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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Doppler distortion and sonic holography. posted by Charles on August 6, 1999 at 01:38:50:
Hi Charles,...on how Dr Kimber has implemented the technology. Removing Doppler content from music would be wrong (as you suggest). But removing additive Doppler distortion caused by loudspeakers should be perfectly OK.
>> I really would hate to see folks flocking to this new technology only to have it wear thin in short order. Equipment is too expensive for such short excursions, and I think most of us are better off without them. If you want to play with this technology, and enjoy it's qualities, that's fine with me, because it will most surely be DIFFERENT, but please don't buy off on the argument that it is actually an improvement in accuracy. It isn't. Even if I have most of this wrong the hard fact remains that Doppler shift DOES exist when a single instrument produces multipal tones from a single sounding board. Removing this natural effect from the sound will make it different, but is WILL be less true to the original. <<
Before being critical of the effects of the technology I think it would be worthwhile to understand its principles of operation and how it is actually implemented. The results would be very different between a. changing the musical signal i.e what is fundamentally coming off the CD or LP by subtracting something from the signal and b. simply adjusting the signal to compensate for some known physical defect in the replay chain, similar to RIAA equalization for example.
If the latter method is used, the signal will be corrected for the speakers' injection of Doppler distortion (an addition to the signal) but the original piano Doppler content (an integral part of the musical signal) will be left intact. I imagine this is how it will work.
And if this is true, each implementation will be individually tailored to the specific loudspeaker, as a 2-way model (with large cone excursion and wide driver frequency range) will have a far greater problem with Doppler distortion than will a very efficient multi-driver loudspeaker with much smaller cone displacement and narrower frequency bands. I imagine the technology will be implemented as an integral part of the LS x-over but I'm guessing now.
When done properly, correcting a loudspeaker's Doppler distortion should have absolutely no affect on the Doppler content of the original signal, as follows:
Original signal (including Doppler content) + Speaker Doppler distortion = distorted signal (The problem)
Original signal - Doppler content - Speaker Doppler distortion = distorted signal (Your supposition on how the problem is addressed)
Original signal (including Doppler content) - Speaker Doppler distortion = undistorted signal (The probable solution)
>>It is indeed Dr. Kimber's recent assertions that prompted my post. As I understand it, he is currently licensing the technology to several speaker manufacturers. I don't have any idea how the good Doctor (is) performing his audio surgery, and don't really care. I just wanted to point out to everyone that such surgery would be removing a so-called distortion that really belongs there<<
Charles, you really should care how Dr Kimber is performing his audio surgery, because if he's done it properly, your last statement would be completely untrue.
As I've mentioned before on this site, criticism should be provided in the context of the design and its implementation, otherwise its just guesswork and/or 'disinformation'.
Interesting topic for discussion though. Someone should invite Dr Kimber to the Asylum to give us all the lowdown. Then we can have some meaningful dialog based on the facts.
Regards,
Steve
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Follow Ups
- Re: It all depends..... - Steve 05:02:23 08/07/99 (1)
- Concessions. - Charles 19:15:54 08/07/99 (0)
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