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Consumer Electronics, IEEE Transactions on

Issue 4 • Date November 2010

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Displaying Results 1 - 25 of 118
  • IEEE Transactions on Consumer Electronics - Table of contents

    Page(s): c1
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    Freely Available from IEEE
  • [Society & Staff]

    Page(s): c2
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    Freely Available from IEEE
  • Message from the editor: looking back and looking forward

    Page(s): i
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    Freely Available from IEEE
  • IEEE Consumer Electronics Society Officers and Committee Chairs

    Page(s): ii
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    Freely Available from IEEE
  • Effect of nanoparticle phosphors on the luminous efficiency in PDP

    Page(s): 2023 - 2026
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (146 KB) |  | HTML iconHTML  

    Investigation into plasma display panel discharge cells has developed over the last few years and has given researchers an insight into luminance efficiency. This paper discusses the effect of both the area size of the microcell discharge and phosphor on luminous efficiency. Simulation results show that by creating regular or irregular nano scale holes increases areal density of phosphors. However, the optical property of phosphor in nano scale has shown to be changed. These two advantages lead to an increase in luminous efficiency by 14 per cent compared with the conventional plasma display panel cell. View full abstract»

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  • Adaptive unsymmetrical dither region to improve dynamic false contour in PDPs

    Page(s): 2027 - 2031
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (171 KB) |  | HTML iconHTML  

    Because dynamic false contour (DFC) can be improved by selecting a limited number of gray scales in plasma display panels (PDPs), the other gray scales unselected are realized by dither. In order to reduce the noises caused by dither, a method using adaptive unsymmetrical dither region in which DFC may occur is proposed. The evaluated method with vision characteristic for DFC is obtained firstly after analyzing the luminance distribution of DFC stripe. Then the dither widths of bright and dark DFC stripe regions to realize gray scales are computed and changed according to the degree of the vision sensitivity to DFC. The experiment results show that the width of dither region can change and keep the minimum adaptively according to the degree of vision sensitivity to DFC. The gray scales are expressed smoothly, simultaneously. The peak signal noise ratio (PSNR) of image displayed in this method is better than other methods. View full abstract»

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  • A 1.62/2.7Gbps clock and data recovery with pattern based frequency detector for displayport

    Page(s): 2032 - 2036
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1635 KB) |  | HTML iconHTML  

    A clock and data recovery (CDR) for the physical layer of DisplayPort at sink side is described. A 1/5-rate linear phase detector (PD) compares the phase of the incoming data with that of sampling clock to recover a clean clock and data. A pattern based frequency detector (PBFD) reduces frequency error to be in the pullin-range of the 1/5-rate linear PD. The PBFD reduces the frequency error down to 3.2% before the linear PD starts its operation. The CDR implemented in a 0.13 m CMOS process shows 29-ps rms and 154-ps peak-to-peak jitter in the recovered clock and 10-7 bit error rate (BER) for 231-1 pseudorandom binary-sequence (PRBS) input while consuming 87mW from a 1.2-V supply. View full abstract»

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  • Cost effective design and implementation of scanning-based LED backlight for LCD module

    Page(s): 2037 - 2042
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (379 KB) |  | HTML iconHTML  

    Blurring effects in liquid crystal display can be observed in motion pictures if the response time of the liquid crystal molecules is not fast enough. In this study, a cost-effective architecture for backlight control system is proposed with scanning based method. A backlight control process employed with sequential lighting of the backlit pixels to reduce the blurring effects on LCD. Based on the sequential control, a 42-inch white light backlight module system with 1440 LED devices can be driven by only two driver chips. The prototyping backlight system had been implemented within one PCB in success. The measurement results from the laboratory demonstrate that the backlight system can save power dissipation and provide enough brightness for LCD. The proposed backlight system can be not only to reduce the implementation cost but also to shrink the driving broad size. The implementation cost can be reduced by about 70% compared with the conventional architecture. View full abstract»

