Search found 17 matches

by orbik
Sat Mar 29, 2014 3:27 pm UTC
Forum: Logic Puzzles
Topic: A very unconventional solution to the world’s most difficult
Replies: 27
Views: 8812

Re: A very unconventional solution to the world’s most diffi

The blog solution violates the puzzle rules. Asking "which of the following would you choose" is not a yes-or-no question. You could just as well ask "If 'ja' means red and 'da' means green, what is your favorite color?" Could you force True's favorite color to be red or green by...
by orbik
Wed Mar 26, 2014 9:25 pm UTC
Forum: Logic Puzzles
Topic: The ambiguous clock
Replies: 4
Views: 3985

Re: The ambiguous clock

I checked out the old thread linked to by Demki, and no one had the correct answer of 242 . The questions are different though. This one asks how many times (A) the hands are indistinguishable, the other one how many times (B) you won't be able to tell the time. If C means how many times the hands o...
by orbik
Wed Mar 05, 2014 4:09 pm UTC
Forum: What If?
Topic: What-If 0085: "Rocket Golf"
Replies: 52
Views: 16523

Re: What-If 0085: "Rocket Golf"

Olaf Klischat is correct -- for almost all configurations discussed, the escape velocity of the ship is greater than the launch velocity of the ball, so it will simply fall back to the surface of the ship after launch, and (assuming collisions are at least partially inelastic and it eventually come...
by orbik
Thu Dec 26, 2013 2:11 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1308: "Christmas Lights"
Replies: 42
Views: 19839

Re: 1308: "Christmas Lights"

I don't know where Munro got his fire spectrum; it seems very idealized. Googling for for 'infrared spectrum of a wood fire' gives a lot of spectra, none as simple as his. Wikipedia has this. Even accounting for the fact that the spectrum is flipped in direction compared to Munro's, its not a good ...
by orbik
Fri Aug 05, 2011 3:13 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0934: "Mac/PC"
Replies: 157
Views: 36091

Re: 0934: "Mac/PC"

Does using a browser really hide the differences? I can think of a few counterexamples. 1. Keyboard conventions differ. Windows, Linux and others use mostly consistent, predictable keyboard shortcuts. Except on a Mac. Telling a Safari user to F5 a web page leads to nothing but confusion. 2. Font ren...
by orbik
Thu Feb 03, 2011 3:10 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0855: "1999"
Replies: 111
Views: 41618

Re: 0855: "1999"

Might be a little off-topic, but I can't help being annoyed by the obvious gamma error in the downscaled image, especially the white-on-black text looks ugly. I thought technically minded people like Mr. Munroe should know better. A relevant article: http://www.4p8.com/eric.brasseur/gamma.html
by orbik
Tue Jan 11, 2011 4:51 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

According to this random test on the internet , I can hear 22k. Do you really think that what you hear in the 22k example is actually a pure 22k tone? Apart from having [at least on my firefox flash player] blatantly lower frequency components, try to record it, from your speakers, and do a quick s...
by orbik
Sun Jan 09, 2011 11:40 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

Schadenfreude wrote:ehhh. it's not actually 44.1kHz. it's 44100 samples per second. ... A file with 44100 samples/second can do at best about 22kHz.

Uh, Hz is just a synonym for once per second. With a sampling frequency of 44.1 kHz, the maximum signal bandwidth is 22.05 kHz.
by orbik
Sun Jan 09, 2011 9:28 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

I'd bet that even the synths you mentioned generated the square and sawtooth waves using a composition of sines. However, I'm not sure that synths actually use fourrier transforms to generate sine waves. Fourier transforms are very CPU intensive and tend to generate weird shapes at the edges of the...
by orbik
Sat Jan 08, 2011 9:21 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

Saying that "The human voice ranges from 300 to 4000 Hz, roughly" sounds arbitrary. I believe it's the empirically determined range necessary to retain intelligibility of speech, and most of it is to distinguish between formants and the slight differences between say, the impulses after &...
by orbik
Sat Jan 08, 2011 9:04 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

I have done blind tests for my own amusement and found that, keeping everything else in my system the same, I can hear the difference between a non-oversampling 16-bit/44.1kHz DAC and an oversampling 24-bit/96kHz one. What's this supposed to signify? Obviously you didn't feed them the same input an...
by orbik
Thu Jan 06, 2011 1:23 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

My two cents on the "people can't hear the difference between CDs and music encoded at a higher resolution" argument, from the point of view of someone who's both an audiophile and an empiricist: A lot depends on the rest of the signal path. I'm not talking about $1,000 speaker-cable vood...
by orbik
Mon Jan 03, 2011 1:01 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

DVD audio and SACD are obviously superior... Obviously superior in what sense? Bandwidth of ultrasonic frequencies? Most likely the inaudible band is filtered out in mixing anyway, so there's no additional frequency content. Technically of course, increased sampling rate allows an even flatter freq...
by orbik
Mon Jan 03, 2011 3:38 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

The higher sample rates may be useful for non-human applications. That is why electronic amplifiers should really filter frequencies they are not designed for. For a sound card sampling at 192khz, you would have to use a DSP (possibly included on the chip) or software to filter the high frequencies...
by orbik
Mon Jan 03, 2011 2:35 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0841: "Audiophiles"
Replies: 266
Views: 50932

Re: 0841: "Audiophiles"

... On an unrelated note I tried to set up a set of Older Speaker in My Mum's Kitchen so that she could use a small CD player or her Mp3 player to listen to music as she chose. They are a slightly dated Three piece affair that were also decently cheap at time of Purchase. But after drilling holes t...
by orbik
Sun Dec 12, 2010 9:00 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0832: "Tic-Tac-Toe"
Replies: 180
Views: 57159

Re: 0832: "Tic-Tac-Toe"

For those who think the game is too trivial, try chess. For something somewhere in between, just play tic-tac-toe but don't draw the grid. The rules are the same, but the location of the grid relative to the moves only develops after a few moves. Think about it as if you are playing tic-tac-toe on ...
by orbik
Sun Nov 21, 2010 7:32 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0821: "Five-Minute Comics: Part 3"
Replies: 143
Views: 35082

Re: 0821: "Five-Minute Comics: Part 3"

Had to register just for this comment. :D What do the cellphones need a sloped surface for? The vibrator is practically always an offset weighted rotor, and as long as the surface friction between the phone cover and the table isn't zero, the horizontal shifting of the phone's center of mass during ...

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