Beta Test: Multitone Loopback Analyzer software

[Sokel]

That's the right results:

Spectrum

FR

Phase

 

[pkane]

That's the right results:

View attachment 242418


Spectrum


View attachment 242419

FR


View attachment 242420


Phase

That looks more like it!

 

[Sokel]

Is there something wrong with the levels?

Edit:Ooops,my bad,had dbFS chosen.

 

[pkane]

Is there something wrong with the levels?


View attachment 242422

Looks OK to me. The more tones you add, the lower the amplitude of each tone will have to be. Remember, all the tones add up to the actual signal you're recording. If you use a 32 tone multitone, the amplitude of each tone will be higher, while the overall test signal level will remain about the same.

 

[pkane]

Posting this to keep a summary of the various mouse/keyboard tricks in the plot area of Multitone (applies to all plots):

• Hold down the shift key and drag the mouse from a point a little away to the desired point you want to label: adds an arrow with the measurement. You can press the right mouse button to remove the latest annotation, then draw another one. Or keep pressing right mouse button to remove all, one at a time
  
  
• Ctrl+right click lets you choose an area on the graph to zoom in
  
  
• You can drag and zoom in/out on any point on either axis using the mouse and scroll-wheel. Just position the mouse over the labels of X or Y axis, then drag if you want to just move the plot along that axis, or use the scroll-wheel to zoom in around any point on the axis without touching the other axis (zoom only in X or only in Y direction)
  
  
• Zoom-in or out in both axis around any point on the plot by positioning the mouse at that point (click once to make sure that plot is in focus) and using the scroll-wheel to zoom in or out
  
  
• Drag the plot in any direction by pressing left mouse button and dragging in the desired direction

 

[Sokel]

What I am doing wrong in Jtest 16 and 24 and I get more than 0db reading even with -70db or lower gain (even at -100db,haven't tested lower) setting?

 

[Sokel]

Strangely E-Mu works (I think) even with 0db gain:

J16

J24

 

[pkane]

What I am doing wrong in Jtest 16 and 24 and I get more than 0db reading even with -70db or lower gain (even at -100db,haven't tested lower) setting?


View attachment 246414

Use dBFS instead of dBr.

 

[Sokel]

Use dBFS instead of dBr.

I don't mean in the chart,I mean actual level,it clips!

 

[pkane]

I don't mean in the chart,I mean actual level,it clips!

Sorry, but what clips and how do you know that it clips?

 

[Sokel]

Sorry, but what clips and how do you know that it clips?

See the EMU playing gain at -4.98 dbr with 0db play gain?
Now look at khadas 0dbr at -70db play gain.
The bar becomes red.

 

[pkane]

See the EMU playing gain at -4.98 dbr with 0db play gain?
Now look at khadas 0dbr at -70db play gain.
The bar becomes red.

Red bar is shown when a some samples reach a level close to 0dBFS. JTest signal is generated at a certain dBFS level, play gain adjustment has no effect on it.

 

[Sokel]

Red bar is shown when a some samples reach a level close to 0dBFS. JTest signal is generated at a certain dBFS level, play gain adjustment has no effect on it.

I see.
So something broken somewhere.
I'll test and see,thank you!

 

[pkane]

I see.
So something broken somewhere.
I'll test and see,thank you!

-70dB or -200dB play gain setting will still generate and output at the same exact level as required by JTest signal specification.

 

[Sokel]

I just had to little lower the level in the windows mixer

(I'm embarrassed )

 

[morillon]

20-96000 ? 96000?

jtest 24 bit in 48k ( 12khz)
(normally 12k at -3.01db)

 

[pkane]

20-96000 ??? 96000?

jtest 24 bit in 48k ( 12khz) !
(normally at -3.01db)

JTest is 1/4 of the sampling rate square wave plus the least significant bit being toggled every 192 samples, IIRC.

 

[morillon]

yes but why this 96000 for a 48k 24bits jtest?

 

[Sokel]

I was trying to make it work in the first place
Better now?

 

[morillon]

try with rew...
(normaly for a 48k24 you have a 250hz etc)

sorry..i speak just in spdif direct mesureament...
you???