The difference between the two sound carriers is 15.5 times the line frequency ( 15.5 x 15625 Hz = 242187.5 Hz ) which, being an odd multiple of half line frequency, reduces the visibility of intermodulation products between the two carriers.
42.
Since the line frequency ( number of lines per second ) is 15625 Hz ( 625 lines ?50 Hz ?2 ), the colour carrier frequency calculates as follows : 4.43361875 MHz = 283.75 ?15625 Hz + 25 Hz.
43.
The difference between the two sound carriers is 15.5 times the line frequency ( 15.5 x 15625 Hz = 242187.5 Hz ) which, being an odd multiple of half line frequency, reduces the visibility of intermodulation products between the two carriers.
44.
Electronic ballasts usually supply power to the lamp at a frequency of or higher, rather than the mains frequency of; this substantially eliminates the stroboscopic effect of flicker, a product of the line frequency associated with fluorescent lighting ( see photosensitive epilepsy ).
45.
The SLIMbus CLK line frequency is determined by a range of " Root " clock frequencies up to 28 MHz, and 10 Clock Gears for altering the clock frequency by powers of 2 over a span of 512x from lowest to highest Gear.
46.
Lastly, in what appears to be a coincidence, the 44.1 kHz sampling rate is exactly 4 times the line frequency of the old 441 lines German TV standard, which had a frequency of 441 ?50 ?2 = 11, 025 Hz ( 441 lines per frame, 50 fields per second, 2 fields per frame ).
47.
Due to the line-by-line scanning motion, a proper comparison on the speed requires not only the framerate, but also the number of pixels in an image : with a framerate of 10 Hz and 100x100 pixels the tip moves with a line frequency of 1 kHz, whereas it moves with only with 500 Hz, when measuring with a faster framerate of 50 Hz but only 10x10 pixels.
