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Consumer Electronics, IEEE Transactions on

Issue 1 • Date Feb 2004

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Displaying Results 1 - 25 of 64
  • A novel cost effective demosaicing approach

    Publication Year: 2004 , Page(s): 256 - 261
    Cited by:  Papers (37)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (755 KB) |  | HTML iconHTML  

    A unique color interpolation approach for digital still cameras is introduced and described in terms of color vectors. A new difference plane model is introduced and used in conjunction with the proposed here correction process. This avoids edge blurring while improving on the color appearance of previous methods. Experimental results indicate that the proposed method exhibits superior performance over state of-the-art color interpolation methods. View full abstract»

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  • Positioning Bluetooth® and Wi-Fi™ systems

    Publication Year: 2004 , Page(s): 151 - 157
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1022 KB) |  | HTML iconHTML  

    A comparative analysis is made between two growing public interest wireless systems, namely: Bluetooth and Wi-Fi. Key system elements are identified and listed to highlight contrasts and convergences and provide guidance in the usage of these systems in several application areas. The analysis covers historical background, targeted usage models, architectural notions, market trends and general considerations for both systems. Concluding remarks indicate that both systems are complementary to each other rather than competitors. View full abstract»

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  • Fundamental analysis for visible-light communication system using LED lights

    Publication Year: 2004 , Page(s): 100 - 107
    Cited by:  Papers (289)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1620 KB) |  | HTML iconHTML  

    White LED offers advantageous properties such as high brightness, reliability, lower power consumption and long lifetime. White LEDs are expected to serve in the next generation of lamps. An indoor visible-light communication system utilizing white LED lights has been proposed from our laboratory. In the proposed system, these devices are used not only for illuminating rooms but also for an optical wireless communication system. Generally, plural lights are installed in our room. So, their optical path difference must be considered. In this paper, we discuss about the influence of interference and reflection. Based on numerical analyses, we show that the system is expected to be the indoor communication of the next generation. View full abstract»

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  • Interference cancellation for OFDM systems in presence of overlapped narrow band transmission system

    Publication Year: 2004 , Page(s): 108 - 114
    Cited by:  Papers (6)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (564 KB) |  | HTML iconHTML  

    Narrowband interference (NBI) is one of the most important problems in an OFDM system, which not only degrades the signal performance on the overlapped subcarriers, but also affects the signal performance on the nearby subchannels due to the spectral leakage effect of DFT demodulation at the receiver. In this paper, we consider the NBI problem caused by narrow band digital communication systems, and propose a novel NBI cancellation method. We consider the NBI reconstruction problem including NBI central frequency and its bandwidth estimation. Simulation results show that this method can achieve about 6 dB signal to interference plus noise ratio (SINR) gain if the interference bandwidth is about twice of that OFDM bins and the system SINR is about 0 dB. As the bandwidth of NBI decreases, more SINR gain will be obtained. Meanwhile, we also consider the system implementation problem, it has shown that its implementation complexity is not high based on the current digital signal processing techniques. If zoom FFT is employed in our system, the calculation complexity can he reduced considerably. View full abstract»

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  • A shared cache solution for the home Internet gateway

    Publication Year: 2004 , Page(s): 168 - 172
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (417 KB) |  | HTML iconHTML  

    With the advent of multiple PCs and smart appliances into the modern houses, home networking is becoming increasingly important. Caching at the home Internet gateway is an effective way to maximize the performance of home networking. In this paper, we present an efficient caching scheme that allows the sharing of caches among nearby home Internet gateways. Our new scheme reduces the duplicated copies of the same data items in total shared caches. It also reduces the message overhead of existing cache sharing schemes significantly. Prototype implementation and trace-driven simulations with actual Internet access traces show that the proposed cache sharing scheme outperforms the two well-known Web cache sharing schemes, the Internet cache protocol (ICP) and the cache array routing protocol (CARP) in terms of various performance measures. View full abstract»

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  • Optimal frame memory and data transfer scheme for MPEG-4 shape coding

    Publication Year: 2004 , Page(s): 342 - 348
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (650 KB) |  | HTML iconHTML  

