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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Bill Waslo’s comparator thingy posted by tomservo on January 7, 2007 at 07:22:03:
Tom,Many thanks for your kind words. I was getting pretty disappointed about how low the interest about this program seemed to be, and am glad to hear you got a chance to work with it. A few magazine reviewers have shown some interest, but not many DIYers or non-pro hifi people. Rather surprising, given all the verbage that goes around about audibility, cables and DBTs, I thought more people would be interested in hearing more than just opinions.
"As long as the slopes were the same, one could compare reactive parts like capacitors and inductors and such as well.
If you were to add a software hp or lp first order slope option to your source signal, one could directly compare capacitors and inductors against a “theory perfect†version of same. I would think speaker builders would find this valuable tool to audition crossover parts selection is mostly word of mouth."That's a pretty good idea, I may steal that one! I think it would have to have a way to either measure the response due to a capacitor/inductor, since the source and load impedances will affect what the rolloffs are. The little RTA analyzer control in there was intended for similar purposes - to help in matching responses when used with caps and inductors (by messing with load impedance or shunting extra caps to make the responses match). But it hadn't occurred to me to simulate a perfect cap or inductor circuit, that would let people compare the things against a perfect component. I could probably get what I needed by having the user tell the program whether it is a cap or inductor or cable being tested (and if it will be in shunt or series), and then measure with the RTA and PinkNoise and from that figure out what the cap/inductance is. Then use that to calculate the ideal expected effect. That could probably be done more accurately than matching two kinds of caps with trimmer potentiometers like I did in the Usage Example (described in the Help file).
I'm working on another addition to the program right now that will let you (losslessly) compress recorded or extracted Wav files and package groups of them together into one file, so they can be easily restored into the proper slots on the playback page of the DiffMaker program. That should make it easier to do online posting of result files, and will make it MUCH easier for people to listen to result files -- if DiffMaker is installed in the computer, they will be able to just download and double-click on the file's name in Windows Explorer and DiffMaker will start up automatically with the files de-compresses and ready for comparison by ear. I'm hoping this way of using it will make it less intimidating for non technical people to use, or for people unfamiliar with all the computer operations of loading files. I can also then hide that (kinda scary) settings screen for those who are only listening to result files, and don't need to setup for recordings or extractions.
I plan to put a special page on my website where people can download and/or post result files of DiffMaker tests for other to listen to. Then if someone is contemplating purchase of a tested audio product, they can first listen to what kind of difference they can expect to get for their $$.
Not totally decided yet (it's not just up to me), but I think the program will be made non-commercial and public domain (though not "Open Source" because much of the included code is adopted from the PRAXIS program, which IS commercial and proprietary).
So, anyway, thanks again, and feel free to tell anyone about it and where they can download it. A newer version should be up there in a week or so if all goes well.
Bill
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Follow Ups
- Re: Bill Waslo’s comparator thingy - bwaslo 08:37:02 01/07/07 (2)
- It Is a Nice Concept..... - Todd Krieger 15:59:44 01/07/07 (0)
- Wow, thanks I hadn't seen this - Russ57 10:03:57 01/07/07 (0)
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