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So, I'm filling out the New Patient Survey form at Chicago Back Institute, and one of the questions asks "Date of onset of current episode / what activities were you engaged in when the pain began?" I got to write something I never thought I'd put on a medical form: "Getting into and out of a Mazda Miata several times, with the top up, while carrying a laptop computer."
And, since if the pictures thread, pictures of the nerves in my left leg not quite doing what they're supposed to:
In the context of music, it means that two or more instruments are played in proper time with one another (what an electrical engineer might describe as "freq locked and in phase") such that notes which correspond in time within the original composition are either generated simultaneously (in the case of electronic or electronically-amplified instrument) or arrive simultaneously at some point such as a common microphone, a listener, etc (in the case of un-amplified, acoustic instruments).
In the context of video, it means that two or more signals arriving at a device (such as a switcher) are time-aligned such that the beginning of each frame arrives at precisely the same moment from all sources at the destination device. This is necessary in order to cleanly switch, dissolve, key, etc., between different sources. To achieve this, frequency is aligned by feeding each source device a common reference clock from a single source (typically a 29.97 Hz pulse*), and phase is aligned by some combination of varying cable lengths and electronic delays.
* = in NTSC-heritage regions. 25 Hz is typically used in PAL-heritage areas. In applications involving cinema, 24 Hz is most common, though many variations are beginning to emerge with the rise of "high-framerate" cinema, which can rot in hell.
It can also indicate that the audio and video portions of a common performance are time-aligned with one another. This is commonly called "lip-sync", even if the material in question is not a mouth. For instance, when watching a baseball game on television, we expect to hear the "crack" of a bat striking a pitched ball at the same time that we see the bat make contact with the ball, despite the fact that these two pieces of information do not actually arrive at the same time at most locations from which a spectator would likely observe them in person at the baseball arena, owing to the vastly differing speeds at which light and sound travel through air, and the relatively large distances between the batter and a typical spectator in such a setting.
As this paper describes, this is, surprisingly, not the most unusual way in which the physics of perception might function counterintuitively (as compared with "common-sense" expectations) within the context of a game of baseball.
Originally Posted by Braineack
thats like the least punk rock thing ive ever seen.
Which kinda makes sense, given that Nirvana never claimed to be a punk band...
This is the least punk-rock thing I've seen in the past few minutes:
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