...and if you read the specs from the manufacturers website, they also list 285, 300 and 345 in various places
Actually the older model had 300 mics. Currently Squarehead makes small 225 mic array, a medium 285 mic array and a large 345 mic array. The largest array has a diameter of 2.12m (about 7 feet) and the smallest 1.05m (about 3.5 feet). Audio zoom is available both realtime and in replay as all channels can be stored.
anyway, the desktop machines and servers today dont really care that much about which threading api they use, but in stuff like cellphones, palm handhelds and other quite slow operating devices that dont have a common threading interface, this is a quite good solution.
While your argument concerning cellphones certainly has been valid historically, todays devices are actually very capable. I work with cellphone software and I found myself beeing suprised e.g by the performance of J2ME on modern phones. My experience is with symbian (c/c++) and J2ME. Symbian OS encourages use of cooperative multitasking though its "active objects"-pattern to eliminate some of the overhead of real threads. However using J2ME yields almost the same performance without having to deal with all the "performance optimizing" tricks of Symbian C++ (such as active objects, descriptors instead of strings and manual memory (de)allocation). (It is possible that this is due to java-optimized hardware in the phones, we have tested new Sony Ericssons and high-end Nokias, but who cares it works very well)
When high level languages/platforms like Java can successfully be used even on cellphones, its is time for C++ to die as language for application developement. The only obstacle, as I see it, is that the two promising platforms (Java and.NET) are properitary and subject to market power struggles. So we are sadly probably stuck with C++ hell for years to come yet.
I use this script to hide ads in Opera until i click them.
Not quite as smooth as the Firefox flashblock plugin, but opera has many other nice features, and has been my preferred windows browser since the aniversary giveaway. At home however I have a Powerbook, and uses Pithhelmet to kill the ads.
The Holux GM-210 GPS reciever should be about 100$, guessing from the price here in Norway. (There is also an battery driven bluetooth variant, but it is twice the price) You can even buy an USB cable and avoid all RS232 hacking, and there seems to be Linux drivers at their homepage. I haven't tried it though.
I realize of course that you are just making a joke. But the name is probably carfully chosen. Aside from Dirac being an important British physicist, the dirac delta function is a central element in signal processing theory. The dirac delta, normally denoted as a lowercase greek delta character, is defined as a pulse which integral is equal to 1. In addition the pulse duration approaches zero. For time descrete signal processing systems the dirac function is simply a unit value at time = 0.
One important quality of the dirac function is that is contains a flat frequency spectrum. Given a causal, time invariant linear signal processing system (which most are, to an extent anyway), the response from an applied dirac pulse givs us the (unit-)pulse resonse. This response is the inverse fourier transform of the transfer function of the system, describing the systems behavior at any frequency.
Of course it is not possible to apply a dirac pulse to any analog system such as an audio ampifier, as it is infinatly high and short. In the digital world however it is simply a single unit value, and the unit-pulse response is easily obtained.
It is probably not a coincident that the d in the dirac logo is replaced by the greek delta letter used to denote the dirac delta function.
There is a digital stage at the heart of the Class D technology (which makes them incredibly efficient) but that signal is not comparable to PCM or other digital audio encodings.
The boundary between digtal and analog circuits are somewhat blurred, as definitions may vary. But a classic class-D amplifier design is in my opinion an analog system. I can be built with classical analog blocks such as a comparator comparing the input signal to a sawtooth pulse with frequency outside the passband. The output will be a pulse width modulated signal which is easily amplified since the transistors is only used in "off" and "on" state. A low pass filter with good power handling passes an amplified version of the input signal at the output.
Even though it might be possible, and probably sometimes desierable, to use digital blocks to generate the internal PWM signal this is not an inherent feature of a class-d amp design.
Sorry for parent post... to early submission, it happens to everyone. really...
Because both XAML and iTMS XML mix content with presentation, neither is a good replacement for html+css, but both are interesting none-the-less.
Separating content and presentation is a very good idea. However at some point it will be mixed, at least on screen. I think that separation on the server side is better to avoid client complexity. I.e. with a XSLT based solution as seen in Apache Cocoon.
Apple probably just added the trailers to iTMS because it was an easy addition to the feature list. It may however be an opening for movie distribution via iTMS (or iCinema or iWhatever)
Mr. Jobs has previosly denied that internet movie sales was something for Apple. But it should certainly be possible, there is certainly an emerging market, and if anyone could do it at this time, it would be Apple. They already have a customer base, payment solution, Quicktime and Jobs is well connected in the movie business.
I realize that you are only trying to be funny, but it might not be coincidental that norwegians does this. That's because that's the way it's done in the Norwegian language. Most expressions of that kind is concatenated to a new word in norwegian. This of course causes some problems using the Word spell checker (which in norwegian is one word;-P) on norwegian texts.
