We can extend our tuning system by thinking of G as our base note, and looking at its harmonics. When we do, we get two new notes. The third harmonic of G is D at 9 Hz. (Thanks to octave equivalency, we can also make Ds at 9/2 Hz, and 9/4 Hz, and 9/8 Hz, and 18 Hz, and 36 Hz, and so on.) The fifth harmonic of G is B at 15 Hz. (There are also Bs at 15/2 Hz, and 30 Hz, and so on.)
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That wasn't entirely clear after six days of preseason testing in Bahrain, nor really after Friday's two practice sessions in Melbourne, topped by Charles Leclerc's Ferrari and Oscar Piastri's McLaren, respectively. The Mercedes team didn't look particularly worried, and on Saturday, we found out why when George Russell finally left off the sandbags and showed some true pace, lapping more than six-tenths faster by the end of free practice than the next-quickest car, the Ferrari of Lewis Hamilton.
It gets worse. We want to know the visible area. On NTSC, the vertical blanking interval is approximately 22 lines per field. My reading of the FCC standard is that that should remain the same for color relative to the line frequency. So 262 becomes 240p, and 202 becomes 180p. Technically, it could get even worse. Vertical overscan is a thing; the Apple ][ places only 192 lines under computer control. But let’s stick with 180 horizontal lines. Here’s a size comparison on the vertical axis, ignore the horizontal.
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items fits in our small stack-allocated buffer, we perform exactly 1，更多细节参见新收录的资料