Excitation source analysis for high-quality speech manipulation systems based on an interference-free representation of group delay with minimum phase response compensation

2014 ◽  
Author(s):  
Hideki Kawahara ◽  
Masanori Morise ◽  
Tomoki Toda ◽  
Hideki Banno ◽  
Ryuichi Nisimura ◽  
...  
Keyword(s):  
Group Delay ◽  
Phase Response ◽  
Excitation Source ◽  
Source Analysis ◽  
Minimum Phase ◽  
High Quality ◽  
Free Representation

Dynamics and Trajectory Tracking Control of a Two-Link Robot Manipulator

2004 ◽  
Vol 10 (10) ◽  
pp. 1415-1440 ◽  
Author(s):  
Anthony Green ◽  
Jurek Z. Sasiadek
Keyword(s):  
Fuzzy Logic ◽  
Time Delay ◽  
Inverse Dynamics ◽  
Position Control ◽  
Robot Manipulator ◽  
Phase Response ◽  
Control Law ◽  
Minimum Phase ◽  
Linear Quadratic ◽  
Trajectory Tracking Control

Operational problems with robot manipulators in space relate to several factors, most importantly, structural flexibility and subsequent difficulties with their position control. In this paper we present control methods for endpoint tracking of a 12.6 × 12.6m2 trajectory by a two-link robot manipulator. Initially, a manipulator with rigid links is modeled using inverse dynamics, a linear quadratic regulator and fuzzy logic schemes actuated by a Jacobian transpose control law computed using dominant cantilever and pinned-pinned assumed mode frequencies. The inverse dynamics model is pursued further to study a manipulator with flexible links where nonlinear rigid-link dynamics are coupled with dominant assumed modes for cantilever and pinned-pinned beams. A time delay in the feedback control loop represents elastic wave travel time along the links to generate non-minimum phase response. A time delay acting on control commands ameliorates non-minimum phase response. Finally, a fuzzy logic system outputs a variable to adapt the control law in response to elastic deformation inputs. Results show greater endpoint position control accuracy using a flexible inverse dynamics robot model combined with a fuzzy logic adapted control law and time delays than could be obtained for the rigid dynamics models.

scholarly journals Minimum Phase Property of Chebyshev-Sharpened Cosine Filters

2015 ◽  
Vol 2015 ◽  
pp. 1-14
Author(s):  
Miriam Guadalupe Cruz Jiménez ◽  
David Ernesto Troncoso Romero ◽  
Gordana Jovanovic Dolecek
Keyword(s):  
Computational Complexity ◽  
Group Delay ◽  
Minimum Phase ◽  
Similar Magnitude ◽  
Low Delay ◽  
Phase Property ◽  
Decimation Filter ◽  
The Cost ◽  
Lower Group

We prove that the Chebyshev sharpening technique, recently introduced in literature, provides filters with a Minimum Phase (MP) characteristic when it is applied to cosine filters. Additionally, we demonstrate that cascaded expanded Chebyshev-Sharpened Cosine Filters (CSCFs) are also MP filters, and we show that they achieve a lower group delay for similar magnitude characteristics in comparison with traditional cascaded expanded cosine filters. The importance of the characteristics of cascaded expanded CSCFs is also elaborated. The developed examples show improvements in the group delay ranged from 23% to 47% at the cost of a slight increase of usage of hardware resources. For an application of a low-delay decimation filter, the proposed scheme exhibits a 24% lower group delay, with 35% less computational complexity (estimated in Additions per Output Sample) and slightly less usage of hardware elements.

Group Delay Measurements of High Quality GaAs Photonic Crystal Cavities

2007 ◽  
Author(s):  
T. Sunner ◽  
M. Gellner ◽  
A. Loffler ◽  
M. Kamp ◽  
A. Forchel
Keyword(s):  
Photonic Crystal ◽  
Group Delay ◽  
High Quality ◽  
Photonic Crystal Cavities

Transfer functions for the seismic research observatory seismograph system

1978 ◽  
Vol 68 (2) ◽  
pp. 501-512 ◽  
Author(s):  
Douglas W. McCowan ◽  
Richard T. Lacoss
Keyword(s):  
Polynomial Approximation ◽  
Group Delay ◽  
Transfer Functions ◽  
Phase Response ◽  
Impulse Responses ◽  
Long Period ◽  
Short Period ◽  
Group Delays

Abstract Transfer functions are given for all basic elements of the Seismic Research Observatory (SRO) seismograph system. These include the seismometer, response shaping filters, and anti-alias filters. With these transfer functions the amplitude and phase responses can be calculated at any frequency by the evaluation of a ratio of polynomials in s = iω. Amplitude and phase response plots and impulse responses are given for the most important overall transfer functions. In addition, long- and short-period group delays have been calculated by numerical differentation of phase responses. In the long-period case a simple polynomial approximation to the group delay is given as an aid in interpretation of data. The transfer functions are exact and follow from the integral design of the system.

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