VHDL implementation of adaptive control unit in CIR-based adaptive K-best sphere decoder for DVB-T2

2013 ◽  
Author(s):  
Ahmad A. Aziz El-Banna ◽  
Maha El-Sabrouty ◽  
Adel Abdelrahman
Keyword(s):  
Adaptive Control ◽  
Control Unit ◽  
Sphere Decoder ◽  
Vhdl Implementation

Adaptive Process Control in Noncircular Grinding

1999 ◽  
Author(s):  
Hans Kurt Tönshoff ◽  
Stephan Scherger ◽  
Helmut Hinkenhuis
Keyword(s):  
Adaptive Control ◽  
Process Control ◽  
Position Control ◽  
Dimensional Accuracy ◽  
Control Unit ◽  
Setup Time ◽  
Relevant Information ◽  
Adaptive Process Control ◽  
Tangential Forces ◽  
Hybrid Adaptive Control

Abstract Conventional process control in noncircular grinding requires high efforts concerning adjustment and optimization. The increasing demands on multi-product-ability as well as small lot sizes or single piece production do no longer allow these efforts. Furthermore, process relevant information like normal or tangential forces is not monitored, consequently there is no possibility for process quality control to support a constant workpiece quality. This article introduces a hybrid adaptive control which consists of three components: The contour pre-filtering unit converts the contour data into a nominal value curve that is twice differentiable. Limited dynamic ranges of the drives, especially at high rates of workpiece rotations, are considered in the predictive feeddrive position control unit. The normal force control unit keeps the swelling of the machine at a constant value and therefore improves the dimensional accuracy of noncircular workpieces like e.g. cams. The hybrid adaptive control dramatically reduces the setup time of the process and results in improved workpiece quality.

Design and performance of a small-scale solar ice-maker based on a DC-freezer and an adaptive control unit

Solar Energy ◽  
2016 ◽  
Vol 139 ◽  
pp. 433-443 ◽  
Author(s):  
Victor Torres-Toledo ◽  
Klaus Meissner ◽  
Philip Täschner ◽  
Santiago Martınez-Ballester ◽  
Joachim Müller
Keyword(s):  
Adaptive Control ◽  
Control Unit ◽  
Small Scale ◽  
And Performance

Video-Enhanced Microscopy--Better Visibility of Plant Cell Structures

1982 ◽  
Vol 40 ◽  
pp. 182-185
Author(s):  
N.S. Allen ◽  
R.D. Allen
Keyword(s):  
Diffraction Pattern ◽  
Theoretical Basis ◽  
Numerical Aperture ◽  
Gain Control ◽  
Control Unit ◽  
Camera Control ◽  
Variable Gain ◽  
Contrast Method ◽  
Fine Detail ◽  
Cell Structures

Various methods of video-enhanced microscopy combine TV cameras with light microscopes creating images with improved resolution, contrast and visibility of fine detail, which can be recorded rapidly and relatively inexpensively. The AVEC (Allen Video-enhanced Contrast) method avoids polarizing rectifiers, since the microscope is operated at retardations of λ/9- λ/4, where no anomaly is seen in the Airy diffraction pattern. The iris diaphram is opened fully to match the numerical aperture of the condenser to that of the objective. Under these conditions, no image can be realized either by eye or photographically. Yet the image becomes visible using the Hamamatsu C-1000-01 binary camera, if the camera control unit is equipped with variable gain control and an offset knob (which sets a clamp voltage of a D.C. restoration circuit). The theoretical basis for these improvements has been described.

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