    An optimal frame memory and data transfer scheme is proposed for MPEG-4 shape coding in embedded systems. The proposed alpha frame buffer scheme contains two approaches. First, a distributed tile-based memory organization is used to efficiently support the time-varying size of alpha plane. Second, a compression scheme is used to reduce the number of memory access to and the size of the alpha frame memory. Under the criteria of MPEG-4 standard, the size of alpha frame memory can be reduced to 50% by introducing a small index table (2.73%-5.08% of the original frame memory size). A coarse assessment shows that the number of memory reference can be reduced to 56.25%. On the other hand, the proposed data transfer scheme combines the run length coding and addressing mode to reduce average data transfer time to 9.39%. Therefore, the shared system bus can be kept as free as possible, which in turn leads to increasing the potentialities of improvement on system performance. Furthermore, this data transfer scheme also helps in accelerating the processing of shape coding. View full abstract»

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  • A Vario-power ME architecture using content-based subsample algorithm

    Publication Year: 2004 , Page(s): 349 - 354
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (517 KB) |  | HTML iconHTML  

    The motion estimator is a key element in many video compression systems and it tends to dominate the power consumption in them. With increasing demand of portable, power-aware multimedia devices, an architecture that can be flexible in both power consumption and compression quality is essential. To meet this requirement, this paper presents a novel power-aware architecture, called the Vario-power architecture, for the motion estimation. Based on a semi-systolic array with the content-based subsample algorithm, the architecture real-time disables some processing elements to reduce power consumption. By performing the edge extraction first, a threshold is then set as the criterion of whether to enable or disable processing elements and thus the switch activities of the system can be reduced. As the simulation shows, the architecture may operate at different power consumption modes according to the remaining capacity of the battery pack giving little quality degradation and the power overhead under 0.36%. View full abstract»

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  • Low-power multiplierless DCT architecture using image correlation

    Publication Year: 2004 , Page(s): 262 - 267
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1933 KB) |  | HTML iconHTML  

    Low-power design is one of the most important challenges to maximize battery life in portable devices and to save the energy during system operation. In this paper, we propose a low-power DCT (discrete cosine transform) architecture using a modified multiplierless CORDIC (coordinate rotation digital computer) arithmetic. The switching power consumption is reduced during DCT: the proposed architecture does not perform arithmetic operations of unnecessary bits during the CORDlC calculations. The experiment results show that we can reduce up to 26.1% power dissipation without compromise of the final DCT results. Also, the speed of the proposed architecture is increased about 10%. The proposed low-power DCT architecture can be applied to consumer electronics and portable multimedia systems requiring high throughput and low-power. View full abstract»

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  • A novel uplink channel estimation in OFDM-CDMA systems

    Publication Year: 2004 , Page(s): 125 - 129
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (582 KB) |  | HTML iconHTML  

    Orthogonal frequency division multiplexing-code division multiplex access (OFDM-CDMA) is one of the best candidates for the future broadband wireless multimedia communication systems. This paper proposes a novel channel estimation algorithm for OFDM-CDMA systems on the uplink. With reasonable constraint and well-designed preambles for each user, the DFT-based uplink channel estimation algorithm can achieve good estimation accuracy without sacrificing much system overhead. Computer simulation demonstrates effectiveness of this method and conclusion is followed. View full abstract»

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  • A soft decision decoding scheme for wireless COFDM with application to DVB-T

    Publication Year: 2004 , Page(s): 84 - 88
    Cited by:  Papers (10)  |  Patents (34)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (585 KB) |  | HTML iconHTML  

    This paper investigates the soft decision decoding techniques for wireless COFDM systems. A new method to estimate the channel state information (CSI) for the Viterbi decoder is proposed, which overcomes the problem of reliability metric of transmitted signals in wireless as well as mobile channels. The CSI for each subcarrier is calculated as a properly defined squared Euclidean distance. On the basis of which, a soft decision decoding scheme to improve reception performance under multipath fading interference and co-channel interference (CCI) from existing analog broadcasting signals is also proposed. The simulation results show that the scheme can provide a compatible improvement to the terrestrial digital video broadcasting (DVB-T) system. The proposed scheme is also suitable for other wireless COFDM transmission systems. View full abstract»

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  • Managing multimedia data services with multiple ensemble decoding architecture in digital audio broadcasting system

    Publication Year: 2004 , Page(s): 274 - 280
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1086 KB) |  | HTML iconHTML  

    This paper proposes the architecture of multiple ensemble service in DAB network, in which they can transmit and receive more than one ensemble through multiple transmitters, which covers the same service area. Using this architecture, ensemble providers and transmission network providers have more flexible management environment of DAB networks as well as they can accommodate more than 1.5 Mbps data capacity limit of one ensemble. View full abstract»

