Re: Quantizer delay: test results -- making gate pulses from quanti
2003-02-17 by John Papiewski
I wonder if there's something you can trim on the qtkb to fix this delay
everybody's talking about? I've listened carefully to my unit & it
seems fine. I don't have an asr though.
As for the gate pulse, if you patch the quantizer output into the + side
of a comparator and the input into the - side, play with the comparator
bias a little, you get very nice gates, one pulse per quantizer
transition. It's great for those times I use quantizer to staircase a
triangle lfo or slow random voltage.
John P.
Joe Pavone wrote:
everybody's talking about? I've listened carefully to my unit & it
seems fine. I don't have an asr though.
As for the gate pulse, if you patch the quantizer output into the + side
of a comparator and the input into the - side, play with the comparator
bias a little, you get very nice gates, one pulse per quantizer
transition. It's great for those times I use quantizer to staircase a
triangle lfo or slow random voltage.
John P.
Joe Pavone wrote:
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> Hello all.... sorry I didnt jump into this sooner. I have noticed the
> problem with the quantizer, and it did not bother me much until I was
> feeding the QTKB outputs into an ASR... The delay from th quantizer can
> really screw you up here. I talked to Rex about it at length and he felt
> that the quantizer was not the best design and that was it's normal
> behavior.
>
> My solution was to use 2 doepfer quantizers on the side in a small
> cabinet and forget the QTKB. The Doepfer, like the AS quantizer, has a
> gate in and out and since you feed a gate into these quantizers, and
> they then give you a gate out... you just dont have these problems.
>
> Rex suggested that an aditional sample and hold between the qtkb and the
> asr, but that would also reqire some sort of gate delay that would fire
> slightly after the main clock driving the TKB to catch the notes after
> they have settled from the Qtkb output. Seemed like alot to go
> through... I suggested to Rex that he re-disign the quantizer and add a
> gate input.... we chuckled about this for a while.....
>
> ....jp
>
>
>
> peff2cv wrote:
>
>
>>Ok, folks, I have been reading the continuing quantizer thread(s) and
>>decided to settle it once and for all, at least scientifically...
>>
>>I pulled out the oscilloscope and there IS both a delay and slew
>>(portamento) effect imposed by the QTKB. I initally set the TKB up to
>>alternate between min and max pot settings between stages and ran it
>>with a DTG at various speeds.
>>
>>Results:
>>
>>Delay: the QTKB adds an average 2-3 millisecond delay between input
>>and output.
>>
>>Portamento: this is nonlinear so it's hard to quantify in ms/v but I
>>measured it takes ~10 ms to slew between values. The QTKB seems to
>>output a new value at ~2 ms intervals so there are bigger
>>"stairsteps" between TKB stages as you increase the pot values
>>between 2 stages. But, there is definiately a zippering portamento
>>thing going on here.
>>
>>That's the view from the lab. I leave the debate as to the musical
>>implications up to you, the composers. I personally have no beef with
>>delay, but would like to see the portamento eliminated or minimized.
>>
>>cheers,
>>
>>Peff
>>
>>
>>
>
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