You are somewhat missing the point. There are more reasons than just raising the maximum frequency for sampling at higher than the Nyquist rate. For a start, errors caused by jitter and misreads are significantly (audibly reduced) - you can even get CD players that oversample normal CDs which decrease error distortion.
CDs are sampled at 44.1kHz. This means, theoretically, frequencies up to 22 kHz could be recorded, in practice the amount of precision required to record this is too difficult. So a higher sampling frequency gives more headroom before the theoretical highest frequency is reached.
Cables do make a difference. Poor cable attenuates the signal more at high frequencies. You need as good a conducting path as possible.
But you are right, in that that person was deluding themself - I don't think you would notice the difference with SACD unless you had just been listening to the same thing on CD. CD is pretty good.
a number of hacks could be discovered, and kept secret by some techie That's *exactly* why I wouldn't mind seeing the code open for public review...
Sorry what I meant was, there is the potential for hacks to be discovered by members of the public, and not put forward, which, if they are not spotted by anyone else, which is conceivable, could lead to huge abuse later...
It only needs to be good enough to sell copies in the current market to satisfy the corporate need.
Surely the corporate requirements are incredibly stringent here, the governments should be willing to pay as much money as necessary to the contractors to ensure security.
nuclear weapons and my country (NZ) don't mix... in fact nuclear anything and my country don't mix. It's quite funny, we have a super-shiny nuclear-free policy, i.e. you guys can't even bring nuclear powered ships here!
That is a good possibility. I'm not convinced of the value of releasing the code to the public to test though, as suggested in the article; a number of hacks could be discovered, and kept secret by some techie, and then used during the actual process. Perhaps they should just take more care when designing the actual product to make sure it's bulletproof - i.e. hire really good people to write the code. To my naive mind, this should not be too difficult to do
The work gone into designing the modulation schemes (FM, AM in particular) means receivers are easy to build and cheap, with acceptable SNR. I personally don't want to have to carry a computer around with me (talk about overkill) to listen to music, not to mention the annoyance of having to use broadband internet. mp3 (etc.) traffic is a veritable waste of bandwidth.
SW radio can be received in a large proportion of the world.
Sometimes I don't want to have to choose what music I listen to, and I get a good variety of music from local radio stations (well some of them), most of which I wouldn't otherwise listen to.
Why should we stop using the air as a communications channel? It's much cheaper than broadband cables or satellites.
Quantum Computing has huge potential, algorithms such as Shor's factorisation algorithm and Quantum error-correcting codes have been developed and are just waiting for the hardware... I'm pretty sure I read somewhere (can't remember where - maybe Electronics World) that quantum logic gates have been created in a lab under controlled conditions, so who knows when it will become large scale?
That said, quantum computers are not necessarily better at everything or infinitely powerful as some people seem to think...
Quantum cryptography is alive and well already, scientists in Germany have managed to transmit entangled photons over the river Danube through air, and conventional quantum cryptography (without entanglement) has been done over many kms (22km I think) through air.
But how satisfying would it be to have built your own spaceship!! It's just like the masses of us who like to build our own radios/computers/gizmos/whatever. This is like the perfect excuse for the D.I.Y. project of a lifetime!
It says on the website that he uses pressure-treated yellow pine. If you read his resume it sounds like he knows what he's talking about - of course he does, he's an engineer!
Yeah, a testament to how upside-down the Japanese economy is. My Japanese friend bought me a cellphone with built in camera for 1 Yen (about 1c), on a no-obligation, opt-out anytime contract over the summer (winter for you Americans).
lol - basically that anything NASA tells is rubbish, that we're being kept in the dark about everything, that a comet passing within a million miles of us will kill us all, stuff like that...
I met a guy the other night who quit his job to look into this stuff, he's pretty convinced that the world will end soon! that's why I posted it because it reminded me of that conversation
Well, according to this guy NASA are hiding all the interesting ones from us... the end is nigh!!
Re:Numbers at right angles to each other
on
Imagining Numbers
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· Score: 1
The use of complex numbers in electrical engineering is simply to reduce the tedium involved in the math, because an exponential e^(jwt) is so much easier to deal with than a trig function cos(wt).
j (i) doesn't actually mean anything to us, it's just a convenient invention.
So we pretend our input, cos(wt) is actually an exponential e^(jwt) (which is cos(wt) + jsin(wt) anyway), and then do our analysis on that using differential equations, which with an exponential input is absurdly easy. Then we throw away any complex parts (which didn't exist anyway) at the end to get the answer we were after in the first place.
This of course is for linear circuits only (with inductors, resistors, capacitors) and relies on superposition.
Does it really matter what software he uses? I think that the robot itself is the only interesting thing, not which software he uses to model it...
It's like me running a story on how I wrote my latest software project in C. wow
Whether or not he was a mathematical genius remains to be seen, but his music has regular swells every thirty seconds, which [apparently] has been proven to temporarily increase the iq of listeners. Mozart makes you smart:)
btw Philip Glass came out on the bottom of that study.
