Results 151 to 160 of about 2,477 (201)

Companding Digital Signal Processors

2006 IEEE International Conference on Acoustics Speed and Signal Processing Proceedings, 2006
We discuss a technique whereby internal signals in a DSP can be controlled externally without causing output disturbances. This is used to extend the technique of companding (compressing and expanding), widely used in transmission and sound recording, to digital signal processors.
Aaron E. Klein, Yannis P. Tsividis
openaire   +1 more source

Companding system with time clustering

2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754), 2005
In the compressing and expanding (companding) method, at the transmitter, baseband signals are compressed for reducing peak-to-average power (PAPR) and at the receiver, the received signals are expanded for removing the distortion caused by the compressing. However, since the signals are distorted by the band pass filter (BPF), the high power amplifier
Osamu Takyu, Tomoaki Ohtsuki, Masao Nakagawa   +2 more
openaire   +1 more source

A homomorphic approach to companding

Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers, 2002
The procedure of first COMpressing and then exPANDing a signal is known as "companding". In pulse code modulation systems, commonly used in telephone switching networks, samples of an analog speech waveform are encoded as binary words and transmitted.
C.S. Lindquist, S.K. Mukherjee
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Adaptive Companded Pulse Code Modulation

IEEE Transactions on Communications, 1983
In this paper, a novel quantization scheme-adaptive companded pulse code modulation (ACPCM)-is proposed. It is shown that, for fine quantization of analog signals, ACPCM will outperform the widely used PCM and DPCM in the sense of minimizing the meansquared quantizing error. For autoregressive (AR)signals, ACPCM is shown to reduce to DPCM.
James A. Bucklew, F. T. Tzeng
openaire   +2 more sources

Companding turbo decoder

2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484), 2003
The memory requirement for the uniform quantization turbo decoder is very large. The nonuniform quantization provides better or identical performance than the uniform scheme. But it is inconvenient for the latter to implement with the hardware circuits.
null Kai Niu, null Wei Ling Wu
openaire   +1 more source

Comparision between SLM-companding and precoding-companding techniques in OFDM systems

2016 International Conference on Circuit, Power and Computing Technologies (ICCPCT), 2016
OFDM is a multicarrier modulation technique which is used in communication systems like Wireless Personal Area Network (WPAN), Wireless Local Area Network (WLAN), Wireless Metropolitan Area Network (WMAN), Wi-Max, DVB-T etc for the high rate transmission over wireless radio channels.
Alex Kangappaden, Angila Rose Daniel, V P Peeyusha, M Ponmani Raja, P Sneha, A M Vishnu Das   +5 more
openaire   +1 more source

Companding nonlinear correlators

SPIE Proceedings, 2004
In this paper we summarize a new category of all optical companding nonlinear correlators developed by our group in the last decade. All optical companding nonlinear correlators consist oftwo families: The first is based on energy transfer between the joint spectra of reference and signal images.
Jed Khoury, Peter D. Gianino, Charles L. Woods   +2 more
openaire   +1 more source

Series Solutions of Companding Problems

Bell System Technical Journal, 1983
A formal power series solution (i) x(t) = Σ 1 ∞ mk x k (t) is given for the companding problem (ii) Bf{x(t)} = my(t), B{x(t)} = x(t), where B is the bandlimiting operator defined by Bg = (Bg)(t) = ∫ g(s)[sin λ(t − s)]/[π(t − s)]ds and f(t) has a Taylor series with f(0) = 0, f′(0) ≠ 0. Expressions for the x k are given in terms of the coefficients of f,
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Statistics of companding noise for QAM transmission

IEEE Transactions on Communications, 1996
In modern voiceband data communication, the received signal is subject to nonlinear quantization noise due to companding. Under certain conditions, this quantization noise may become dominant and cause serious degradation in performance. In order to design better signal constellations for this environment, it is of interest to characterize this noise ...
Jeffrey Davidson, Irving Kalet
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Instantaneously Companding Digital Signal Processors

2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07, 2007
We extend the technique of instantaneous companding (compressing and expanding) to digital signal processors (DSPs). Companding has been used for many years in non-dynamical channels, but the dynamical nature of DSPs causes output distortion in standard implementations of companding, where a compressor and expander are used at the input and output ...
Aaron E. Klein, Yannis P. Tsividis
openaire   +1 more source