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1997 International Conference on Consumer Electronics最新文献

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Real-time Implementation Of Qcelp On A Fixed Point Dsp Chip 定点Dsp芯片上Qcelp的实时实现
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.626005
Kim, Yoon, Lee, Choi, Yoo
This paper presents a real-time implementation of the QCELP speech coder which has been chosen as digital cellular standard in North America and Korea. A real-time implementation of QCELP algorithm can be realized using 16-bit fixed point digital signal processor. The principle of QCELP algorithm and real-time implementation on fixed point DSP chip are addressed. The paper also discusses the finite word-length effects and considers the methods to reduce the effects through fixed point C simulation. In addition to speech service in CDMA Mobile System, the implementation of data service(be1ow 4.8kbps) by speech coder bypass operation is presented.
本文提出了一种QCELP语音编码器的实时实现方法,该编码器已被北美和韩国选为数字蜂窝标准。采用16位定点数字信号处理器可以实现QCELP算法的实时实现。介绍了QCELP算法的原理及其在定点DSP芯片上的实时实现。本文还讨论了有限字长效应,并考虑了通过不动点C模拟来减小影响的方法。除了CDMA移动系统中的语音业务外,还介绍了通过语音编码器旁路操作实现4.8kbps以下的数据业务。
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引用次数: 0
Design Of Efficient Optical Fiber Systems For CATV/HDTV Distributions 用于CATV/HDTV分发的高效光纤系统设计
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.625890
Jian‐guo Zhang, Ritthisoonthorn, Sharma, Erke
We present the design of intensity-modulation directdetection optical fiber communication systems with erbium-doped fiber amplifiers for CATV/HDTV distributions. Three system configurations: the In-Line Amplifier scheme; the Passive Star Coupler with Optically Preamplified Receivers scheme; and the Hybrid Passive-and-Active Star Coupler scheme; are considered. The receiver sensitivity is calculated for various system parameters. We also compare these three schemes through the number of HDTV subscribers.
本文提出了一种基于掺铒光纤放大器的强度调制直接探测光纤通信系统的设计,用于有线电视/高清电视分布。三种系统配置:在线放大器方案;无源星耦合器与光预放大接收机方案;无源-有源混合星形耦合器方案;被认为是。计算了不同系统参数下的接收机灵敏度。我们还通过高清电视用户数量对这三种方案进行了比较。
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引用次数: 0
Scalable Compression Based On Fractal Image Coding 基于分形图像编码的可伸缩压缩
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.625879
Kuo, Huang, Lee
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引用次数: 0
Window Based Graphics For The Digital Set Top Box 基于窗口的数字机顶盒图形
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.625846
Benbassat, Giani, Chauvel
This paper describes a Window Based Graphic system that was conceived to facilitate the design of efficient Graphic User Interface for the Digital Set Top Box. It analyzes its impact on display memory cost, graphic resolution and response time.
本文介绍了一种基于窗口的图形系统,该系统旨在为数字机顶盒设计高效的图形用户界面。分析了其对显示内存成本、图形分辨率和响应时间的影响。
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引用次数: 0
An Area Efficient Hardware Sharing Filter Generator For Integration Of Multiple Video Format Conversions 一种用于多种视频格式转换集成的面积高效硬件共享滤波器发生器
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.626023
Sugawa, Shimamoto, Hosotani, Imamura, Takagaki, Ijiri, Okada, Sumi
A software program, which automatically generates the minimum circuits of FIR Filters using new hardware sharing techniques, has been developed. Its performance has been demonstrated by an application to a video format conversion LSI.
