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Consumer Electronics, 2005. (ISCE 2005). Proceedings of the Ninth International Symposium on

Date 14-16 June 2005

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Displaying Results 1 - 25 of 107
  • A fast and adaptive interpolation method for video coding

    Page(s): 80 - 82
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (153 KB) |  | HTML iconHTML  

    Interpolation is a very important and computational intensive part in H.264 video codec. Compared to full-pel motion estimation, "finer" interpolation provides better motion compensation performance at the expense of increased complexity. This paper presents a fast adaptive interpolation technique that significantly reduces the interpolation operation required in video coding. Experimental results on typical video sequence demonstrate that the proposed algorithm is able to achieve up to 45% encoding time reduction with no PSNR loss or bitrate increase. View full abstract»

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  • Design of a residential gateway for tele-homecare systems

    Page(s): 291 - 295
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (317 KB) |  | HTML iconHTML  

    This paper proposed a novel architecture for tele-homecare system. The architecture of tele-homecare system includes four parts: wireless sensor node, residential gateway, diagnosis system and mobile SoC. Residential gateway, based on OSGi, is the hub of the tele-homecare system. It provides connectivity to the outside world of home network and deployment of medical services over wide area network to home network appliances. Vital signs sensing is achieved by wireless sensor node integrated with medical device. View full abstract»

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  • A 10-bit 2.5 mW 0.27 mm2 CMOS DAC with spike-free switching

    Page(s): 473 - 477
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (223 KB) |  | HTML iconHTML  

    A low-power digital-to-analog converter for portable electronics is introduced A fully segmented architecture with a spike-free current mirror is presented to improve the INL/DNL and reduce the power consumption of the high-speed current steering DAC. The presented 10-bit DAC have been implemented in 0.18 μm 1P6M CMOS standard technology, and its core area is 0.27 mm2. The simulation results show the DNL/INL is ±0.14/0.14 at a conversion rate of 10 MHz, and consume 2.5 mW of power from a 1.8 V supply voltage. View full abstract»

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  • Development of a low complexity image compression engine on the stamp 2 module

    Page(s): 258 - 260
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (270 KB) |  | HTML iconHTML  

    Recently, adaptive decimation had been proven to be feasible in compressing images with good visual quality and at low bit-rate. The method had later been modified, through the use of look-up table, to reduce the computation loading so that it could be executed in real time on medium speed processors. A major disadvantage of this approach is the requirement of considerable quantity of RAM or ROM for recording the pre-computed data. In this paper, a novel scheme for overcoming this problem was reported. The revised method had enabled the adaptive decimation to be implemented in the stamp 2 module, a development kit which had been widely adopted by users of different disciplines in building simple control systems. View full abstract»

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  • Automobile lane detection system-on-chip integrated with mixed signal mode CMOS image sensor

    Page(s): 320 - 323
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB) |  | HTML iconHTML  

    In this paper, we aim at developing a system-on-chip, SoC, which can capture image as well as produce vehicle lane map at the same time. We adopt peak-finding based lane detection algorithm that can achieve high recognition rate about 96% even under various weather conditions. The features of the proposed SoC are a single low-cost and compact chip which implements the lane detection algorithm with mixed signal mode CMOS image sensor. Therefore, it can be easily used in thousands of consumer electronics for applications. View full abstract»

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  • Transceiver design and analysis of DS-CDMA ultra-wideband radio for next generation WPAN

    Page(s): 261 - 266
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (317 KB) |  | HTML iconHTML  

    This paper investigates a transceiver design and analysis of DS-CDMA Ultra-wideband radio, which is adapted from an 802.15.3a OWE draft proposal for WPAN. The system uses M-ary bi-orthogonal keying modulation with ternary spreading code. The 802.15.3a Saleh-Valenzuela CMI-CM4 channel models are specified for performance evaluation. For channel dispersion over many consecutive symbols, we use not only rake receiver to compensate the inter-chip interference, but also decision feedback equalizer to eliminate the post-cursor inter-symbol interference. Moreover, using the Gaussian approximation technique, analytic upper-bound error performance is derived for the rake-only and rake-DFE receiver. The result is well matched to the simulation result. It also shows that the Rake-DFE attains a significant performance gain as compared to the rake-only receiver. View full abstract»

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  • A cache management policy in proxy server for an efficient multimedia streaming service

    Page(s): 64 - 68
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (257 KB) |  | HTML iconHTML  

