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About 1,821 papers for “Adaptive equalizer”

Volume adaptive equalizer

Rob Milchem · Southampton Solent University Digital Library · 2009

The human ear can in many ways be likened to a microphone. As with a microphone, it has its own unique frequency response, a response which just like that of the microphone varies with sound pressure level. This variation explains why music sounds fuller at louder volumes. At such levels the ear produces a flatter response across the spectrum. This report outlines the design and implementation of an Audio Unit plugin, capable of correcting the ear's variable response.
\nThe device as constructed operates as a graphic equalizer, pre-programmed with settings to suit the listening conditions from quiet to loud. The design stages and implementation are fully documented and the device produced is subsequently tested and substantiated for its intended purpose. The later design stages for automating the device using the output voltage of a microphone remain unimplemented due to time constraints. Finally, recommendations are made for the further development of the project.
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Cited by 0

Adaptive room response equalizer

F. Kerendian · Proceedings of WESCON '94 · 2002

The objective of this project was to design a system to use magnitude normalization as a method of adaptive equalization. The system is targeted at equalizing a room response. The method used is to decompose the signal into its frequency components (N frequency bands) and normalize each band to obtain a flat frequency response of the entire signal path. This path consists of the amplifier, the speaker box and the room. This paper presents four methods of magnitude normalization. Normalizer -cell2.2- was selected as the best normalizing element for this project. This cell is implemented digitally on a microcontroller. The stability of the system is discussed in the paper which shows a trade off between the rate of convergence and the deviation from the optimal solution achievable by the hardware. Finally, other implementations of the system are discussed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Cited by 0

A nonlinear adaptive equalizer

Wendt, Richard Ernest · Rice University's digital scholarship archive (Rice University) · 1980

The problem of removal of distortion caused by nonlinearities is investigated in light of a known technique of equalization. This inline, open loop, procedure, involving a contraction mapping, is well suited to compensating systems whose inputs are inaccessible. The present contribution is to add an adaptive capability to the scheme, extending its applicability to systems whose nonlinear parameters are unknown or drifting. Results of computer simulations are presented.

Cited by 0Open access

Microcontroller controlled adaptive equalizer

Ender Ergünler · Istanbul Technical University Academic Open Archive (Istanbul Technical University) · 1993

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 1993

Cited by 0

Model-following adaptive equalizer

Bertran Albertí, Eduardo · RECERCAT (Consorci de Serveis Universitaris de Catalunya)

A new methodology is presented for adaptive equalizer design. It could be considered to be kind of generalized and frequency selective automatic gain control (AGC) circuit. This method is based on model reference adaptive systems (MRASs) and has been obtained by applying modern control theories to communication systems. Apart from the robustness, its main advantages are that a feedback channel is not required and that it is not based on iterative or recursive algorithms. Analytical and simulation results are presented

Cited by 0Open access

A CMOS adaptive line equalizer

Masahito Ishikawa, T. Kimura, Norio Tamaki · IEEE Journal of Solid-State Circuits · 1984

A single-chip adaptive line equalizer for a digital transmission system has been developed using a high-frequency switched-capacitor filter technique. The equalizer, consisting of a /spl radic/f and decision-feedback bridged-tap equalizer, is fabricated in a CMOS technology with an effective channel length of 2 /spl mu/m. This permits the use of a 1.6-MHz sampled high-frequency switched-capacitor filter and makes it possible to achieve a small chip size of 6.0/spl times/4.2 mm. This LSI chip can automatically equalize line-loss of up to 42 dB and chemical bridged-tap echoes up to two time slots away from signal pulses at 200 kb/s burst frequency.

Cited by 10

A complex adaptive equalizer ASIC

Bruce Currivan, Miko Flohr · 2003

An adaptive equalizer ASIC has been developed with a structure which implements either the FIR filter function or the adaptive weight generator function. The ASIC contains full complex arithmetic, saturation logic, tap leakage logic, complex conjugation, and selectable adaptation loop gain, and is cascadable without external logic. It contains 4 taps, cascadable to 8 T-spaced or 16 T/2-spaced taps, with each tap having 4 8*8 bit multipliers. The ASIC supports a 10 MHz throughput rate.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Cited by 0

Adaptive Equalizer for Teletext Receiver

Kazuo Kobo, Noriaki Morotomi, Yoïchi Ishibashi et al. · IEEE Transactions on Consumer Electronics · 1986

We have developed a new fully-digital adaptive equalizer for teletext receivers which counteracts waveform distortion using teletext signals as reference signals and compensates equalized waveforms. This equalizer reduces the bit error rate vs. video signal S/N to 1/100 that without the equalizer.