利用新的硬件共享技术,开发了FIR滤波器最小电路自动生成的软件程序。其性能已通过视频格式转换LSI的应用得到验证。
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引用次数: 3
A Ferroelectric Memory Embedded In A RFID Transponder With 2.4V Operation And 10 Year Retention At 70/spl deg/C 在70/spl度/C下2.4V工作和10年保留的嵌入在RFID应答器中的铁电存储器
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.625969
Inoue, Shimada, Nakane, Moriwaki, Chaya, Nakakuma, Matsuura, Sumi, Otsuki
A FeRAM with l0year data retention at 70°C was embedded in a RFID tag. The use of SrBi2 Ta2 0 9 allowed a 2.4V operation with a long access distance of 50cm from a ReaderlWriter. Introduction A 288bit SBTO (SrBi2Ta209) based FeRAM (ferroelectric random access memory) embedded IC for contactless RFID (radio frequency identification) tags (transponders) has been developed. The emphasis is placed on its advantages in retention at high temperatures and low-voltage operation allowing contactless data communication at far distances. FeRAM Performance A material solution to fatigue in ferroelectric memories has been achieved by the use of SBTO with Pt electrodes:[l]. In addition, the FeRAM using SBTO exhibits low switching voltages and high-switching speeds: [2-31. Therefore SBTO memories are the best choice for nonvolatile memories for use in low power and high speed applications. The FeRAM is composed of two transistors and two SBTO capacitors per bit. The SBTO capacitors were fabricated using a MOD (metallo-organic decomposition) technique: [2]. Figure 1 shows the operating voltage range of the embedded FeRAM. The lower limit of the range at an access time of 1 . 2 , ~ s is 2.4V, low enough for write or read. Figure 2 shows the temperature dependence of MTBF (mean time between failure) for data retention of the FeRAM, programmed at 2.4V. The activation energy of MTBF in data retention is 1 .1 5eV. The data retention of FeRAM is estimated to be longer than 10 years at 70°C. The time dependence of remnant polarization of SBTO capacitors for different write voltages is shown in Figure 3. The remnant polarization written at 2.4V is found to be preserved with a sufficient margin for longer than 10 years at 70°C. RFID Tag System Figure 4 shows a block diagram of the RFID tag circuit incorporating a FeRAM. The power generator supplies DC voltage by rectifying the current induced by the electromagnetic field at a frequency of 125 kHz, provided by a Readerwriter. The receiver demodulates the signals from the Readerwriter by phase shift keying. Then the transmitter sends RF signals back to the Readerwriter, also by phase shift keying. The control logic circuit coordinates the cooperative operation of the FeRAM, transmitter and receiver. Figure 5 shows a photo of the IC. Performances and Characteristics of RFID Tag Figure 6 shows the generated DC voltage at the power generator versus access distance between a RFID tag and a Readerwriter. Since the FeRAM operates even at 2.4V, the RFID tag can communicate with the Readerwriter at a distance of up to 50cm. The followings are typical performances and characteristics of the RFID tag: Memory technology Memory size Data retention Endurance Transmit carrier frequency : Receive carrier frequency : Transmit modulation Receive modulation Chip size SBTO FeRAM 288bit 1 Oyears at 7 0°C 1 x 10"cycles 62.SkHz 125kHz BPSK@7812.Sbps BPSK@78 12.5bps 2.76x2.3 8mm2
在70°C下具有10年数据保留的FeRAM嵌入RFID标签中。使用SrBi2 ta20 9允许2.4V操作,与ReaderlWriter的访问距离为50cm。已经开发了一种基于288位SBTO (SrBi2Ta209)的FeRAM(铁电随机存取存储器)嵌入式IC,用于非接触式RFID(射频识别)标签(转发器)。重点放在其在高温和低压操作下保持的优势上,允许远距离非接触式数据通信。通过使用带有Pt电极的SBTO,已经实现了铁电存储器中疲劳的材料解决方案:[1]。此外,使用SBTO的FeRAM具有低开关电压和高开关速度:[2-31]。因此,SBTO存储器是用于低功耗和高速应用的非易失性存储器的最佳选择。FeRAM由两个晶体管和两个SBTO电容器组成。SBTO电容器采用MOD(金属有机分解)技术制备:[2]。图1显示了嵌入式FeRAM的工作电压范围。访问时间为1的范围下限。2、~ s为2.4V,足够低,可写入或读取。图2显示了FeRAM数据保留的MTBF(平均故障间隔时间)的温度依赖性,编程为2.4V。MTBF在数据保留中的活化能为1.5 ev。据估计,FeRAM在70°C下的数据保留时间超过10年。不同写电压下SBTO电容剩余极化的时间依赖性如图3所示。在70°C下,2.4V下的残余极化可以保存10年以上。RFID标签系统图4显示了包含FeRAM的RFID标签电路的框图。发电机通过整流由电磁场感应的电流提供直流电压,频率为125千赫,由读写器提供。接收机通过相移键控解调来自读写器的信号。然后发射器将射频信号发送回阅读器,也是通过相移键控。控制逻辑电路协调FeRAM、发送器和接收器的协同工作。图5显示了IC的照片。RFID标签的性能和特性图6显示了发电机产生的直流电压与RFID标签和读写器之间的访问距离。由于FeRAM即使在2.4V电压下也能工作,因此RFID标签可以与读写器在50厘米的距离内进行通信。以下是RFID标签的典型性能和特点:内存技术内存大小数据保持寿命发射载波频率:接收载波频率:发射调制接收调制芯片尺寸SBTO FeRAM 288bit在70°C下1年1 x 10“周期62。SkHz 125kHz BPSK@7812.Sbps BPSK@78 12.5bps 2.76x2.3 8mm2