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  • An efficiently revised sustain driver for AC plasma display

    Publication Year: 2004 , Page(s): 8 - 14
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB) |  | HTML iconHTML  

    A new sustain driver employing a step-up function is presented to achieve the faster rise-time of sustain voltage, which Ls suitable for widely used address-and-display-period-separated (ADS) driving method, and most of all for cost saving. The proposed sustain driver can reduce the number of switching devices by 25 (%) compared to the prior approach improving the overall system efficiency about 10 (%). And brightness decrease problem resulted from the lack of the number of the sustain pulse can be solved without a limitation to sustain pulse width. Operational principle and its features are illustrated comparing with conventional approaches. The validity of the proposed sustain driver is verified through experiments using a prototype equipped with a 7.5 (inch) diagonal panel, which is operated at 200 (kHz) switching frequency. View full abstract»

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  • Design and implementation of a private and public key crypto processor and its application to a security system

    Publication Year: 2004 , Page(s): 214 - 224
    Cited by:  Papers (8)  |  Patents (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (836 KB) |  | HTML iconHTML  

    This paper presents the design and implementation of a crypto processor, a special-purpose microprocessor optimized for the execution of cryptography algorithms. This crypto processor can be used for various security applications such as storage devices, embedded systems, network routers, security gateways using IPSec and SSL protocol, etc. The crypto processor consists of a 32-bit RISC processor block and coprocessor blocks dedicated to the AES, KASUMI, SEED, triple-DES private key crypto algorithms and ECC and RSA public key crypto algorithm. The dedicated coprocessor block permits fast execution of encryption, decryption, and key scheduling operations. The 32-bit RISC processor block can be used to execute various crypto algorithms such as Hash and other application programs such as user authentication and IC card interface. The crypto processor has been designed and implemented using an FPGA, and some parts of crypto algorithms has been fabricated as a single VLSI chip using 0.5 μm CMOS technology. To test and demonstrate the capabilities of this chip, a custom board providing real-time data security for a data storage device has been developed. View full abstract»

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  • Home automation network supporting plug-and-play

    Publication Year: 2004 , Page(s): 173 - 179
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (565 KB) |  | HTML iconHTML  

    Degree of acceptance to a home automation network by the consumers depends greatly on how easy it is to use. Plug-and-play is a good way. In this paper, a home automation network which has a five-layer protocol, appliance profiles, and a hand-held remote controller to support PnP is proposed. Its five-layer protocol model is discussed, the detailed specification of the three layers supporting PnP is presented, and an example is given to demonstrate how PnP works. View full abstract»

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  • An implementation of wireless sensor network

    Publication Year: 2004 , Page(s): 236 - 244
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (763 KB) |  | HTML iconHTML  

    In recent years, the advances in wireless communication and electronics have accelerated to develop many wireless network solutions to replace existing wired networks. A wireless network solution can support mobility and flexibility of nodes in a network. Especially in sensor networks, it has many advantages to replace cables with wireless logical links. On the other hand, Bluetooth is generally considered as a promising short-range wireless technology because of its inexpensive cost, low power and small size, and thus Bluetooth has been gaining increasing interest from various industries. For the above reasons, we adopt Bluetooth technology for a wireless sensor network, which is designed for security systems. Since Bluetooth will continue to be a feature found in many devices, it is worthwhile to investigate its use in wireless sensor networks. In this paper, we describe a Bluetooth wireless sensor network for security systems, which includes the implementation issues about system architecture, power management, self-configuration of network, and routing. We think that the methods or algorithms described in this paper can be easily applied to other embedded Bluetooth applications for wireless networks. View full abstract»

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  • A multi-loop voltage feedback filterless class-D switching audio amplifier using unipolar pulse-width-modulation

    Publication Year: 2004 , Page(s): 312 - 319
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (698 KB) |  | HTML iconHTML  

