Griffinator Posted July 5, 2003 Share Posted July 5, 2003 This is a little test for ya. in this zipfile http://www.soundwise.org/klipschubb/griffinator/Test%20waves.zip are two wave files, same duration, same sound. But are they the same? If not, what's the difference between the two? Post your answers here... PS: Don't just say you hear a difference if you don't. For all anyone knows, they're exactly the same... Quote Link to comment Share on other sites More sharing options...
Griffinator Posted July 5, 2003 Author Share Posted July 5, 2003 One more thing: No opening up in wave editors. LISTEN to the file, don't analyze it. Quote Link to comment Share on other sites More sharing options...
bkrop Posted July 5, 2003 Share Posted July 5, 2003 I need a 29.99 plug in to listen... Quote Link to comment Share on other sites More sharing options...
justin_tx_16 Posted July 5, 2003 Share Posted July 5, 2003 I could easily hear a difference. the first one is not as loud and does not go up at the same rate as the other... like... 1231 and 1234... hard to describe really the second one seems higher pitched in sound, but lower towards the end, likely to do with the volume difference which is very apparent. Quote Link to comment Share on other sites More sharing options...
Griffinator Posted July 5, 2003 Author Share Posted July 5, 2003 Anyone else care to guess what's wrong? No, there aren't any volume differences between the two. Quote Link to comment Share on other sites More sharing options...
Griffinator Posted July 5, 2003 Author Share Posted July 5, 2003 bk: Do you have a CD-burning utility? You could easily burn them to disc and throw them in your player. They're standard 16/44.1 files. Quote Link to comment Share on other sites More sharing options...
Flason Posted July 5, 2003 Share Posted July 5, 2003 Test tone 2 rattled the wall hangings more than test tone 1. Although having the same volume, there seemed to be "overtones" (I don't know if that's the right terminology) on #2. Quote Link to comment Share on other sites More sharing options...
Griffinator Posted July 5, 2003 Author Share Posted July 5, 2003 Now we're getting somewhere You're warm, very very warm. Anyone else care to venture? Quote Link to comment Share on other sites More sharing options...
sunnysal Posted July 5, 2003 Share Posted July 5, 2003 well I listened on my com´puter not on my stereo but the first tone sounded rougher, more squarewavey and the second sounded smoother more sinewavey...the second was mellower...would the second have less odd order overtones?..or more even order overtones? what is the difference? tony Quote Link to comment Share on other sites More sharing options...
NOSValves Posted July 5, 2003 Share Posted July 5, 2003 Test tone 2 has more reverb !! Quote Link to comment Share on other sites More sharing options...
Griffinator Posted July 5, 2003 Author Share Posted July 5, 2003 Tony, Craig, sorry. No dice. Nothing was added to (or subtracted from) the wave form (although you have to wonder, which was the original?) Anyone else? Quote Link to comment Share on other sites More sharing options...
NOSValves Posted July 5, 2003 Share Posted July 5, 2003 Griff, Something has had to be done to one or the other there is just no comparision to the to files. At the very least one is at a higher volume or reaches a lower Hz !! Quote Link to comment Share on other sites More sharing options...
justin_tx_16 Posted July 5, 2003 Share Posted July 5, 2003 no really, the first one is louder. If i coudl video tape my EQ Vis. in WinAmp you could see that the first has a much lower amplitude. Quote Link to comment Share on other sites More sharing options...
prodj101 Posted July 5, 2003 Share Posted July 5, 2003 in the first one, each tone is seperate, in the 2nd, they overlay eachother, like the 1st one continues to play after the rest come in. Quote Link to comment Share on other sites More sharing options...
Griffinator Posted July 5, 2003 Author Share Posted July 5, 2003 Craig - I didn't say nothing was done, I said nothing was added to or subtracted from. That's cool, though. I'll spill the beans. The second file is the original recorded sample. The first file was altered. How? I time-shifted the left channel by 5 ms. Demonstration of what phase-cancellation does to your audio (which is why, Justin, everything sounded louder in the second example, when in fact the two were of identical amplitude. In a little bit, I'll post the frequency analysis of each waveform so you can see what exactly a slight delay (that can easily be caused by uneven speaker wire lengths, actually) can do to your signal. There is a demonstrable difference even as slight as a 1ms delay (I will show analysis to prove this) - but once you get down to .5ms, I am quite certain that the difference is so subtle as to be inaudible (got a snapshot of that one too) Quote Link to comment Share on other sites More sharing options...
Parrot Posted July 5, 2003 Share Posted July 5, 2003 Griffinator, I didn't listen to your test, sorry, just didn't want to bother with a zip file. However, there is no way in the world that a comparable effect would occur with unequal speaker wire lengths. Quote Link to comment Share on other sites More sharing options...
sunnysal Posted July 5, 2003 Share Posted July 5, 2003 thanks griffinator, fun test. good to know that 5ms can be heard...the second sounded much better than the first. I do wonder how much mire you need to cause a 5ms delay or how far apart drivers need to be to cause it...pretty darn far methinks! tony Quote Link to comment Share on other sites More sharing options...
Griffinator Posted July 5, 2003 Author Share Posted July 5, 2003 ---------------- On 7/5/2003 4:02:04 PM paulparrot wrote: Griffinator, I didn't listen to your test, sorry, just didn't want to bother with a zip file. However, there is no way in the world that a comparable effect would occur with unequal speaker wire lengths. ---------------- Actually, Paul, it depends on the quality of the wire. Think for a moment about a really large room with in-wall wiring to the back speakers. Suppose the amp is located on one side wall, and as a result the wire run to the opposite side rear speaker is an additional 20 feet. 5 milliseconds is not an unreasonable amount of delay in that situation. As I'll prove in my next post, even 1 millisecond between left and right channels can cause an appreciable difference in the sound. Quote Link to comment Share on other sites More sharing options...
Griffinator Posted July 5, 2003 Author Share Posted July 5, 2003 Darnit. Justin - mind if I e-mail you a few jpegs? I can't seem to upload anything to the board here lately. Quote Link to comment Share on other sites More sharing options...
marksdad Posted July 5, 2003 Share Posted July 5, 2003 justin how goes the dope from hope cd progress? e mail me please? Quote Link to comment Share on other sites More sharing options...
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