Cited by 5

Adaptive Gain Equalizer for Speech Enhancement

Nils Westerlund, Mattias Dahl, Ingvar Claesson · KTH Publication Database DiVA (KTH Royal Institute of Technology) · 2002

This report presents a noise reduction method for speech communication where the input signal is divided into a number of subbands that are individually weighted in time domain according to the short time Signal-to-Noise Ratio estimate (SNR) in each subband at every time instant. Instead of focusing on suppression the noise, the method is focusing on speech enhancement. The method has proven to be advantageous since it offers low complexity, low delay and low distortion. Also, there is no need for a Voice Activity Detector (VAD). The method is stand-alone and works regardless of speech coding schemes and other surrounding adaptive systems.

Cited by 3Open access

An adaptive equalizer for R-DAT

S. Kato, M. Hori, Yoshiki Kawabe et al. · IEEE Transactions on Consumer Electronics · 1989

An automatic equalizer which reduces the intersymbol interference in digital magnetic recording is applied to the R-DAT (rotary-heads digital audio tape recorder). This equalizer improves the rate of errors caused by the various characteristics of tapes and heads. The hardware implementation is described, and performance results are presented. The technique could be applied to other high-density recording systems.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Cited by 3

An Adaptive Equalizer for Television Channels

E. Arnon · IRE Transactions on Communications Systems · 1969

The time-varying nature of long cable systems precludes their use for the transmission of television signals which require a fine degree of equalization. A system has been built, where the TV channel quality is continuously monitored and the required equalization is automatically performed during signal transmission. The principles and operation of this system are explained, and some actual experimental results are discussed.

Cited by 15

Adaptive Channel Equalizer for WCDMA Downlink

Kari Hooli, Matti Latva-aho, Markku Juntti · 2007

The main 3rd generation cellular communications standard is based on wideband code-division multiple-access (WCDMA). For WCDMA downlink, receivers based on channel equalization at chip level have been proposed to ensure adequate performance even with a high number of active users. These receivers equalize the channel prior to the despreading, thus restoring the orthogonality of users and resulting multiple access interference (MAI) suppression. In this paper, ideas of generalized side-lobe canceler (GSC) and minimum output energy (MOE) are applied to the adaptation of downlink channel equalizer. The performance of the adaptation scheme is compared to the performance of conventional Rake receiver as well as to the performance of equalizer adapted with Griffiths&amp;apos; algorithm. Numerical results show significant performance gain over Rake receiver and some performance gain over the Griffiths &amp;apos; algorithm in a fading channel.

Cited by 0

Neural Conjuncted Polynomial's Structure Adaptive Equalizer

Haiquan Zhao, Jiashu Zhang · 2007

Based on the analysis of linear conjuncted polynomial filter and the characteristic of single layer neural network with mild nonlinear and severe nonlinear distortions, novel conjunction's structure equalizer is proposed in this paper, and adaptive algorithm is deduced by the normalized least mean squares (NLMS). Computer simulations show that not only the novel type structure equalizer is simpler in structure and but also can availably remove nonlinear distortions and intersymbol interference (ISI), improve performance of bit error rates (BER) no matter what linear channel or nonlinear channel in digital communication systems.

Cited by 0

Ferroelectric Capacitor based Adaptive Differential Equalizer

Dubari Borah, Aarushi Gupta, T. S. Kalkur · 2020

In this paper, a novel architecture of passive adaptive differential equalizer is reported. The proposed architecture has a fixed PCB layout, yet it provides bandwidth control of the frequency response using a ferroelectric tunable capacitor. The equalizer circuit occupies an area of 5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and demonstrates a wide tuning range of 1 GHz for a DC bias range of 1-10V.

Cited by 2

A Review on Adaptive Equalizer Algorithms

Rz 988 1A Street No. 16 B Sadh Nagar Palam Colony New Delhi 110045, Sumit Bhardwaj, DR.Vinod Shokeen et al. · International Journal of Scientific Research · 2012

Today’s wireless world demands transmitting data without noise. Additive white Gaussian noise(AWGN) gets added to the signal and however due to the presence of multipath channel and band limited channel time spread symbols reaches the receiver and act as noise for subsequent symbols giving rise to intersymbol interference(ISI). Thus the most favored solution to this problem is use Adaptive Equalizer. In this paper we will discuss in brief about the Adaptive equalizer and main algorithms used by equalizer. A Review on Adaptive Equalizer Algorithms

Cited by 1Open access

Hyperstable adaptive recursive decision feedback equalizer

Arun Sekar Rajasekaran, F. Cornett · 2003

An adaptive recursive decision feedback equalizer (ARDFE) which utilizes the hyperstable adaptive recursive filter algorithm is described. The ARDFE is named as the hyperstable adaptive recursive decision feedback equalizer (HARDFE). The authors deal with the theoretical analysis of the HARDFE algorithm. To prove the correctness of the theoretical derivations, a comparison of the analytical results and the results from the computer simulations is given.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Cited by 0