appear if you hit a
frequency that results in artifacts in the audibe range.  
 
Peter


  _____  

From: Megacurve [mailto:megacurve@yahoo.com.au] 
Sent: Saturday, 11 August 2007 5:15 PM
To: Fairlight-CMI@yahoogroups.com
Subject: Re: [Fairlight-CMI] Re: Sound Character Comparion between 8bit
(II/IIx) and 16bit...



Steve,

It isn't just the tracking filters. The CMI's used a
variable samplerate, with a huge range. There isn't
any digital sample interpolation happening. Was it 7
octaves of shift possible? I don't remember If you
upshifted the sample you can get harmonics that are
higher than in the original sample rates 1/2 of the
input filter cut off frequency. Much Higher.

A digital version of playing an audio tape faster or
slower.

Other samplers, like Roland, used a fixed sample rate,
with only a 2 octave shift range. 
The method of digital sample interpolation with a
fixed sample rate also makes a huge difference, and
will contribute a lot to the resultant sound, but in
all cases you never got any harmonics above the
original sample filter cutoff...

But, it was just a cooler bunch of people that made
it..

Adrian S. Bruce
www.artandtechnology.com.au

--- Steve Rance <steve@fairlightus. <mailto:steve%40fairlightus.com> com>
wrote:

> The main differance in sound quality when samples
> are not played at the 
> native pitch is due to the design of the tracking
> filters used in all 
> versions of the CMI. Other samplers in the era used
> different 
> (cheaper!) methods to change the pitch of samples.
> 
> [Steve]
> 
> 
> 
> 

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