Experimental demonstration of in-service dispersion monitoring in the whole transmission bandwidth of WDM systems by optical frequency-modulation method

2003 ◽  
Author(s):  
H. Yoshimi ◽  
Y. Takushima ◽  
K. Kikuchi
Keyword(s):  
Frequency Modulation ◽  
Modulation Method ◽  
Optical Frequency ◽  
Experimental Demonstration ◽  
Transmission Bandwidth

scholarly journals Range-resolved interferometric signal processing using sinusoidal optical frequency modulation

2015 ◽  
Vol 23 (7) ◽  
pp. 9415 ◽  
Author(s):  
Thomas Kissinger ◽  
Thomas O.H. Charrett ◽  
Ralph P. Tatam
Keyword(s):  
Signal Processing ◽  
Frequency Modulation ◽  
Optical Frequency

Natural frequency modulation of a kinematically redundant planar parallel robot

2021 ◽  
pp. 095440622110524
Author(s):  
Jiawei Gu ◽  
Zhijiang Xie ◽  
Jian Zhang ◽  
Yangjun Pi
Keyword(s):  
Natural Frequency ◽  
Frequency Modulation ◽  
Natural Frequencies ◽  
Vibration Suppression ◽  
Excitation Frequency ◽  
Parallel Robot ◽  
Modulation Method ◽  
Kinematic Redundancy ◽  
Resonance Amplitude ◽  
Searching Method

When a parallel robot is equipped with kinematic redundancy, it has sufficient capabilities of natural frequency modulation through adjusting geometric configuration. To reduce resonance of a mechanism, this paper investigates the natural frequency modulation of a kinematically redundant planar parallel robot. A double-threshold searching method is proposed for controlling the inverse kinematics solution and keeping the natural frequencies away from the excitation frequency. The effectiveness of modulating the natural frequencies is demonstrated by comparing it with a non-modulation method. The simulation results indicate that, in all directions, the responses are coupled, and every order should be taken into consideration during natural frequency modulation. Compared to the non-modulation method, the proposed method can reduce the resonance amplitude to a certain extent, and the effect of vibration suppression is remarkable.

Terompong Basic Tone Synthesis with Frequency Modulation Method

2021 ◽  
Vol 9 (3) ◽  
pp. 429
Author(s):  
I Gede Erwin Winata Pratama ◽  
Luh Arida Ayu Rahning Putri
Keyword(s):  
Fundamental Frequency ◽  
Frequency Modulation ◽  
Musical Instrument ◽  
Sound Synthesis ◽  
Modulation Method ◽  
The Difference

Terompong is a type of gamelan in Bali Province. This gamelan is commonly used in traditional ceremonies in Bali, especially the Dewa Yadnya and Pitra Yadnya. The terompong are striking instruments, where the bat is made of wood. The terompong is also a two-octave musical instrument composed of 10-12 small metal gong blocks. The gong blocks are arranged parallel, which makes the gong difficult to carry and has to stay somewhere if someone want to play. Of course, with this situation people find it difficult to learn the terompong because they are quite large and heavy. This problem could be solved by replace the original terompong with synthetic terompong. The synthesis referred here the synthesis of sound. In performing sound synthesis, the method used is Frequency Modulation (FM). The result of the synthesis carried out where the difference between fundamental frequency of the original tone and the synthesis tone is almost close to zero. The sound produced almost follows the original sound, but it can't follow the sound of metal being hit with a wooden club.

Suppression of backscattering-induced noise in a resonator optic gyro by the dual-frequency modulation method

2020 ◽  
Vol 459 ◽  
pp. 124766
Author(s):  
Haoyu Wang ◽  
Wenyao Liu ◽  
Ziwen Pan ◽  
Yu Tao ◽  
Jian Niu ◽  
...  
Keyword(s):  
Frequency Modulation ◽  
Modulation Method ◽  
Dual Frequency
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