Will some native German please help me out if I am wrong? Isn't uber meant more for position/location of something? Ie it might mean above, but that refers to position, not necessarily quality or "the best of the best"
I would think that it could mean both. IIRC Adolf Hitler refered to the people he viewed superior as "ubermenchen". I pretty sure he did not refer to posistion in that context.
On the subject securing optical links, quantum crypto is an interesting aproach. It is not useful to transmit a lot of data, but can be used in secure key interchange.
Most drivers do NOTHING that justifies keeping the code under lock like it is done today.
Though i think that these drivers should be opensource, this statement is simply not correct. Doing optimized HW/SW partitioning is a diffcult task. This is actually a relativly new dicipine in digital design, SW/HW codesign. The designer has to place the functions in either the SW or the HW domain, and optimize on performance and cost. Making correct choices in this phase make a huge difference in the final product.
It seem clear to me now: Americans automatically thinks force is the solution to any problem. Like bombing random countries in a "war on terrorism". Suing kids for downloading music instead of trying to sell them downloadable music. Making laws like DMCA which makes the legal department the most important entity in technology firms. And many of them actually thinks that owning automatic weapons is a human-right.
You make a valid point about Apple. I however have an alternative strategy: Whenever sombody asks me which computer they should buy, I usually recomend: none. "Don't buy a computer, it will be mostly trouble" I say, of course not in a very seriuos tone, but I mean i to some extent.
Computers still aren't easy enough for everybody to maintain. Sure using them when they are correctly set up is easy for most people. But maintaining a computer set-up, installing new software, keep it up-to-date and fixing problems still is for people who have a clue. This even applies to Apple's machines, but they are probably the best in the class.
It should also be mentioned that the Norwegian "FCC" set up a website were customers can compare prices. You just enter in how much you call, approximatly when and how many SMS's you use per month, and you get a list of the providers which is cheapest.
This, together with number portability, has really benefitted the cutomers. It should be an example for other contries to follow. It's actually a bit shocking to see the government doing something right for a change. Especially something so "technical" as regulating telecom.
What is missing much of the time is honest labelling. At download.com, much of what is called "free" or "freeware" is really crippleware.
That is a valid point, but it is however not open source software you are refering to. The post was talking about the "Open source community" and if you search Freshmeat instead of Download.com you will find a quite different result. Let's not confuse OSS with the crippled spyware you find at Download.com.
Ah, I'm just a dumb guitarist. With guitar amps, I've always heard it refered to as the maximum load before signal distortion begins to occur. The two might be related, or I might just have been mislead. =)
There will always be some distortion. The value to look for is THD which states the total harmonic distortion i percent (at some power value). When a system isn't perfectly linear (which no physical system is) in responce it will add unwantet harmonic components. THD is the power of the unwantetd components to the power of the signal.
If the RMS power value is combined with some value for THD at that power which is below say 1-2% you are right, because distortion below 2% is hard to hear.
There might be some standard way to specify RMS values which implies some THD value, but i wouldt trust that blindly.
basically think of it as how loud you can crank them before the signal starts to distort
Actually RMS = Root Mean Square. Usually one would see time variant voltages and currents given in RMS values or amplitude value. The RMS value is the DC value that would yeild the same powerdissipation in an ohmic load as the time variant signal does. For pure harmonic signals the RMS value is A/sqrt(2) where A is the amplitude value. RMS has noting to do with distortion, but simply denotes the power that would be dissipated in a pure ohmic load.
The speaker and amp manufacturers are very creative when it comes to power values, and you should be more critical that just looking for the three letters RMS.
... at least until some vendor provides mathematical sofware for the PDA.
The software in todays calculators are capable of pretty advanced mathematical opererations, including advanced calculus, matix operations, statisics and complex math. Until sombody creates an equally good mathematics software suit for PDA's these things will still be around.
Another thing is QA. How are we to be sure that some program we downloaded to our PDA does the calculations correctly. When you buy an advanced calculator you can be pretty confident that the different mathematical functions has been thoroughly tested. Since the key sellingpoint of a calculator is the ability to, well, calculate, the vendor has probably gone to some effort to ensure that it is infact capable of doing that correctly.
Slashdot Mirror
...and if you read the specs from the manufacturers website, they also list 285, 300 and 345 in various places
Actually the older model had 300 mics. Currently Squarehead makes small 225 mic array, a medium 285 mic array and a large 345 mic array. The largest array has a diameter of 2.12m (about 7 feet) and the smallest 1.05m (about 3.5 feet). Audio zoom is available both realtime and in replay as all channels can be stored.
And yes, it does run on Linux (and Mac OS X)
J
Software Engineer @ Squarehead Technology
anyway, the desktop machines and servers today dont really care that much about which threading api they use, but in stuff like cellphones, palm handhelds and other quite slow operating devices that dont have a common threading interface, this is a quite good solution.