    In this paper, we present a cache management policy to efficiently store the videos in a proxy server. The objective of cache management policy is to maximize the quality of service (QoS) to interested clients by improving the hit rate of popular videos. Our cache management policy is based on capturing the changing preference of the videos according to recentness, frequency, and playback length of the requested videos. For this purpose, we define a parameter, access time, which represents the total playback time of video within a predefined interval. We also utilize the time popularity (TP) that denotes the number of client access to the each video within a predefined interval. Using the access time and TP, we can estimate a maximum available space of a video which means the maximum size of storage space to be allocated to the video. Our simulation results show that the bit rate of the proposed method is greater than the previous works. The simulation results show that the proposed algorithm performs better than other algorithm such as LRU, LFU, and TP methods in terms of packet bit rate in random access pattern and Zipf distribution access pattern. View full abstract»

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  • The study and application of key techniques on short distance wireless networks

    Page(s): 428 - 431
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (239 KB) |  | HTML iconHTML  

    The applications of data and voice access are presented in this paper. In the voice access application, the design scheme of Bluetooth PSTN access device is proposed, including Bluetooth PSTN gateway and Bluetooth 3-in-1 phone. In the data access application, a smart vehicle management system based on Bluetooth technology is presented. Two adopted protocols, RFCOMM and TCS, are designed to solve the compatible problem of application to tradition protocols in our demo systems and products based on Bluetooth. View full abstract»

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  • Real-time implementation of G.723.1A/G.729AB on a RISC processor for personal IP telephony devices

    Page(s): 20 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (299 KB) |  | HTML iconHTML  

    This paper describes implementation of international standard speech coders for IP telephony using an ARM processor. To implement the low bit-rate speech coders on real-time, we utilize compiler option, intrinsic functions, C code optimization and fast algorithms. Finally we applied optimized software codecs to IP phones and measured CPU usages of the coders. Experimental results showed that the optimised codecs can perform encoding and decoding simultaneously on real-time using a single ARM926EJ-S. View full abstract»

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  • Implementation of H.264/MPEG-4 AVC in low cost set top boxes

    Page(s): 310 - 314
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (293 KB) |  | HTML iconHTML  

    In 2003 a combined task force of International Organization for Standardization (ISO) and the International Telecommunication Union (ITU) developed the new video coding scheme called H.264/AVC also know as MPEG-4 part 10. This new coding scheme supports a wide array of different formats and application ranging from small displays of mobile phones to the large high definition displays in our future living rooms. Given that H.264/AVC significantly improves the quality of coded video signals, at a given data rate when compared to the existing MPEG-2 standard, there is a considerable interest in the consumer industry for devices supporting H.264/AVC. However, the business case for video processing in consumer devices can be extremely cost sensitive. This applies especially to the transmission of video over broadband, where the cost of the set-top box (STB) is a major part of the investment for the operator. To be economically viable, the H.264/AVC enabled STB for video over broadband must be as low-cost as possible. In this paper the various technical options for the implementation of H.2 64/AVC available in 2003 and their development over time are discussed. In this document the focus is on STBs supporting video over broadband channels with standard resolution (SD). The solution chosen by the author and the resulting STB developed by Siemens AG is presented. View full abstract»

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  • ADC systems for SDR digital front-end

    Page(s): 359 - 363
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    This paper describes the various issues related to the analog-to-digital (A-D) conversion process performed in a software defined radio (SDR). An architecture that may be suitable for the digital front end of a multiband, multimode SDR is proposed. Implementation considerations based on current analog-to-digital converter (ADC) technologies are discussed, together with digital signal processing techniques that can be applied to enhance the A-D process. Combination of time-interleaved ADCs with multirate polyphase filters banks to perform the channelization while reducing the matching difficulties encountered in time-interleaved ADC systems is also suggested. View full abstract»

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  • User-centric digital home photo album

    Page(s): 226 - 229
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (290 KB) |  | HTML iconHTML  

    In this paper, we propose a provision of user-centric home photo album system and albuming functions to support it. The main idea of the user-centric photo album is to enable users to organize and browse their photos along the semantically meaningful axes that are situation, person-identity, and category. Experiment results showed that the proposed method would be useful to album photos based on human perception. View full abstract»

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  • Two-dimensional modulation transfer function model based on visual characteristics for display images with Bayer-type pixel structure

    Page(s): 307 - 309
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (131 KB) |  | HTML iconHTML  

    This paper describes an assimilation phenomenon on monochrome images divided from the size of patterns, and proposes an analytical model about this phenomenon. The frequency spectrum of a sample pattern by the discrete Fourier transform and human visual characteristics by the Butterworth type low pass filter (LPF) are formulized. A two-dimensional model of the relation between the samples and human visual characteristics, which is additionally introduced the concept of a noise level is proposed, and discussed with the assimilation phenomenon qualitatively and quantitatively. Then, a comparative examination of this model is carried out by subjective evaluation, using the visual distance, and the validity is verified. As a result, the analysis using this proposal model, the cut-off frequency of this LPF is set to 20 cycles/degree, its attenuation is set to -20 dB/decade, and the noise level presumes -50 dB. The results almost conformed qualitatively to the results of evaluation experiments in this example. View full abstract»