Slashdot Mirror
Babbage's Difference Engine *just* misses the cut on the 'fits in a shoebox' criterion
Yup, sure is slow - 0.8 seconds to startup vs about 0.5 for IE6 (Athlon XP2600+). I think I might have to switch back to IE6
It's for a 100-digit number whose13th root is an integer. Read the rules about how it works here
CDs are sampled at 44.1kHz. This means, theoretically, frequencies up to 22 kHz could be recorded, in practice the amount of precision required to record this is too difficult. So a higher sampling frequency gives more headroom before the theoretical highest frequency is reached.
Cables do make a difference. Poor cable attenuates the signal more at high frequencies. You need as good a conducting path as possible.
But you are right, in that that person was deluding themself - I don't think you would notice the difference with SACD unless you had just been listening to the same thing on CD. CD is pretty good.
lol, yeah that's the one
what?
That's *exactly* why I wouldn't mind seeing the code open for public review...
Sorry what I meant was, there is the potential for hacks to be discovered by members of the public, and not put forward, which, if they are not spotted by anyone else, which is conceivable, could lead to huge abuse later
It only needs to be good enough to sell copies in the current market to satisfy the corporate need.
Surely the corporate requirements are incredibly stringent here, the governments should be willing to pay as much money as necessary to the contractors to ensure security.
Vote by slashdot poll! Ah always wahnted tuh see cowboah neal in governimint
Heh heh heh. maybe the country should gather in the primary schools and vote by show of hands. Then we'd get a really good laugh over here.
nuclear weapons and my country (NZ) don't mix ... in fact nuclear anything and my country don't mix. It's quite funny, we have a super-shiny nuclear-free policy, i.e. you guys can't even bring nuclear powered ships here!
That is a good possibility. I'm not convinced of the value of releasing the code to the public to test though, as suggested in the article; a number of hacks could be discovered, and kept secret by some techie, and then used during the actual process. Perhaps they should just take more care when designing the actual product to make sure it's bulletproof - i.e. hire really good people to write the code. To my naive mind, this should not be too difficult to do
How do you "accidentally" put software on a public FTP server ... this is ridiculous. Makes me glad to not be an American :)
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The work gone into designing the modulation schemes (FM, AM in particular) means receivers are easy to build and cheap, with acceptable SNR. I personally don't want to have to carry a computer around with me (talk about overkill) to listen to music, not to mention the annoyance of having to use broadband internet. mp3 (etc.) traffic is a veritable waste of bandwidth.
- SW radio can be received in a large proportion of the world.
- Sometimes I don't want to have to choose what music I listen to, and I get a good variety of music from local radio stations (well some of them), most of which I wouldn't otherwise listen to.
-
Why should we stop using the air as a communications channel? It's much cheaper than broadband cables or satellites.
Rant overAnd I saw it on the front page of The Press this morning (in Christchurch, NZ, it is now 11pm)
Quantum Computing has huge potential, algorithms such as Shor's factorisation algorithm and Quantum error-correcting codes have been developed and are just waiting for the hardware ... I'm pretty sure I read somewhere (can't remember where - maybe Electronics World) that quantum logic gates have been created in a lab under controlled conditions, so who knows when it will become large scale?
That said, quantum computers are not necessarily better at everything or infinitely powerful as some people seem to think ...
Quantum cryptography is alive and well already, scientists in Germany have managed to transmit entangled photons over the river Danube through air, and conventional quantum cryptography (without entanglement) has been done over many kms (22km I think) through air.
ummm ... monday morning when?
But how satisfying would it be to have built your own spaceship!! It's just like the masses of us who like to build our own radios/computers/gizmos/whatever. This is like the perfect excuse for the D.I.Y. project of a lifetime!
How do you access the google cache of such things?The bandwidth limit has kicked in ...
It says on the website that he uses pressure-treated yellow pine. If you read his resume it sounds like he knows what he's talking about - of course he does, he's an engineer!
Yeah, a testament to how upside-down the Japanese economy is. My Japanese friend bought me a cellphone with built in camera for 1 Yen (about 1c), on a no-obligation, opt-out anytime contract over the summer (winter for you Americans).
lol - basically that anything NASA tells is rubbish, that we're being kept in the dark about everything, that a comet passing within a million miles of us will kill us all, stuff like that ...
I met a guy the other night who quit his job to look into this stuff, he's pretty convinced that the world will end soon! that's why I posted it because it reminded me of that conversation
Well, according to this guy NASA are hiding all the interesting ones from us ... the end is nigh!!
The use of complex numbers in electrical engineering is simply to reduce the tedium involved in the math, because an exponential e^(jwt) is so much easier to deal with than a trig function cos(wt).
j (i) doesn't actually mean anything to us, it's just a convenient invention.
So we pretend our input, cos(wt) is actually an exponential e^(jwt) (which is cos(wt) + jsin(wt) anyway), and then do our analysis on that using differential equations, which with an exponential input is absurdly easy. Then we throw away any complex parts (which didn't exist anyway) at the end to get the answer we were after in the first place.
This of course is for linear circuits only (with inductors, resistors, capacitors) and relies on superposition.
Does it really matter what software he uses? I think that the robot itself is the only interesting thing, not which software he uses to model it... It's like me running a story on how I wrote my latest software project in C. wow
Whether or not he was a mathematical genius remains to be seen, but his music has regular swells every thirty seconds, which [apparently] has been proven to temporarily increase the iq of listeners. Mozart makes you smart :)
btw Philip Glass came out on the bottom of that study.