Holographic imaging

Unsound,

I'm assuming your reference to "that the knob on your gear" is the Wavefront Timing Control (now on the remote).

The internal Doppler detection and correction happens in real time and in a pure analog mode. These detectors handle the dynamic changes in velocity (on the fly) while the WTC handles the static velocity correction that is the result of all upstream and downstream electronics.

There is of course a limit to the extent it can recover the source dimensional venue. It cannot “fix” a bad recording.

Atmasphere,

I’m sorry the first sentence should have been separated from the second sentence.
And I did not say that a spike was too subtle to show up. I was saying that the reason that the Doppler shift would not show up is because it is not nearly as strong a shift or event to cause enough energy to slide up the spectrum and show up as a spike. In all likelihood it resides so close to the fundamental (spike) as to be hidden by it. A 1khz spike with a smaller 1005 hz (spike) would be difficult to discern.

Roger

My closest experience with holography was at a NYC Stereophile show years ago. The demo was in the David Wilson room and his source was the Basis Evolution turntable. He played a cut from an LP called "Bob and Ray throw a Stereo Spectacular" in which you can "see" the butler's footsteps scale up the stairs.

David Wilson was demonstrating the differences between 3d realism from analog and how its diminished thru redbook.

Lets assume that a 200 Hz bass note is modulating the 1000 Hz note.

This will cause a 1khz tone to shift up to 1005 hz At this level it is a mere twinkle in the eye of “harmonic distortion” but is distortion nonetheless.

Not the way I understand Fourier analysis. You would not get a 1005 Hz note (this note only exists in theory or in the infinitessimally short space of time or "twinkle of an eye" and you woudl not be able to hear it as it would have no power spectrum as it does not exist over time).

I think you would end up with a 1 Khz signal with side bands at 1200 Khz and 800 hz and 1400 Khz and 600 hz etc. etc. as the non-linearity would cause IMD that had a power spectrum that relates to the mixing of the 200 Hz bass note with 1 Khz tone under a non linear amplifying condition.

The way I understand fourier analysis - shifts in time are similar to other non linearities and can be treated that way - in the same way jitter shows up as side band distortion on audio signals when jitter has a distinct periodicity to the signal (i.e not just uncorrelated random jitter that will simply raise the noise floor).

Achieving a 3-d hologram is (to me) the very goal of this hobby. It isn't an artifact...It's success. It's symetry of gear and room and a great recording. When I have Ray Brown playing that double bass in true 3-d hanging between my speakers, being able to walk around him, that's a GOOD thing.

"Bingo". Wow, that's incredible.