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  • Programmed driving waveforms for quick-response liquid powder displays

    Page(s): 2043 - 2046
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (170 KB) |  | HTML iconHTML  

    A low optical contrast ratio is the major drawback of quick-response liquid powder displays (QRLPDs). In this paper, the electro-optical response of the QRLPD is analyzed, and better optical contrast is found to be obtained if the display is driven by pulse number modulation (PNM). However, PNM driving requires a longer driving duration. To achieve a successful trade-off between image contrast and driving duration, the QR-LPD requires a customized driving waveform. A programmed driving waveform and a design process are proposed. Experimental results show that the programmed driving waveform reduces the driving duration by up to 36.5% compared to conventional methods. View full abstract»

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  • A high-efficient sustain driver with low current stresses for plasma displays

    Page(s): 2047 - 2053
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1267 KB) |  | HTML iconHTML  

    A high-efficient sustain driver for plasma display panels is proposed to recover energy stored in the resonant inductors as well as in the panel capacitors. By simply rearranging the circuit components without any additional devices, the developed sustain circuit is configured to eliminate the extra conduction losses and the current stresses on switching devices caused by the reverse recovery operation of the diodes. The energy trapped in the resonant inductors due to the inevitable diode reverse-recovery phenomena, which generates extra conduction losses and thermal problem with circulating currents, is recovered to the energy recovery capacitors in the proposed circuit. Therefore, the sustain circuit of the proposed driver can obtain higher circuit efficiency and lower current stresses on the semiconductor components than prior approaches. View full abstract»

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  • A local dimming algorithm for low power LCD TVs using edge-type LED backlight

    Page(s): 2054 - 2060
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1289 KB) |  | HTML iconHTML  

    A local dimming algorithm is proposed to reduce the power consumption of LCD TVs using edge-type LED backlight. The proposed local dimming algorithm is implemented by matrix driving of orthogonally located LEDs at the edge of the backlight. The dimming rate of LED string is determined according to target luminance of local blocks and modified to reduce image distortion. The backlight power saving ratios of four typical images are 23.2-53.2 % and 30.2- 54.3% by using proposed division and rate algorithms, respectively. PSNR is greater than 48 dB using proposed local dimming algorithms. View full abstract»

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  • A power-of-two FFT algorithm and structure for DRM receiver

    Page(s): 2061 - 2066
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (173 KB) |  | HTML iconHTML  

    Digital Radio Mondiale (DRM) is the most important technology to replace analog AM broadcasting into digital one. The core of DRM is based on coded orthogonal frequency division multiplexing (COFDM), so it has high spectrum efficiency including the other advantages. Modern OFDM is based on discrete Fourier transform (DFT) or inverse discrete Fourier transform (IDFT). However, due to the particularity of DRM, the numbers of sub-carriers in four DRM robust modes are not same. And these numbers are nonpower- of-two. Typically, the fast Fourier transform (FFT) is based on a power-of-two algorithm. We do have some algorithms to compute the non-power-of-two FFT such as the prime-factor algorithm (PFA). However, these algorithms are complex and inconvenient to implement. Therefore, we propose a new algorithm and structure to use a power-of-two FFT algorithm in DRM receiver. This algorithm has low complexity, more general and flexible characteristics. In the end the paper gives out the bit error rate (BER) simulation results, these results indicate that the proposed algorithm's performance is same as the traditional one. View full abstract»

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  • Performance analysis of orthogonal signaling over fast fading channels

    Page(s): 2067 - 2071
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (194 KB) |  | HTML iconHTML  

    This paper analyzes the performance of a system consisting of a central base transmitter transmitting to a group of mobiles with on-off orthogonal modulation over a fast fading channel. Because the channel is changing across the symbol interval, inter-code interference appears at the output of each user's matched filter. The cumulative distribution function at one user's matched filter output is derived. From this distribution, a metric is introduced to evaluate which pairs of codes lead to the most severe inter-code interference for a particular fading spectrum. View full abstract»