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  • Use and interface definition of mobile RFID reader integrated in a smart phone

    Page(s): 353 - 358
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (407 KB) |  | HTML iconHTML  

    Consumers' demand for information about potential purchases has significantly increased in recent years. The possibility of checking product related information before making purchasing decisions is likely to be one of the key factors in market share competition. RFID (radio frequency identification) technology together with wireless communication technologies form a promising and competitive combination to realise this need. In this paper, we present and analyse a user interface (UI) of an RFID reader integrated in a smart mobile phone. User requirements, information management and consumer process flow are described and analysed. Further, an example of a reader UI is introduced. View full abstract»

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  • Atomic write FTL for robust flash file system

    Page(s): 155 - 160
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (347 KB) |  | HTML iconHTML  

    Flash memory is one of the essential elements for code and data storage in the mobile products. Robustness is very important in the flash memory based file system of the mobile consumer electronic devices, since sudden power failure may happen and it may cause a loss of important user data and a serious trouble which cannot be recovered by user. In this paper, we present a novel technique for a robust flash file system. This method is based on the log block FTL algorithm and guarantees that all the sectors bounded together are written completely or no sectors are written at all for any interruptions, and thus distributed metadata of flash file system can be safely updated, and the integrity of the file system can he safely maintained. Our simulation results show that the FAT file system using our method is maintained safe for sudden power failure events. View full abstract»

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  • 3G mobile network call admission control scheme using Markov chain

    Page(s): 276 - 280
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (249 KB) |  | HTML iconHTML  

    A new call admission control (CAC) scheme is proposed. It is built upon a reserve channels CAC scheme, in which some reserve channels are allocated using the cost factor. This scheme also enjoys the strongpoint provided by the DTBR scheme, in which multiple thresholds are used to meet the specific quality-of-service (QoS) requirements. A wireless network cell serving two types of customers; narrowband customers (e.g. voice services), which require 1 channel and wideband customers (e.g. data services), which require bw ≥ 1 channel is considered. The proposed scheme is compared with the DTBR scheme to demonstrate that the R-DTBR is capable of providing the QoS guaranteed for each type of traffic, while at the same time leading to much better channel efficiency. View full abstract»

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  • Algorithm and architecture for multirate polyphase video scaling with panoramic effect and enhanced video quality

    Page(s): 87 - 92
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (314 KB) |  | HTML iconHTML  

    Traditional digital video scaling methods usually employ only linear approximation for output pixels, without any post processing. A new scaling method is presented in this paper. We propose an 8-fap 64 phases polyphase filter bank that combines a 3-tap peaking filter and a 6-tap 64 phases scaling polyphase filter. A third order cubic polynomial approximation method is introduced to generate linear and nonlinear scaling operations with the new polyphase filter structure. Panoramic effects are achieved by applying proper initial parameters for the first, second, and third order derivatives to control the behaviour of polynomial. Moreover, a simple implementation of horizontal and vertical peaking and scaling architecture is presented. Finally, examples showing different video enhanced results are provided. View full abstract»

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  • Design and implementation of the new extended architecture for notebook-TVs

    Page(s): 74 - 79
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    Currently, users can watch TV on a notebook managed by an operating system (OS) and by an USB's TV box. In this paper, we propose a new extended design for notebooks, which eliminates the need to boot the OS. By using our design, one can quickly turn on the TV function of a notebook. In this specific TV mode, the notebook need not use CPU, memory, HDD and other devices. It only uses the LCD panel. However, under the OS mode, the notebook can function both as a TV and as a computer, which may not be used while watching TV. Our design includes an extra controller and peripheral devices for providing the interface functions of the TV signals. This controller includes video format transformation, timing generator, panel transmitter, de-interlace and system control functions for the LCD panel. Hence, with this extra controller, our design has two advantages: the first one is the reduction of the waiting time required for first booting the OS in order to watch TV; the other one is reduction of power consumption as, when only watching TV, the CPU, memory, hard disk and other unused modules in a notebook are turned off. View full abstract»

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  • Improved channel estimation in TDMA by reproduction with applications in GSM/GPRS under co-channel interference

    Page(s): 215 - 219
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (273 KB) |  | HTML iconHTML  

    Finding an estimate of the channel impulse response (CIR) by correlating a received known (training) sequence with the sent training sequence is commonplace. Where required, it is also common to truncate the longer correlation to a sub-set of correlation coefficients by finding the set of N sequential correlation coefficients with the maximum power. This paper presents a new approach to selecting the optimal set of N CIR coefficients from the correlation rather than relying on power. The algorithm reconstructs a set of predicted symbols using the training sequence and various sub-sets of the correlation to find the sub-set that results in the minimum mean squared error between the actual received symbols and the reconstructed symbols. The application of the algorithm is presented in the context of the TDMA based GSM/GPRS system to demonstrate an improvement in the system performance with the new algorithm and the results are presented in the paper. However, the application lends itself to any training sequence based communication system often found within wireless consumer electronic device. View full abstract»

