Results 71 to 80 of about 918 (208)

Companding and random quantization in several dimensions [PDF]

IEEE Transactions on Information Theory, 1981
The problem of implementing multidimensional quantizers is discussed. A general equation is derived that can be used to evaluate the performance of multidimensional compandors. It is demonstrated that the optimal compandor must be conformal almost everywhere.
openaire   +2 more sources

Companding techniques for high dynamic range audio CODEC receiver path [PDF]

, 2009
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.Includes bibliographical references (p.
Ma, Yunjie, M. Eng. Massachusetts Institute of Technology
core  

An FFT-Based Companding Front End for Noise-Robust Automatic Speech Recognition

EURASIP Journal on Audio, Speech, and Music Processing, 2007
We describe an FFT-based companding algorithm for preprocessing speech before recognition. The algorithm mimics tone-to-tone suppression and masking in the auditory system to improve automatic speech recognition performance in noise.
Turicchia Lorenzo, Sarpeshkar Rahul, Raj Bhiksha, Schmidt-Nielsen Bent   +3 more
doaj   +2 more sources

A Companding Technique for PAPR Reduction of OFDM Systems

, 2017
[[abstract]]A companding technique using the hyperbolic tangent transform is proposed for reducing the peak-to-average-power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals.
HAO, Miin-Jong;LIAW, Chung-Ping
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A New Linear Companding Transform to Reduce the PAPR in OFDM System under Rayleigh Distribution

, 2021
Large amplitude fluctuations causeserious issues in orthogonal frequency-division multiplexing (OFDM) signals, when a nonlinear power amplifier (NLPA) has been utilized.
Dr. Gopala Krishnan, Venkatesh Thota
core   +1 more source

Optimal Compressor Functions for Multidimensional Companding of Memoryless Sources

, 1998
We determine the asymptotically optimal compressor function for a multidimensional compander when the source is memoryless. Under certain technical assumptions on the compressor function, it is shown that the best k-dimensional compressor function ...
David L. Neuhoff, Peter W. Moo
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Companding to improve cochlearimplant speech recognition in speech-shaped noise,” [PDF]

, 2007
Nonlinear sensory and neural processing mechanisms have been exploited to enhance spectral contrast for improvement of speech understanding in noise. The "companding" algorithm employs both two-tone suppression and adaptive gain mechanisms to ...
Aparajita Bhattacharya, Fan-Gang Zeng
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FEC-Assisted PAPR Reduction in OFDM System—Performance Analysis

IEEE Access
As 6G standardization continues, Orthogonal Frequency Division Multiplexing (OFDM) continues to be the preferred waveform due to its spectral efficiency and robustness against multipath fading.
K. M. Kaushal Karthik, K. Phani Samhitha, S. R. Swateekha, C. Hemanth, R. G. Sangeetha   +4 more
doaj   +1 more source

The Research on Improved Companding Transformation for Reducing PAPR in Underwater Acoustic OFDM Communication System

Discrete Dynamics in Nature and Society, 2016
To solve the problem of the high peak-to-average power ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) for the underwater acoustic communication system, the paper offers a method of reducing PAPR which combines the amplitude limiting ...
Jinqiu Wu, Gang Qiao, Xiaofei Qi
doaj   +1 more source

Companding Flash Analog-To-Digital Converters

, 1986
This report will demonstrate how a companding flash analog-to-digital converter can be used to satisfy both the dynamic range and resolution requirements of an infrared imaging system.
Brig, Michael P.
core