    Voltage feedback is frequently used in class-D switching audio power amplifiers. This paper discusses the design and implementation of a low-cost filterless class-D, unipolar pulse-width modulation switching audio amplifier having a multi-loop voltage feedback scheme. Classical frequency-compensation techniques are used to design and stabilize the three voltage feedback loops implemented in this application. This design method proves to be a cost-effective solution for designing high-fidelity (hi-fi) audio amplifiers. The cost is reduced because no output filter is used, the required switching frequency is half of the one needed if bipolar PWM was used, and no current sensor is needed for feedback purposes. The output impedance is extremely low due to the reduction of the successive voltage loops, making the amplifier less load dependent. Simulation results show that a total harmonic distortion (THD) of 0.005% can be achieved using this topology, as well as a flat frequency response, free of phase distortion in the audio band. Experimental results show the feasibility of this control scheme, since a THD of 0.05% was achieved with a laboratory prototyped amplifier. A comparison of the performance of this audio amplifier with that of some commercial class-D audio amplifiers, reveals that our design can seriously compete with some of the ICs leading the market at a lower cost. View full abstract»

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  • Frequency offset estimation for OFDM in wireless communications

    Publication Year: 2004 , Page(s): 73 - 77
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1017 KB) |  | HTML iconHTML  

    Timing jitter, frequency offset, carrier phase jitter and sampling clock frequency offset are the main synchronization errors encountered by OFDM systems. As many literatures have proved, OFDM systems are very sensitive to frequency errors. In this paper, three new methods to estimate the integer part of frequency offset are proposed, simulation results show its robustness to mitigate the multi-path effect and its enlarged estimation range for frequency offset. The correspondent field programmable gate array (FPGA) circuit through test in HDTV prototype in Team of Engineering Expert Group (TEEG) proves its feasibility and availability. The proposed method is also suitable for burst mode transmission systems such as wireless local area network (WLAN) and fixed-broadband wireless access (F-BWA). View full abstract»

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  • Algorithmic optimizations for software-only MPEG-2 encoding

    Publication Year: 2004 , Page(s): 366 - 375
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (558 KB) |  | HTML iconHTML  

    Till recently dedicated hardware has been required to perform real-time MPEG-2 video encoding. However, with increase in clock frequency and the introduction of video-specific instruction sets, general-purpose processors and DSPs can now approximate the function and performance of single-function hardware. In this paper, a software-only MPEG-2(MP@ML) video encoder implementation aimed at real-time operation on embedded platforms and general-purpose processors is described. The main contribution of this work is a set of algorithmic optimizations that significantly reduces the computational complexity of the encoding process while slightly degrading the subjective video quality compared to encoders that are more exhaustive. View full abstract»

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  • WAP-teletext system

    Publication Year: 2004 , Page(s): 130 - 138
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (566 KB) |  | HTML iconHTML  

    The evolution of the Internet has linked the entire world together and revolutionized the way people communicate and exchange information. Wireless application protocol (WAP) further bridges the gaps by allowing people to link to the Internet through a mobile device. This paper introduces the concepts, and presents the methodology for the implementation of teletext WAP access system. The system converts the Teletext pages from the conventional TV screen format to WAP enabled handphone (WEHP) screen format, and stores in teletext-WAP database. A WAP enabled hand phone is able to access this database and display the information on its screen. The implementation of teletext-WAP site using active server pages (ASP) with wireless markup language (WML) is described in this paper. View full abstract»

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  • Requirements and referential software architecture for home server based inter-home multimedia collaboration services

    Publication Year: 2004 , Page(s): 145 - 150
    Cited by:  Papers (1)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (558 KB) |  | HTML iconHTML  

    This paper presents requirements and referential software architecture for home server based multimedia collaboration services. The architecture can be applied to home servers and mobile devices for collaborative works such as voice over Internet protocol, collaborative web browsing, file transmission, and instant messaging. View full abstract»

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  • Dummy sequence insertion (DSI) for PAPR reduction in the OFDM communication system

    Publication Year: 2004 , Page(s): 89 - 94
    Cited by:  Papers (34)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (856 KB) |  | HTML iconHTML  

    OFDM communications system is very useful for the high data rate transmission. However, power efficiency of HPA (high power amplifier) is very poor, since there should be a large back-off because of the high PAPR (peak-to-average power ratio) of the OFDM signal. Otherwise, OFDM signal may be distorted by the nonlinear HPA. In this paper, we propose a DSI (dummy sequence insertion) method for PAPR reduction. The complementary sequence and the combination of the correlation sequence belong to the dummy sequence. Flipping technique can be combined into DSI method to effectively lower the PAPR reduction. Also, PAPR threshold technique escalates the processing speed. Unlike the conventional PTS (partial transmit sequence) and SLM (selected mapping) methods, the specified dummy sequence is inserted only for PAPR reduction and any kind of side information is not necessary. So, BER of the DSI method is independent of the error in the dummy data sequence. Although the DSI method is not better than the conventional PTS and block coding methods with respect to the PAPR reduction performance, the DSI method improves the BER performance than the conventional PTS and is even more spectrally efficient than the conventional block coding for PAPR reduction. View full abstract»