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  • Adaptive fuzzy search algorithm for improving the efficiency of block motion estimation

    Page(s): 450 - 455
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (398 KB) |  | HTML iconHTML  

    This paper proposes an adaptive fuzzy search (AFS) algorithm, based on the spatial and temporal correlation of image sequences, for improving the efficiency of block motion estimation. Due to the fuzzy reasoning method, the proposed algorithm could precisely predict the motion vector and reduce the computational cost. The essential difference between AFS and other related fuzzy methods is the adaptive ability for membership functions that are established according to the relationship of blocks and their neighbors. A Gaussian function is constructed through the differences between current block and its adjacent blocks. According to the Gaussian function of the current block, the weight of each adjacent block could be determined and then predict an initial center for the current block. This is why the AFS is adaptive and robust than other algorithms. Taking both the search point and block distortion measure into consideration, the performance of AFS is indeed better than the general inter-block/inter-frame fuzzy search (IIFS), TSS and LS. View full abstract»

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  • Wideband FM detection using an adaptive second order TDTL

    Page(s): 432 - 437
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (246 KB) |  | HTML iconHTML  

    In this work a time delay tanlock loop (TDTL) with an adaptive loop mechanism for faster acquisition and more reliable locking is proposed. The adaptive loop is designed to preserve the high SNR properties of the second order TDTL and overcomes its frequency locking limitation. This achieved by adjusting the loop digital filter coefficients and the digital controlled oscillator frequency when the system is subjected to large frequency disturbances that cause the loop to go out of lock. The sensing of the frequency disturbances and the adaptation process is automatically controlled by a finite state machine (FSM). View full abstract»

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  • A co-processor architecture for video scan-rate-conversion and spatial/temporal noise reduction

    Page(s): 34 - 38
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (278 KB) |  | HTML iconHTML  

    A co-processor architecture for video scan-rate-conversion and noise reduction is presented. Both motion compensated and non-motion compensated deinterlacing and up-conversion algorithms are supported. This enables the co-processor to process both standard definition TV and high definition TV signals at low cost, offering a viable solution for consumer applications. View full abstract»

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  • A constant-time quantization strategy for a real-time MP-3 encoder

    Page(s): 59 - 63
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (259 KB) |  | HTML iconHTML  

    This paper reports an efficient quantization strategy for the implementation of a real-time MP-3 encoder based on a digital signal processor. Since the well-known two-loop quantization method requires a large and unpredictable amount of computation, it is not suitable for real-time encoders. Therefore, we develop an algorithm to reduce the computational burden of this part using a single three-iteration loop. Experiments show that the quality of our quantization method is close to the best possible quantization with fixed scalefactors in the distortion loop. Based on a 16-bit fixed-point digital signal processor, the proposed encoding scheme requires 35 MIPS of computation for encoding 128 kbps stereo music. View full abstract»

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  • Design and implementation of an ASIC architecture for the context-based binary arithmetic encoder

    Page(s): 83 - 86
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (229 KB) |  | HTML iconHTML  

    This paper presents an area-efficient ASIC architecture for the context-based binary arithmetic encoder in JPEG2000, which is compatible with the arithmetic encoder defined in ISO/IEC 155444-1. The proposed architecture employs look-ahead computation as well as data-dependency analysis to improve the encoding performance. By exploiting these two strategies, the averaged encoding cycle time for each input symbol can be significantly reduced. According to our simulation results, for each byte of compressed data the proposed architecture spends only two clock cycles in most cases and at most five clock cycles in rare cases. Moreover, we have implemented the proposed architecture using an FPGA and successfully validated its function. View full abstract»

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  • Lightweight PnP ECG sensor for monitoring of biomedical signals

    Page(s): 140 - 144
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (290 KB) |  | HTML iconHTML  

    This paper describes the design and implementation of a single-channel, low cost ECG sensor for home use. ECG monitoring is traditionally done in hospitals as the equipment involved is bulky, difficult to use and expensive for home usage. The presented sensor enables ECG home monitoring as it fulfills a number of criteria related to home usage: safe to use in home environment, lightweight, cheap and easy to use. The ECG sensor operates over a frequency range of 0.05 - 40 Hz or 0.05 - 100 Hz and includes 50 Hz - 60 Hz Notch filters to remove mains induced interference. The component specifications were chosen such that the circuit currents and voltages satisfy the standards of the Association for the Advancement of Medical Instrumentation (AAMI). Tests were performed, and the acquired raw ECG data was verified to be acceptable. View full abstract»

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