.NET) are properitary and subject to market power struggles. So we are sadly probably stuck with C++ hell for years to come yet.
While your argument concerning cellphones certainly has been valid historically, todays devices are actually very capable. I work with cellphone software and I found myself beeing suprised e.g by the performance of J2ME on modern phones. My experience is with symbian (c/c++) and J2ME. Symbian OS encourages use of cooperative multitasking though its "active objects"-pattern to eliminate some of the overhead of real threads. However using J2ME yields almost the same performance without having to deal with all the "performance optimizing" tricks of Symbian C++ (such as active objects, descriptors instead of strings and manual memory (de)allocation). (It is possible that this is due to java-optimized hardware in the phones, we have tested new Sony Ericssons and high-end Nokias, but who cares it works very well)
When high level languages/platforms like Java can successfully be used even on cellphones, its is time for C++ to die as language for application developement. The only obstacle, as I see it, is that the two promising platforms (Java and
I use this script to hide ads in Opera until i click them.
Not quite as smooth as the Firefox flashblock plugin, but opera has many other nice features, and has been my preferred windows browser since the aniversary giveaway. At home however I have a Powerbook, and uses Pithhelmet to kill the ads.
The Holux GM-210 GPS reciever should be about 100$, guessing from the price here in Norway. (There is also an battery driven bluetooth variant, but it is twice the price) You can even buy an USB cable and avoid all RS232 hacking, and there seems to be Linux drivers at their homepage. I haven't tried it though.
Have anyone sucessfully used this GPS reciever?
I realize of course that you are just making a joke. But the name is probably carfully chosen. Aside from Dirac being an important British physicist, the dirac delta function is a central element in signal processing theory. The dirac delta, normally denoted as a lowercase greek delta character, is defined as a pulse which integral is equal to 1. In addition the pulse duration approaches zero. For time descrete signal processing systems the dirac function is simply a unit value at time = 0.
One important quality of the dirac function is that is contains a flat frequency spectrum. Given a causal, time invariant linear signal processing system (which most are, to an extent anyway), the response from an applied dirac pulse givs us the (unit-)pulse resonse. This response is the inverse fourier transform of the transfer function of the system, describing the systems behavior at any frequency.
Of course it is not possible to apply a dirac pulse to any analog system such as an audio ampifier, as it is infinatly high and short. In the digital world however it is simply a single unit value, and the unit-pulse response is easily obtained.
It is probably not a coincident that the d in the dirac logo is replaced by the greek delta letter used to denote the dirac delta function.
There is a digital stage at the heart of the Class D technology (which makes them incredibly efficient) but that signal is not comparable to PCM or other digital audio encodings.
The boundary between digtal and analog circuits are somewhat blurred, as definitions may vary. But a classic class-D amplifier design is in my opinion an analog system. I can be built with classical analog blocks such as a comparator comparing the input signal to a sawtooth pulse with frequency outside the passband. The output will be a pulse width modulated signal which is easily amplified since the transistors is only used in "off" and "on" state. A low pass filter with good power handling passes an amplified version of the input signal at the output.
Even though it might be possible, and probably sometimes desierable, to use digital blocks to generate the internal PWM signal this is not an inherent feature of a class-d amp design.
-dill
MSc, analog/mixed signal electronics design
I can use nohup to start a lengthy process from a remote ssh session, hang up, and check on it later.
/dev/st0 / " | at now
The same can be acomplished using "atd" and secheduelling the job for "now". The advantage is that the output is mailed to you when its done.
example:
# echo "tar cf
I'v often used this to run backups that failed for som reason during the cron task.
Another tip: If you have access to run at-jobs, but not cron-jobs, jou can make a shell script that rescheduels itself with at when it is executed.
Sorry for parent post... to early submission, it happens to everyone. really...
Because both XAML and iTMS XML mix content with presentation, neither is a good replacement for html+css, but both are interesting none-the-less.
Separating content and presentation is a very good idea. However at some point it will be mixed, at least on screen. I think that separation on the server side is better to avoid client complexity. I.e. with a XSLT based solution as seen in Apache Cocoon.
Apple probably just added the trailers to iTMS because it was an easy addition to the feature list. It may however be an opening for movie distribution via iTMS (or iCinema or iWhatever)
Mr. Jobs has previosly denied that internet movie sales was something for Apple. But it should certainly be possible, there is certainly an emerging market, and if anyone could do it at this time, it would be Apple. They already have a customer base, payment solution, Quicktime and Jobs is well connected in the movie business.
Just speculating of course...
That was actually the first thing they installed when they rebooted Iraq.
Whyis itthat theNorwegians liketo squishwords together?
;-P) on norwegian texts.
