120 Hz

(redirected from 72 Hz)

120 Hz

The frame rate of many modern flat panel TVs, which is designed to improve fast action and movies by providing smoother transitions from frame to frame. The TV doubles the common digital frame rate of 60 frames per second (fps) to 120 fps by duplicating each frame and displaying them all in one second. However, the duplicated frames are altered (interpolated) to become transition frames between the original frames and the following ones (see below).

Another advantage to 120 Hz is that it improves the conversion of movies shot at 24 fps to TVs that run at 60 fps (60 Hz). In order to fit 24 movie frames into 60 TV frames, the traditional telecine method generates uneven transitions because 24 does not divide evenly into 60. Telecine converts one frame into three frames and the next frame into two frames, called "3:2 pulldown." However, since 24 divides evenly into 120, every movie frame can be interpolated into five video frames, known as "5:5 pulldown." In addition, HDTVs have also been made with 48, 72 and 96 Hz frame rates because 24 divides evenly into these numbers. See 240 Hz, 480 Hz and telecine.


Duplicate and Smooth
By doubling the frame rate, a transition frame can be created between each two original frames.







5:5 Pulldown
Since 24 divides evenly into 120, each film frame shot at 24 fps can be converted into the same number of video frames. See telecine.
References in periodicals archive ?
Beige solid in yield 95%; mp 150-152[degrees]C; IR (KBr, [cm.sup.-1]): 3233 (NH), 1679 (C=N), 1587, 1517 (C=C); [sup.1]H NMR (DMSO-[d.sub.6]): [delta] = 4.52 (d, 2H, J = 6.0 Hz, C[H.sub.2] NH), 7.18 (t, [sup.1]H, J = 72 Hz, Ar), 727 (t, 2H, J = 8.0 Hz, Ar), 7.30-7.42 (m, 8H, Ar), 7.63 (d, 4H, J = 8.0 Hz, Ar), 8.14 (s, 1H, CH), 11.12 (brs, 1H, NH) ppm; [sup.13]C NMR (DMSO-[d.sub.6]): [delta] = 43.8,126.9, 127.6, 128.6, 130.1, 136.8, 140.7, 143.0, 157.9, 164.6 ppm; Anal.
Uniaxial testing in the X direction stimulated a resonance at approximately 72 Hz with the component rocking back and forth in the X direction.
241-244[degrees]C; [sup.1]H NMR: ppm 8.57 (d, J = 72 Hz, 1H), 8.48 (d, J = 4.4 Hz, 1H), 7.77 (d, J = 4.4 Hz, 1H), 7.62 (d, J = 8.1 Hz, 1H), 7.52-7.34 (m, 5H), 7.00 (t, J = 8 Hz, 1H), 6.74 (d, J = 8 Hz, 1H); [sup.13]C NMR: ppm 162.0,161.8, 151.1, 150.5, 150.3, 139.6, 134.2, 132.7, 132.3, 130.6, 130.3, 127.8, 127.6, 126.8, 126.5, 124.2, 123.5, 122.8, 115.3; HRMS (ESI+), m/z [C.sub.19][H.sub.12]Cl[N.sub.4]O (M + h)+ calc: 347.0700 obs: 347.0694.
The output variable frequency can be adjusted from 0 to 72 Hz, and controlled using a variety of standard local area networks allowing computer speed control.
205-207[degrees]C; IR (KBr, [cm.sup.-1]): 1598 (C=O), 1567, 1485, 1446,1384 [cm.sup.-1]; [sup.1]H NMR (300 MHz, CD[Cl.sub.3]): [delta] 4.85 (s, 4H, -O-C[[H.bar].sub.2-]), 5.06 (s, 4H, -C[[H.bar].sub.2-]O-), 6.77 (d, 4H, J = 72 Hz), 6.80 (t, 2H, J = 7.5 Hz), 6.97 (t, 4H, J = 7.8 Hz), 7.18-7.26 (m, 10H), 7.27 (d, 2H, J = 16.2 Hz, 2 x H-[alpha]), 7.38 (dt, 2H, J = 7.5 and 1.5 Hz), 7.47 (dd, 2H, J = 8.4 and 1.5 Hz), 7.70 (d, 2H, J = 16.2 Hz, 2 x H-[beta]); [sup.13]C NMR (75 MHz, CD[Cl.sub.3]): S 68.23, 68.48, 112.47, 112.75, 121.04, 121.21, 123.98, 127.65, 128.10, 128.11, 128.48, 129.40, 129.60, 130.10, 130.21, 131.47, 132.23, 133.81,134.42,140.17, 156.42,157.10,194.64 (C=O); MS (TOF MS [ES.sup.+]): m/z 707.18 [(M+Na).sup.+], 685.19 [(M+H).sup.+].
[sup.1]H-NMR ([delta], CD[Cl.sub.3]) ppm: 5.56 ([sup.1]H, d, J = 5.2 Hz), 3.77 ([sup.1]H, d, J = 7.2 Hz), 3.16 ([sup.1]H, m), 2.84 (3H, s), 2.76 ([sup.1]H, m), 1.76 (3H, s), 1.06 (3H, d, J = 72 Hz), and 0.94 (3H, d, J = 6.4 Hz); [sup.13]CNMR ([delta], CD[Cl.sub.3]) ppm: 38.4 (C-1), 27.1 (C-2), 124.0 (C-3), 132.3 (C-4), 69.2 (C-5), 84.9 (C-6), 37.9 (C-7), 24.3 (C-8), 32.0 (C9), 32.9 (C-10), 38.4 (C-11), 178.2 (C-12), 8.7 (C-13), 19.2 (C14), and 20.6 (C-15); EI-MS: 250 (1), 167 (100), 151 (20), 121 (11), and 84 (73).
[sup.1]H NMR (300 MHz, CD[Cl.sub.3]): [[delta].sub.H] 2.16 (s, 3H), 4.03 (br s, 1H), 5.65 (s, 1H), 6.73 (dd, J = 8.5, 0.7 Hz, 2H), 6.96 (t, J = 72 Hz, 1H), 7.25-7.30 (m, 2H), 7.43 (dd, J = 8.5, 2.0 Hz, 1H), 764 (d, J = 2.0 Hz 1H), 7.70 (d, J = 8.5 Hz, 1H).
Oil; EI-MS m/z 298, 205, 177, 135; UV [[lambda].sub.max] ([H.sub.2]O/C[H.sub.3]CN 1/1) nm275 (log [epsilon] 3.2), 244 (log [epsilon] 4.0); :H NMR (CD[Cl.sub.3]) [delta] 7.61 (s, 1H), 7.52 (s, 1H), 7.33-7.29 (m, overlapped signals, 4H), 7.16 (t, J = 7.1 Hz, 1H), 7.10 (br s, 2H), 7.04 (d, 7 = 72 Hz, 1H), 3.81 (br q, 2H), 2.12 (s, 3H), 1.24 (br t, 3H).
VGA/ PAL is generated at up to 240 Hz, double-VGA or PAL at up to 120 Hz, 720p at up to 120Hz (1/4-inch), and 1080p at 30, 60 and 72 Hz.
At the machine's original maximum speed (72 Hz drive output frequency), the oscillation rate was 11 Hz (90 ms period), and directly proportional to the speed of the motor.
A maximum resolution of 1024 x 768 pixels, dot pitch of 0.297 mm, and a maximum video refresh speed of 72 Hz ensure flicker-free image quality.
Two sounds (832 and 72 Hz) of equal [P.sub.e] at 4 cm from the speaker attenuated differentially; consequently, at 30 cm, the 832-Hz sound was only 10% as loud as the 72-Hz sound (Fig.