frequency Counter module (calibrated)

[Bud Weiser]

Did or does such tool exist for SCOPE ?

I´d need as a tool supporting calibration of analog synths.



Bud

[valis]

What do you mean by frequency counter? Tuner?

[Bud Weiser]

What do you mean by frequency counter? Tuner?

https://eu.mouser.com/c/test-measuremen ... -counters/

Well, these are very wide range and very accurate too,- and very expensive.

The typical guitar/bass tuners don´t work well for analog synth calibration.
There´s always something missing,- lowest and/or highest octave of the overall range of the synth´s oscillators,- Minimoog D in my case.
Or, they aren´t accurate enough,- typically +/- 1Hz only.

The reason why I need better accuracy:

Usually, you calibrate the Minimogg D´s 3 OSCs to it´s 3 1/2 oct range keyboard,- exactly to the 3 available "A" notes of that keyboard range,- and then do it for all the octave range steps (32' - 2').
It´s a procedure described in the printed manual/schematics.

But NOW, I have latest Lintronics LMC-2 installed, and that MIDI interface offers a range of 64-MIDI notes.
That´s way harder to calibrate than for the range of "only" 44 keys.

Formerly I used my trusty KORG WT-12 tuner which WAS accurate enough and offered extended range.
I also used it to tune Fender Rhodes pianos and Hohner Clavinet D6,- but it became unreliable.
I also own a KORG rackmount tuner,- but accuracy is 1Hz at best only also.
I got a Peterson strobo tuner from backliner usually tunig guitars and bass,- but it lacks overall range while accuracy is better.

Now, the Minimoog D has ultra precision multi-turn trimmers replacing the old standard trimmers.
It´s hard to recognize in which direction it goes when turning the pot and until the ear recognizes significant change of frequency.
An accurate frequency counter would change that when accuracy would be a fraction of 1 Hz,- 0.1Hz p.ex.
It would be easily visible then.
Let´s say over a range of 10 - 12 octaves C - C.

The target is not (only) tuning an instrument.
Instead, very accurate calibration over a wide range before using the octave/footage switches of the Minimoog D´s OSCs and while using MIDI input form MIDI controller over the MIDI interface´s range of 64 MIDI notes (which is the range of a Wurlitzer 200A piano).

And yes, it would be a great tuner in SCOPE too when being combined w/ kind of analog VU meter style indicator.

But I have no clue if that would be realizable in SCOPE SDK at all.



Bud

[valis]

I had wondered if that's what you were referring to. I asked years ago if the DSP boards could do this (the Chips can, or at least some of the ADA chips can), but the bandwidth and samplerate on those vastly exceeds Scope's abilities. We're 96Khz atm... not 1.5-3Ghz.

[nebelfuerst]

What ist the highest and lowest frequency required for measurement ?
Shouldn't something up to 2kHz catch your highest tones ?

[Bud Weiser]

I had wondered if that's what you were referring to. I asked years ago if the DSP boards could do this (the Chips can, or at least some of the ADA chips can), but the bandwidth and samplerate on those vastly exceeds Scope's abilities. We're 96Khz atm... not 1.5-3Ghz.

I don´t think 1.5 -3GHz are needed for my purpose.
That´s why I don´t want to invest in such a piece of hardware.



Bud

[valis]

It would be necessary for phase, but not dominant frequency

[Bud Weiser]

What ist the highest and lowest frequency required for measurement ?
Shouldn't something up to 2kHz catch your highest tones ?

21.83Hz - 7902.14Hz on a 6-digit display like XXXX.XX (0.01Hz accuracy) = 8 1/2 octaves F - C

Minimoog D lowest note is "F".

Lowest C might be impossible,- low E would be 20.60Hz then.

Would that be possible to realize w/ Scope SDK ?



Bud

[Bud Weiser]

It would be necessary for phase, but not dominant frequency

dominant frequency is it.

O.T.:

JFYI,- opening and typing posts on PlanetZ behaves very slow on my side since yesterday afternoon (europaen time).

[valis]

We are under attack again. About 1-2TB/month rather than the typical 3-5 GB. Costly overages for me, and I already have cloud flare passively protecting us. I might have to upgrade.

I’m sorry, it’s always overseas cheap hosting and it’s round robin every few days to knock out each hosting center. Been ongoing since 2014.

[nebelfuerst]

I just experienced 20min of this forum beeing unavailable.

For frequency:
I found a file "M4-Tuner-SR-PB-20200609a03b.zip" in this thread from a well known member of this forum:

viewtopic.php?p=345309&hilit=M4+tuner#p345309

The picture in the zip looks like a solution to your problem. But I get "missing Ostuner.dsp".. so I cannot run it on my system.

[valis]

Posted on the forum issues here: viewtopic.php?p=370416#p370416