Doepfer

1. I corrected my first message to 10 bit (i.e. 1024 steps).

2. The encore expressionist is Midi-to-CV (not CV-to-Midi). E.g. our MCV24
even has 12 bit resolution.

3. It would be no problem to use a 12, 14 or 16 bit ADC but we found that 16
bit is not required or useful for most CV-to-Midi applications. If you for
example connect a simple potentiometer to a 16 bit ADC you will obtain a
permanent data stream even without operating the potentiometer because of
voltage fluctuations (caused e.g. by electrical noise, thermal effects, hum,
crosstalk). For example in our R2M which has 12 bit resolution the
resolution has to be reduced to 10 bit by software in certain modes to avoid
the permanent transmission of redundant data (e.g.
3053-3052-3054-3052-3051-3052 ...).

In addition a higher resolution should be combined with a higher sample
rate. At a small sample rate one obtains similar steps for 10, 12 or 16 bit
resolution as the time intervals are too small to take advantage of the
higher resolution. In Midi one is limited to a max. transmission rate of 31
kBaud - though most devices will hang up if you really transmit Midi data at
with this rate. From my point of view a resolution of 10 bits is sufficient
for a CV-to-Midi device with 64 inputs. A 16 bit CV-to-Midi interface with
64 inputs and high transmission rate will totally block Midi. For a
CV-to-Midi device with a single input (or only a few inputs) the
circumstances are different as you are able to use the full Midi bandwidth
for one parameter only. In this case a higher resolution and higher sample
rate will indeed make sense.

And after all you need a Midi receiver that really processes the 16 bit date
and does not cut the higher bits before processing/calculation.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von the finger
> Gesendet: Montag, 16. Oktober 2006 17:28
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] Re: CV (via HID device) to mac/pc module
>
>
> --- In Doepfer_a100@yahoogroups.com, <hardware@...> wrote:
> >
> > We are also prototyping a similar OEM board with 64 inputs but 8 bit
> > resolution only (USB and Midi, USB powered or powered by a standard wall
> > outlet power supply if USB is not connected). Estimated release
> date: early
> > 2007.
> >
>
>
> Hi Dieter,
>
> 8bit????   is this 1986?
>
> I hope by then it's all grown up and 16bit, or at least 12bit.   any
> which way it would be cool, but 8bit is not very practical in many
> applications (smooth)
> the encore expressionist has been 16bit for how many years now?
>
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> Yahoo! Groups Links
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