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  • Low-cost FFT processor for DVB-T2 applications

    Page(s): 2072 - 2079
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (634 KB) |  | HTML iconHTML  

    An efficient Fast Fourier Transform (FFT) processor is greatly needed for real-time operation in many OFDM applications, such as xDSL, DAB, DVB-T/H, and etc. This paper presents a low-cost Parallel Memory-based FFT (PMB-FFT) processor for DVB-T2 applications. The processor has been designed and implemented in 90nm 1P9M CMOS process. Experimental results show that the PMB-FFT processor meets the DVB-T2 standard with N=32,768 points, and takes only 2.51 mm2 in the core area with a power consumption of 0.89 mW at 25MHz. View full abstract»

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  • Modeling of the transmission delay in bluetooth piconets under serial port profile

    Page(s): 2080 - 2085
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (170 KB) |  | HTML iconHTML  

    Bluetooth is a key connectivity technology for the deployment of wireless Personal Area Networks as far as it is the most popular low power communication feature incorporated in devices such as laptops or smartphones. This paper proposes an analytical model to predict the delay of the transmissions in Bluetooth piconets employing Serial Port Profile (SPP), which is massively implemented by Bluetoothenabled equipments. The characterization includes the impact of the overhead and the segmentation imposed by the different protocols involved in the transmission as well as the delay provoked by the polling process that is executed to regulate the activity of the different slaves in the piconet. The model has been empirically evaluated and tested in actual Bluetooth piconets. View full abstract»

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  • Natural language-based user interface for mobile devices with limited resources

    Page(s): 2086 - 2092
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB) |  | HTML iconHTML  

    In this paper, we propose a natural language-based interface model to enable a user to articulate a request without having any specific knowledge about a mobile device. In consideration of the very limited computing and memory capacity of the mobile device and to keep the development cost low, the proposed model does not depend on typical natural language techniques, but on a ranking technique, that is simplified based on the mathematical derivation process with the following assumptions. One assumption is that a device control command consists of a function and its parameters. The other assumption is that the parameter is represented as few predictable patterns, whereas the function can be represented as various sentence patterns. To deal with these various sentence patterns, the proposed model selects the top ranked command candidate with the highest score after generating all possible candidates with their scores. Furthermore, the ranking score function is designed to achieve a high discriminative capability by the simulation of the process of generating every candidate. Experimental results show that the proposed model with 2.9 megabytes performs at 96.27% accuracy, which is slightly lower than 97.06% of the baseline model with 135.2 megabytes. View full abstract»

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  • A novel feedforward active noise control structure with spectrum-tuning for residual noise

    Page(s): 2093 - 2097
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (461 KB) |  | HTML iconHTML  

    Active noise control (ANC) technology is becoming popular in consumer electronic products for audio applications. Typical ANC system aims primarily at reducing acoustic noise over the entire frequency band. However, human factors including diversity of individual listening preferences on spectral content and non-uniform characteristics of human hearing response in frequency domain require the capability of tuning the residual noise spectrum in ANC system. In this paper, we propose a new feedforward ANC structure featuring spectrum-tuning of the residual noise. Analysis shows that this new system has good tuning performance and little influence on system adaptation. Simulation results verify the effectiveness of the proposed system. View full abstract»

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  • An improved timing estimation method for OFDM systems

    Page(s): 2098 - 2105
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (403 KB) |  | HTML iconHTML  

    In this paper, we propose an improved timing estimation method for orthogonal frequency division multiplexing (OFDM) systems. The proposed preamble-aided method is independent of the preamble structure and is based on taking advantage of the whole products available from a given preamble for its correlation. Capable of having an extended correlation length far beyond those used by the previous methods, the proposed scheme presents an estimator with a remarkable performance in severe noise conditions. Further, we introduce a reduced complexity estimator along with the complexity assessments. We finally evaluate the performance of the proposed method in terms of mean square error (MSE). The results indicate that the new method significantly improves the performance compared to the previously presented methods. View full abstract»

