Frequency Response Calibration Using Multi-Channel Wiener Filters for Microphone Arrays

2019 ◽  
Vol 19 (17) ◽  
pp. 7507-7514 ◽  
Author(s):  
De Hu ◽  
Zhe Chen ◽  
Fuliang Yin
Keyword(s):  
Frequency Response ◽  
Microphone Arrays ◽  
Wiener Filters

Adaptive Frequency Response Calibration Method for Microphone Arrays

2020 ◽  
Vol 20 (13) ◽  
pp. 7118-7128 ◽  
Author(s):  
Rui Wang ◽  
Zhe Chen ◽  
Fuliang Yin
Keyword(s):  
Frequency Response ◽  
Calibration Method ◽  
Microphone Arrays

A simple way for producing holographic filters suitable for image improvement

1978 ◽  
Vol 36 (1) ◽  
pp. 226-227
Author(s):  
K.-H. Herrmann ◽  
E. Reuber ◽  
P. Schiske
Keyword(s):  
Transfer Functions ◽  
Diffraction Order ◽  
Lateral Position ◽  
Simple Method ◽  
Spatial Frequencies ◽  
Resolution Electron ◽  
Wiener Filters ◽  
Image Improvement ◽  
Optical Reconstruction ◽  
Set Up

Aposteriori deblurring of high resolution electron micrographs of weak phase objects can be performed by holographic filters [1,2] which are arranged in the Fourier domain of a light-optical reconstruction set-up. According to the diffraction efficiency and the lateral position of the grating structure, the filters permit adjustment of the amplitudes and phases of the spatial frequencies in the image which is obtained in the first diffraction order.In the case of bright field imaging with axial illumination, the Contrast Transfer Functions (CTF) are oscillating, but real. For different imageforming conditions and several signal-to-noise ratios an extensive set of Wiener-filters should be available. A simple method of producing such filters by only photographic and mechanical means will be described here.A transparent master grating with 6.25 lines/mm and 160 mm diameter was produced by a high precision computer plotter. It is photographed through a rotating mask, plotted by a standard plotter.

Statistics of frequency-response estimates

1990 ◽  
Vol 137 (5) ◽  
pp. 290 ◽  
Author(s):  
J.L. Douce ◽  
L. Balmer
Keyword(s):  
Frequency Response

Estimation and Reduction of Motor Input Surge Voltage using Frequency Response Analysis

2012 ◽  
Vol 132 (8) ◽  
pp. 630-637
Author(s):  
Toru Wakimoto ◽  
Yoshimitsu Takahashi ◽  
Norihito Kimura ◽  
Yukitoshi Narumi ◽  
Naoki Hayakawa
Keyword(s):  
Frequency Response ◽  
Response Analysis ◽  
Frequency Response Analysis
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