Frequency domain speech bandwidth extension

2019 ◽  
pp. 177-183
Author(s):  
N. Prasad ◽  
P. Akhendra Kumar
Keyword(s):  
Frequency Domain ◽  
Bandwidth Extension

Iterative deconvolution using generalized “positivity”

Geophysics ◽  
1989 ◽  
Vol 54 (10) ◽  
pp. 1297-1305
Author(s):  
Scott C. Hornbostel
Keyword(s):  
Frequency Domain ◽  
Signal To Noise Ratio ◽  
A Priori ◽  
Simulated Data ◽  
Interesting Property ◽  
Explicit Calculation ◽  
Positive Signal ◽  
Step Size ◽  
Bandwidth Extension ◽  
Band Limited

In some cases a real signal may be known a priori to be always positive. If this positive signal is later band‐limited, the knowledge of its original positivity can be used to help in recovering the lost frequencies. Specifically, the frequency‐domain values for members of this special class of signals have the interesting property that they are related to each other via the self‐convolution of Hermitian functions. This relationship is the basis for some current deconvolution approaches and can be generalized for the case of a signal of arbitrary sign. A steepest descent formulation in the frequency domain can determine these Hermitian functions while maximizing the fit to the known in‐band data and to estimated dc values. This formulation allows for the explicit calculation of the step size and is also easily modified to include finite support or penalty/reward constraints. Simulated data tests indicate good bandwidth extension for this method, while actually sometimes improving the signal‐to‐noise ratio of the in‐band values.

Correction to "The analysis of slug tests in the frequency domain" (WRR 25(11), pp. 2388-2396

1990 ◽  
Vol 26 (8) ◽  
pp. 1863-1863
Author(s):  
Paul Marschall ◽  
Baldur Barczewski
Keyword(s):  
Frequency Domain ◽  
Slug Tests

Methods of calibration of high-resolution optical reflectometers operating in the frequency domain

2018 ◽  
pp. 40-43
Author(s):  
V.V. GRIGORIEV ◽  
◽  
V.E. KRAVTSOV ◽  
A.K. MITUEV ◽  
E.A. MOROZ ◽  
...  
Keyword(s):  
High Resolution ◽  
Frequency Domain

High Resolution Ultrasound Imaging Using Frequency Domain Interferometry

2012 ◽  
Vol 132 (10) ◽  
pp. 1552-1557 ◽  
Author(s):  
Hirofumi Taki ◽  
Takuya Sakamoto ◽  
Makoto Yamakawa ◽  
Tsuyoshi Shiina ◽  
Toru Sato
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
Ultrasound Imaging
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