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  • Impulse noise mitigation techniques for xDSL systems in a real environment

    Page(s): 2106 - 2114
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB) |  | HTML iconHTML  

    The demand for broadband communications for high data-rate applications has pushed towards the development of novel access technologies. Even if wireless access networks have gained more importance in the last years, wired access networks still remain the most common alternative for in-home access. In particular, xDSL technology allows a broadband access in domestic environment by exploiting the already deployed Public Switched Telephone Network (PSTN). Within this scenario, one of the most significant drawbacks is the presence of the impulse noise in wired connections. In particular, this is fundamental whenever xDSL is used for carrying high data rate real-time services (e.g., video streaming). Aims of this paper are to present results derived by a measurement campaign over an actual SOHO telephone line and, in addition to this, to propose a suitable detection and mitigation technique for applications in xDSL in-home receivers. Performance comparisons with alternative techniques will be also provided by focusing on real impulses as result of an actual measurement campaign to validate the effectiveness of the proposed solutions. View full abstract»

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  • Performance evaluation of mobile DAB receivers in enhanced packet mode

    Page(s): 2115 - 2122
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (293 KB) |  | HTML iconHTML  

    This paper describes the bit error rate (BER) performance of the Enhanced Packet Mode (EPM) of the Eureka 147 Digital Audio Broadcast (DAB) system in a mobile environment. The BER performance of DAB-EPM is characterized by computer simulations in frequency selective (typical case) and flat faded (worst case) mobile channels. For each of these channels, simulations are performed at vehicle speeds ranging from very slow (walking speed) to very fast (high speed trains). Simulation results show that, in typical frequency selective mobile environments, the target BER of 10 8 required to deliver adequate packet data service via the EPM is achieved at Carrier to Noise Ratio (C/N) values smaller than the target value of 14 dB used in coverage and frequency planning at most of the vehicle speeds tested. Moreover, the coverage area of packet data services is equivalent to the coverage of audio services delivered with the MPEG Layer 2 audio codec and the Unequal Error Protection Level 3 of DAB. View full abstract»

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  • UWB-FSK: performance tradeoffs for high and low complexity receivers

    Page(s): 2123 - 2131
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (171 KB) |  | HTML iconHTML  

    In this work we explore flexible modulations to allow demodulation using receivers with different complexity and cost. More specifically, we study pulse-based ultra wideband (UWB) communications over channels with dense multipath effects using frequency shift keying (FSK) data modulation. Our aim is to explore the performance tradeoffs between high and low complexity receivers. For this purpose we determine the performance of coherent, non-coherent and mismatched (e.g., non-coherent detection using templates consisting of a single path) demodulators. We take into account the influence of the frequency response of the antenna system and the effects of the frequency selectivity of the multipath channel. Given a specific channel condition, we derive expressions for the bit error rate for coherent, noncoherent and mismatched reception of correlated FSK signals with unequal energies, and calculate the signal-to-noise ratio (SNR) degradation for different receiver's complexities with a given FSK frequency deviation We show that UWB-FSK has a SNR degradation similar to other low-complexity receivers studied in the literature. View full abstract»

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  • Design and analyses of a fast feed-forward blind equalizer with two-stage generalized multilevel modulus and soft decision-directed scheme for high-order QAM cable downstream receivers

    Page(s): 2132 - 2140
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (283 KB) |  | HTML iconHTML  