I realize that you are only trying to be funny, but it might not be coincidental that norwegians does this.
That's because that's the way it's done in the Norwegian language. Most expressions of that kind is concatenated to a new word in norwegian. This of course causes some problems using the Word spell checker (which in norwegian is one word
Norwegianelectronicsstudent
Will some native German please help me out if I am wrong? Isn't uber meant more for position/location of something? Ie it might mean above, but that refers to position, not necessarily quality or "the best of the best"
I would think that it could mean both. IIRC Adolf Hitler refered to the people he viewed superior as "ubermenchen". I pretty sure he did not refer to posistion in that context.
On the subject securing optical links, quantum crypto is an interesting aproach. It is not useful to transmit a lot of data, but can be used in secure key interchange.
More on this:
here
here
and here
Most drivers do NOTHING that justifies keeping the code under lock like it is done today.
Though i think that these drivers should be opensource, this statement is simply not correct. Doing optimized HW/SW partitioning is a diffcult task. This is actually a relativly new dicipine in digital design, SW/HW codesign. The designer has to place the functions in either the SW or the HW domain, and optimize on performance and cost. Making correct choices in this phase make a huge difference in the final product.
...americans approach to problem solving.
It seem clear to me now: Americans automatically thinks force is the solution to any problem. Like bombing random countries in a "war on terrorism". Suing kids for downloading music instead of trying to sell them downloadable music. Making laws like DMCA which makes the legal department the most important entity in technology firms. And many of them actually thinks that owning automatic weapons is a human-right.
Here's a hint: force != solution
Wow, imagine a beowulf cluster of these!
You make a valid point about Apple. I however have an alternative strategy: Whenever sombody asks me which computer they should buy, I usually recomend: none. "Don't buy a computer, it will be mostly trouble" I say, of course not in a very seriuos tone, but I mean i to some extent.
Computers still aren't easy enough for everybody to maintain. Sure using them when they are correctly set up is easy for most people. But maintaining a computer set-up, installing new software, keep it up-to-date and fixing problems still is for people who have a clue. This even applies to Apple's machines, but they are probably the best in the class.
Isn't R/C short for radio controlled. Is it suppsed to be a radio controlled controlled car? (the control-unit itself is radio controlled perhaps)
Pardon me for conTrolling
It should also be mentioned that the Norwegian "FCC" set up a website were customers can compare prices. You just enter in how much you call, approximatly when and how many SMS's you use per month, and you get a list of the providers which is cheapest.
This, together with number portability, has really benefitted the cutomers. It should be an example for other contries to follow. It's actually a bit shocking to see the government doing something right for a change. Especially something so "technical" as regulating telecom.
What is missing much of the time is honest labelling. At download.com, much of what is called "free" or "freeware" is really crippleware.
That is a valid point, but it is however not open source software you are refering to. The post was talking about the "Open source community" and if you search Freshmeat instead of Download.com you will find a quite different result. Let's not confuse OSS with the crippled spyware you find at Download.com.
Ah, I'm just a dumb guitarist. With guitar amps, I've always heard it refered to as the maximum load before signal distortion begins to occur. The two might be related, or I might just have been mislead. =)
There will always be some distortion. The value to look for is THD which states the total harmonic distortion i percent (at some power value). When a system isn't perfectly linear (which no physical system is) in responce it will add unwantet harmonic components. THD is the power of the unwantetd components to the power of the signal.
If the RMS power value is combined with some value for THD at that power which is below say 1-2% you are right, because distortion below 2% is hard to hear.
There might be some standard way to specify RMS values which implies some THD value, but i wouldt trust that blindly.
basically think of it as how loud you can crank them before the signal starts to distort
Actually RMS = Root Mean Square. Usually one would see time variant voltages and currents given in RMS values or amplitude value. The RMS value is the DC value that would yeild the same powerdissipation in an ohmic load as the time variant signal does. For pure harmonic signals the RMS value is A/sqrt(2) where A is the amplitude value. RMS has noting to do with distortion, but simply denotes the power that would be dissipated in a pure ohmic load.
The speaker and amp manufacturers are very creative when it comes to power values, and you should be more critical that just looking for the three letters RMS.
... at least until some vendor provides mathematical sofware for the PDA.
The software in todays calculators are capable of pretty advanced mathematical opererations, including advanced calculus, matix operations, statisics and complex math. Until sombody creates an equally good mathematics software suit for PDA's these things will still be around.
Another thing is QA. How are we to be sure that some program we downloaded to our PDA does the calculations correctly. When you buy an advanced calculator you can be pretty confident that the different mathematical functions has been thoroughly tested. Since the key sellingpoint of a calculator is the ability to, well, calculate, the vendor has probably gone to some effort to ensure that it is infact capable of doing that correctly.
Site down for maintainence, sorry for the inconvenience
Google has better uptime.