Guest " " Posted January 1, 2007 Share Posted January 1, 2007 I would think the way an ear percieves a square wave is rather mute, since something that merely approximates it is going to be heard differently...no? Sure, I played around with a mac program that could generate tones at requested frequencies as well as allowing you to select the type of wave...sine, square, and a few others. Totally different perception of sound. Quote Link to comment Share on other sites More sharing options...
Klewless Posted January 1, 2007 Share Posted January 1, 2007 The current issue of AudioXpress mag (January 2007) has an article by Steve Stokes, "A Unique Crossover Design with Waveform Fidelity". This article is about the Technics SB-7000 speaker around 1975 which used a version of the Kido-Yamanaka crossover, which was first described by Bunkichi Yamanaka of Matsushita Corp. (Panasonic) in 1967. This used a mid speaker (called the "Filler Driver") bridging the woofer/tweeter. This approach claims to be able reproduce square waves. An interesting read. There is only one crossover point in the system. All the above information came from the article and are not direct quotes. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted January 1, 2007 Share Posted January 1, 2007 The only speaker I know of that reproduced square waves was the Quad ESL-63. for their demo, they put a mike in between 2 speakers, hit it with a square wave, then reversed the polarity on one channel. The square wave disappeared from the scope. Quote Link to comment Share on other sites More sharing options...
m8o Posted January 1, 2007 Author Share Posted January 1, 2007 A perfect square wave requires an infinite number of harmonics: Actually, not totally. Both that statement and the animation are 1/2 right. The Square Wave "contains only [an infinite # of] odd integer harmonics." I read that above, saw the animation showing 'even' harmonics as well, but said to myself "I thought it was only odd". And surely enough, the Wiki article says the same (which I quoted). A hobby of mine many many years ago was to program AutoCAD in the built in AutoLisp and apply different levels of harmonics, even and/or odd, added and/or subtracted, where the coefficients mutiplied to every harmonic would follow any linear equation I programmed in, and would apply that to an oscillating mesh in the z-axis ... fun, and very pretty stuff. Quote Link to comment Share on other sites More sharing options...
m8o Posted January 1, 2007 Author Share Posted January 1, 2007 The current issue of AudioXpress mag (January 2007) has an article by Steve Stokes, "A Unique Crossover Design with Waveform Fidelity". This article is about the Technics SB-7000 speaker around 1975 which used a version of the Kido-Yamanaka crossover, which was first described by Bunkichi Yamanaka of Matsushita Corp. (Panasonic) in 1967. This used a mid speaker (called the "Filler Driver") bridging the woofer/tweeter. This approach claims to be able reproduce square waves. An interesting read. There is only one crossover point in the system. All the above information came from the article and are not direct quotes. Totally OT, but I luv this stuff so I'll persist. Is that the x-over design which uses a very narrow bandwidth filler driver of about 32 ohms or something like that? I was very intrigued by that when I read about it in the early 80's in the AES Journals. I didn't read [or know] there was an actual implemenetation of the theory. Thanx. I'll have to look for the current mag. Quote Link to comment Share on other sites More sharing options...
DrWho Posted January 2, 2007 Share Posted January 2, 2007 A perfect square wave requires an infinite number of harmonics: Actually, not totally. Both that statement and the animation are 1/2 right. The Square Wave "contains only [an infinite # of] odd integer harmonics." I read that above, saw the animation showing 'even' harmonics as well, but said to myself "I thought it was only odd". And surely enough, the Wiki article says the same (which I quoted).A hobby of mine many many years ago was to program AutoCAD in the built in AutoLisp and apply different levels of harmonics, even and/or odd, added and/or subtracted, where the coefficients mutiplied to every harmonic would follow any linear equation I programmed in, and would apply that to an oscillating mesh in the z-axis ... fun, and very pretty stuff. The animation is just showing the number as a quantity of harmonics - basically the k value in the equation. Quote Link to comment Share on other sites More sharing options...
meagain Posted January 2, 2007 Share Posted January 2, 2007 Pretty cool animated graphic there Who. I'm kind of impressed. Quote Link to comment Share on other sites More sharing options...
m8o Posted January 2, 2007 Author Share Posted January 2, 2007 lol ... not to take anything away from DrWho as I've been duely impressed by his knowledge in numerous threads and posts, but just click the link to the Wiki article .... Look familiar? [] Quote Link to comment Share on other sites More sharing options...
DrWho Posted January 2, 2007 Share Posted January 2, 2007 lol! I posted the images from the Wiki article for the lazy people (like myself) [] Quote Link to comment Share on other sites More sharing options...
darkside Posted January 5, 2007 Share Posted January 5, 2007 LOL 8000+ posts, I wouldn't call yourself that lazy.... Quote Link to comment Share on other sites More sharing options...
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