    In the present study, a fast feed-forward blind equalizer with a two-stage generalized multilevel modulus algorithm (GMMA) and soft decision-directed (SDD) scheme was developed for high-order QAM cable receivers on broadcasting downstream wired cable channels. The proposed fast blind equalization algorithm uses a two-stage convergence strategy, and the modified SDD part applies an adaptively selected decision region. At the first convergence stage, joint GMMA and modified SDD equalization was applied for fast convergence. When the convergence process reached the steady state, the convergence detector changed the first equalization stage to the second stage. At the second stage, the modified SDD scheme reduced the mean square error (MSE) further. To prove the convergence, MSE analyses of two-stage GMMA+SDD /SDD blind equalization in the steady state were conducted. On the wired cable channel at 64, 256, and 1024QAM modes, the proposed blind algorithm had a faster convergence speed than previous blind methods. The proposed algorithm also achieved a smaller MSE than the other methods at the same signal-to-noise ratio (SNR). When the proposed method used the architecture of the decision-feedback equalizer (DFE) with a SDD-based feedback FIR filter (FBF), the steady-state MSE and bit-error-rate (BER) decreased further. View full abstract»

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  • Synchronization for TDS-OFDM over multipath fading channels

    Page(s): 2141 - 2147
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB) |  | HTML iconHTML  

    Time domain synchronous orthogonal frequency division multiplex (TDS-OFDM) is an effective multi-carrier modulation scheme to improve the spectrum efficiency. However, conventional synchronization algorithm based on the correlation property of the time-domain pseudo-noise (PN) sequence may not work well over severe multipath fading channels when large carrier frequency offset (CFO) exits. In this paper, a robust synchronization algorithm is proposed where the PN sequence in the frame head is considered as a cyclic prefix (CP) OFDM training symbol. The time-domain slide auto-correlation based on the cyclic structure of the PN sequence is adopted for timing and fine CFO estimation, while in the frequency domain, a differential correlation is applied for large CFO estimation. Simulations demonstrate that the proposed method could achieve the satisfactory performance over multipath fading channels. In addition, to reduce the implementation complexity, the frame head of the TDS-OFDM system is preferred to be binary PN sequences in the frequency domain with cyclic structure in the time domain. View full abstract»

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  • An efficient iterative frequency domain equalization for ATSC DTV receiver

    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (931 KB) |  | HTML iconHTML  

    In this paper, we present an efficient single carrier frequency domain equalization for Advanced Television Systems Committee (ATSC) digital television receiver. The proposed scheme employs iterative cyclic prefix reconstruction (CPR) combined with block-overlapping process to reduce inter-carrier interference (ICI) component caused by the absence of cyclic prefix in multipath fading channel. In addition, trellis decoder aided iterative decision feedback frequency domain equalizer is derived to further mitigate inter-symbol interference (ISI). Finally, low-complex iterative frequency domain channel estimation is proposed to predict and track the time-varying multipath fading channel coefficients. The computer simulation results reveal that the proposed scheme has a significant performance improvement in multipath fading channel with respect to the previous time domain equalization (TDE) and frequency domain equalization (FDE). View full abstract»

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  • Low-cost integer frequency offset estimation for OFDM-based DRM receiver

    Page(s): 2155 - 2160
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (198 KB) |  | HTML iconHTML  

    In this paper, we propose an improved and low-cost integer frequency offset (IFO) estimation method by partitioning pilot symbols effectively in an orthogonal frequency division multiplexing based digital radio mondiale (DRM) system. To this end, the time reference cell (TRC) symbol for frequency estimation is grouped into a number of pilot clusters, so that the TRC subcarriers in each cluster are closely spaced to show approximately frequency-nonselective characteristics. The performance of the proposed IFO estimator is compared with that of the conventional estimator, and shows that the proposed technique can effectively achieve lower estimation errors in frequency offset estimation as well as can be implemented with reduced computational complexity. View full abstract»

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Aims & Scope

The primary purpose for publishing the Transactions of the Consumer Electronics Society is to present to the membership and the engineering community in general, papers on new technology oriented to Consumer Electronics.

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
R. Simon Sherratt
School Director for Teaching and Learning, School of Systems Engineering
The University of Reading
Reading, Berkshire  RG6 6AY  RG6 6AY  U.K.
r.s.sherratt@reading.ac.uk; sherratt@ieee.org
Phone:+44 (0) 118 3788588
Fax:+44 (0) 118 3788583