Pro Audio Design Forum

I did listen to the warp (without my shim to make it worse) and it has harmonics that are in-band which sound a little like surface noise. Sounds kinda like a "whump" along with a LF "crackle" which are rotationally-related. On this particular disc it was once per revolution. Ni...

That's pretty cool, man. After our last conversation, I have wondered, since much of it is undoubtedly subsonic, maybe a good way to use this signal is sending it to a spectral display. Not too many preamp/ADC combos would be able to capture frequencies of interest, probably. but I modded my Flat Ph...

Sample the difference signal (vertical) pre-filter and the difference post-filter then null the two.

Maybe you could feed this noise signal to some kind of event indicator meter or LED circuit.

Thank you for your comments, sir!

What I do to listen to what is being mono'd by the EEQ is to feed the left input, dead patch the right channel input, mute the left channel output and monitor the right output. Doing this allows me to hear the deliberately introduced LF crosstalk from L into R. Hmm. I may have to give that a try to...

It occurred to me that the best way to obtain inverted copies of the input would be to use cross-coupled line receivers. Using cross-coupled inputs, both inverted and non-inverted signals are available with identical phase shifts Yes this is what I have been doing since I have a balanced/differenti...

Wayne, I've been playing with your circuits in LTspice. I believe I have come up with a good way to listen to the information removed. This may be useful for deciding whether the chosen filter roll off point is too low or too high based on musical contents presence within the stripped material or if...

In my case I did not want to sacrifice noise margin (Edit: uh SNR) and so talked myself out of the 1246's in the encode. Also I am coming up against rail voltages and 1240's would have put me over when my designs overload margin is considered. Even with the 1243's my current concept still utilizing ...

perhaps I have overlooked something. What I have done to, encode for example, with the 1243's is: M+ -> +in=L+ -in=R- M- -> +in=L- -in=R+ S+ -> +in=L+ -in=R+ S- -> +in=L- -in=R- Ref pins tied to ground, Sense pins tied to outputs. I found these formulas in a Sound on Sound article Left = (M+S)-3dB R...

Thanks for the tips. Using THAT1243's in both the encode and decode makes the math work perfectly. It makes a differential version of the encode and decode seem really clean and nice. You still gotta buffer the inputs though. And you have to do a single ended conversion for the filtering..... And a ...