The W&F Analyzer Project, Uberrimus

[USER]

It's so nice not to have FOMO for multi-instrument. Thank you!

This one shows some odd peaks. Could it be the tonearm/bearings?

 

[JP]

You ain't seen nothin' yet. Did you read the spec?

This is the initial waveform navigator:

Along with zoom and pan, it'll have a selection window so you can choose a slice of the file to re-measure. It'll operate similarly to my browser DBT testing loop selector:

And from the spectrum plot you'll be able to select harmonics to overlay on the primary waveform similar to:

 

[Balle Clorin]

Nice stuff! Maybe time to dig out old wf files, and make some new

 

[JP]

Nice stuff! Maybe time to dig out old wf files, and make some new

I could use a raw data file from a shaknspin.

 

[Bland_username42069]

You ain't seen nothin' yet. Did you read the spec?

This is the initial waveform navigator:

Along with zoom and pan, it'll have a selection window so you can choose a slice of the file to re-measure. It'll operate similarly to my browser DBT testing loop selector:

View attachment 518310


And from the spectrum plot you'll be able to select harmonics to overlay on the primary waveform similar to:

View attachment 518311

As an idiot does this mean one can correct for rotational variations throughout a piece of music?

 

[JP]

No.

 

[JP]

Have this 0.47-0.5 Hz and 0.98-1.0 Hz peaks which are different from the rotational 0.55 and 1.11 peaks With both test records. Bearing issue?

Could be. The polar has a weird very low f artifact too.

 

[JP]

This one shows some odd peaks. Could it be the tonearm/bearings?

Probably not - those tend to be much higher frequency.

 

[Balle Clorin]

I could use a raw data file from a shaknspin.

Any particular turntable? I probably have 30 or so different,

 

[JP]

Doesn't matter - just want the data format and sample data.

 

[Balle Clorin]

shakspin data.' Player given in in name. Sample Rate 500 times per sec

 

[Balle Clorin]

It works for me too!!

May I suggest an option to plot the FFT to 200hz, as that can show effects om transformer vibration and so on

Same turntable another test record

The joy of a 15 minute ride with belt drive....

A better day...shorter run

 

[JP]

May I suggest an option to plot the FFT to 200hz, as that can show effects om transformer vibration and so on

Does that bleed through on the shankspin sensor? FM from the arm? It's to fast to actually being affecting platter rotation.

What's the method on the last two? Those are very noisy.

 

[Balle Clorin]

I see it on my Denon 51F on 3150hz wav file... became lower when I put som sorbothane on the (hanging) transformer touching the internals, see also cogging at 66.67 hz on my fisher 6330 caused by 120 poles

 

[Balle Clorin]

What's the method on the last two? Those are very noisy.

last is a very very noisy record, no bandpass, second last is 15 minute track with drift

 

[Thomas_A]

Could be. The polar has a weird very low f artifact too.

Was thinking whether it is belt issue/belt creep. Since it should be slightly off and lower than the rotational speed.

 

[Thomas_A]

It works for me too!!

May I suggest an option to plot the FFT to 200hz, as that can show effects om transformer vibration and so on
View attachment 518439

Same turntable another test record
View attachment 518441



The joy of a 15 minute ride with belt drive....
View attachment 518435

A better day...shorter run
View attachment 518437

Think you have similar extra peaks. Belt creep?

 

[JP]

Can't help you there - I've zero experience measuring belt drives.

 

[Thomas_A]

Can't help you there - I've zero experience measuring belt drives.

Most likely belt creep + belt inconstency once per belt revolution. Better or cleaner belt needed.

 

[JP]

I see it on my Denon 51F on 3150hz wav file... became lower when I put som sorbothane on the (hanging) transformer touching the internals, see also cogging at 66.67 hz on my fisher 6330 caused by 120 poles

View attachment 518443

I'm not questioning that they bleed through, I'm questioning it it's an actual angular change or just the cart picking up vibration. Look at your FFT - all of the rotational harmonics fall off by 30Hz.