RE for analysing (CV) LFO Rate?
you can only create cv-note-to-freq calc by the chronologist's RE.
CMD: Equation and Constant.dioxide wrote:Which device does this?ljekio wrote:you can only create cv-note-to-freq calc by the chronologist's RE.
Formula:
Freq = 13.75 * 2 ^ (( P - 9 ) / 12)
Where P is pitch in semitones.
Note, but not Frequency.Loque wrote:CVA-7 does this or just connect a CV to a Combinator note input.dioxide wrote:Which device does this?ljekio wrote:you can only create cv-note-to-freq calc by the chronologist's RE.
My calculator here:
Clarification: the calculator will not be able to convert a live input of CV, only the parameter CV-Pitch that you set in the device.
Frequency analyzer of the live LFO signal is impossible, IMHO
Frequency analyzer of the live LFO signal is impossible, IMHO
If this is real, then the output data will be very coarse. And then if the LFO is simple, not combined.
You can convert CV to audio and open saved audiofile into some editor like Sound Forge for precision frequency analyse.
You can convert CV to audio and open saved audiofile into some editor like Sound Forge for precision frequency analyse.
Last edited by ljekio on 24 Apr 2017, edited 1 time in total.
But audio analyzers usually show signals from 20Hz or higher.dioxide wrote:It will be a Sine wave.ljekio wrote:If this is real, then the output data will be very coarse. And then if the LFO is simple, not combined.
How catch low freq?
That's exactly what I thought. It's a difficult one.ljekio wrote:But audio analyzers usually show signals from 20Hz or higher.dioxide wrote:It will be a Sine wave.ljekio wrote:If this is real, then the output data will be very coarse. And then if the LFO is simple, not combined.
How catch low freq?
If I've got this right no RE required, but you do need to record the LFO's curve into the sequencer and use the position marker to note the time position of a completed period, dividing the number of cycles by the time position of last cycle.dioxide wrote:Is there a tool that allows you to find the rate of a CV LFO in Hz? Or perhaps this could be done by converting it to audio first?
Does anyone have any tips or ideas? Thanks!
To explain further;
- Load an instance of Thor and reset the device.
- Hook up your LFO cv output into the Thor's CV1 input.
- In Thor's modulation matrix select; Source: CV1. Level: 100. Dest: Audio 1. Level: 100.
- Click Rec Source in Thor's Mixer Channel
- Load an Audio Channel and choose Input Source for Thor 1 Left
- Reset song to time position 0 and hit record. The LFO wave form should now be drawn in the Audio Channel's track.
- Hit stop and move position marker to the point where a full period or cycle has been achieved.
- Divide 1 by the time position and you have the frequency.
- To make it easier to identify where one cycle has been achieved, trim the start of the clip to coincide with the first trough on the wave form. The next trough will be first period.
- Doing the same over more cycles may increase accuracy, but don't forget to change the dividend to suit. In other words if you record the time position over ten cycles your calculation will be 10/time position.
PSoames wrote:If I've got this right no RE required, but you do need to record the LFO's curve into the sequencer and use the position marker to note the time position of a completed period, dividing the number of cycles by the time position of last cycle.dioxide wrote:Is there a tool that allows you to find the rate of a CV LFO in Hz? Or perhaps this could be done by converting it to audio first?
Does anyone have any tips or ideas? Thanks!
To explain further;As I say, I think this works. It has in my limited trials.
- Load an instance of Thor and reset the device.
- Hook up your LFO cv output into the Thor's CV1 input.
- In Thor's modulation matrix select; Source: CV1. Level: 100. Dest: Audio 1. Level: 100.
- Click Rec Source in Thor's Mixer Channel
- Load an Audio Channel and choose Input Source for Thor 1 Left
- Reset song to time position 0 and hit record. The LFO wave form should now be drawn in the Audio Channel's track.
- Hit stop and move position marker to the point where a full period or cycle has been achieved.
- Divide 1 by the time position and you have the frequency.
- To make it easier to identify where one cycle has been achieved, trim the start of the clip to coincide with the first trough on the wave form. The next trough will be first period.
- Doing the same over more cycles may increase accuracy, but don't forget to change the dividend to suit. In other words if you record the time position over ten cycles your calculation will be 10/time position.
Thanks, that is a good solution!
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