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  • Automated estimation of misconvergence in color monitors

    Publication Year: 2004 , Page(s): 39 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (515 KB) |  | HTML iconHTML  

    The cathode ray tube (CRT) monitor consists of alternating patterns of red, green and blue color phosphor pixels at fixed spacing. Convergence relates to a monitor's ability to match red, green and blue colors to form white. The misconvergence or misalignment of the colors results in incorrect rendition of colors, particularly at the edges. Misconvergence is an important measure of the performance of a CRT monitor. This paper presents a technique for measuring misconvergence of a color monitor by processing monochrome images of specific patterns displayed on the monitor. The technique overcomes problems due to color cross talk, video/image jitter, and lens distortion. Also, the measurement time is shorter by an order of a magnitude over traditional methods, opening up possibilities for real time feedback for accurate alignment. View full abstract»

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  • Power minimization in a backlit TFT-LCD display by concurrent brightness and contrast scaling

    Publication Year: 2004 , Page(s): 25 - 32
    Cited by:  Papers (29)  |  Patents (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (648 KB) |  | HTML iconHTML  

    This paper presents a concurrent brightness and contrast scaling (CBCS) technique for a cold cathode fluorescent lamp (CCFL) back/it TFT-LCD display. The proposed technique aims at conserving power by reducing the backlight illumination while retaining the image fidelity through preservation of the image contrast. First, we explain how CCFL works and show how to model the non-linearity between its backlight illumination and power consumption. Next, we propose the contrast distortion metric to quantify the image quality loss after backlight scaling. Finally, we formulate and optimally solve the CBCS optimization problem subject to contrast distortion. Experimental results show that an average of 3.7X power saving can be achieved with only 10% of contrast distortion. View full abstract»

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  • Computational-complexity scalable motion estimation for mobile MPEG encoding

    Publication Year: 2004 , Page(s): 281 - 291
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (749 KB) |  | HTML iconHTML  

    Complexity scalability algorithms are important for mobile consumer devices using MPEG video coding, because they offer a trade-off between picture quality and the embedded available computational performance. This paper presents a new scalable three-stage motion estimation technique, which includes preprocessing of frames in display order and approximation of motion-vector fields using multiple temporal references. A quality refinement of the approximation is added as an optional stage. Furthermore, we present a new scalable motion-estimation algorithm, based on simple edge detection, for integration into the above-mentioned new three-stage motion estimation technique. The complete system provides a flexible framework with a large scalability range in computational effort, resulting in an output quality that scales up smoothly with the number of operations spent on the motion estimation process. Experiments show a scalable computational effort from below one SAD (sum of absolute difference) computation per macroblock up to 15 SAD computations, resulting in a global variation of 7.4 dB PSNR in picture quality (with the "Stefan" sequence). In high-quality operation, the new algorithm is comparable to (or even outperforms) a full-search motion estimation with a search window of 32×32 pixels. View full abstract»

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  • Techniques improving the transmission reliability in high-rate wireless LANs

    Publication Year: 2004 , Page(s): 64 - 72
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1139 KB) |  | HTML iconHTML  

    This paper presents frame synchronization and two frequency synchronization techniques for high-rate wireless LANs (local area networks). Also, to improve the reliable communication under the multipath fading channel, we propose the wireless LAN system employing the space-time code. The proposed frame synchronization technique using the threshold checking scheme is directly based on the correlation method. We then describe a coarse frequency synchronization technique combining two conventional synchronization techniques to estimate an integral frequency-offset and a frequency synchronization technique employing interpolation method to estimate the integral and fractional frequency- offsets at the same time, respectively. Finally, by simulation, the performance of the proposed techniques is evaluated. View full abstract»

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Aims & Scope

The main focus for the IEEE Transactions on Consumer Electronics is the engineering and research aspects of the theory, design, construction, manufacture or end use of mass market electronics, systems, software and services for consumers.

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
R. Simon Sherratt, IEEE Fellow
Professor of Consumer Electronics
School of Systems Engineering
The University of Reading
Reading, Berkshire RG6 6AY  U.K.
r.s.sherratt@reading.ac.uk; sherratt@ieee.org
Phone:+44 (0) 118 3788588