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引用次数: 0
A High Quality Real Time VBR MPEG-2 System For Broadcasting Appucations 广播应用的高质量实时VBR MPEG-2系统
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.625922
Zahir, Leung
A high quality variable bit rate (VBR) MPEG- 2 encoding scheme that offers optimum video quality and bandwidth allocation is presented. The proposed scheme is very easy to implement and offers a very efficient real time VBR solution for broadcasting applications that involve multiplexed distribution of multiple video sources. A High Quality Pseudo VBR MPEG Encoding Process The advantage of variable bit rate (VBR) video over constant bit rate (CBR) is that it preserves picture quality regardless of the video content and offers optimum bandwidth allocation so that a potentially greater number of multiplexed VBR streams may be transmitted over a given bandwidth. Several different implementations of statistical multiplexing of multiple video sources and optimization of bandwidth allocation using VBR streams have been reported in the literature. However, the generation of VBR streams has not received the attention it deserves. In many cases, VBR streams are either obtained by using fixed quantization levels and multiplexing controllers or by assuming multi-layer implementations of the MPEG compression standard. These "non-true" VBR streams do not depend entirely on picture quality and thus do not closely represent the VBR distribution that is found in actual broadcasting applications. In video production and real-time broadcasting applications, rapid scene changes and excessive motion increase the differences between consecutive frames and as a result have a very negative impact in the perceived quality of the video. To overcome this problem, adjustment of the "standard frame sequence is necessary in order to accommodate for the extra information needed to accurately represent drastic changes between adjacent frames. We developed a method which automatically adjusts the frame sequence and the number of bits needed to represent each frame depending on the video content. The result is a significant improvement in video quality. Our method uses a large 30 frame GOP which allows for efficient redistribution of bits while introducing maximum delay of three frames. Redistribution of bits is based on a "smart" combination of SNR, quantization and motion activity information for each frame. Large 30 frame GOP's tend to have a significant number of low motion frames which are "starved" by ow algorithm thus saving bits for more active frame sequences. In addition, I frames are forced by our method on scene cuts thus introducing more than one I frame within a GOP and preventing long propagation of impairments due to rapid changes. Although the bit rate can be kept constant for every GOP, the increase of the GOP size in combination with our smart redistribution of bits generates a pseudo VBR stream effect which results in considerable improvements in video quality. Performance evaluations have shown that for the same picture quality our method improves the compression rate by at least 25%. The video streams generated by our encoder were successfully played back b
提出了一种高质量可变比特率(VBR) MPEG- 2编码方案,可提供最佳的视频质量和带宽分配。该方案易于实现,为涉及多个视频源复用分发的广播应用提供了一种非常有效的实时VBR解决方案。可变比特率(VBR)视频比恒定比特率(CBR)视频的优点是,无论视频内容如何,它都能保持图像质量,并提供最佳带宽分配,以便在给定带宽上传输潜在的更多多路VBR流。文献中已经报道了几种不同的多视频源统计复用实现和使用VBR流的带宽分配优化。然而,VBR流的生成并没有得到应有的重视。在许多情况下,VBR流要么通过使用固定的量化水平和多路复用控制器获得,要么通过假设多层实现MPEG压缩标准获得。这些“非真实”的VBR流并不完全依赖于图像质量,因此不能很好地代表实际广播应用中发现的VBR分布。在视频制作和实时广播应用中,快速的场景变化和过度的运动增加了连续帧之间的差异,从而对视频的感知质量产生了非常负面的影响。为了克服这个问题,调整“标准帧序列”是必要的,以便适应精确表示相邻帧之间剧烈变化所需的额外信息。我们开发了一种方法,可以根据视频内容自动调整帧序列和表示每帧所需的比特数。其结果是视频质量的显著提高。我们的方法使用一个大的30帧GOP,它允许有效的重新分配比特,同时引入三帧的最大延迟。比特的重新分配是基于每帧信噪比、量化和运动活动信息的“智能”组合。大的30帧GOP往往有大量的低运动帧,这些帧被ow算法“饿死”,从而为更活跃的帧序列节省了比特。此外,我们的方法在场景剪切中强制使用I帧,从而在GOP中引入多个I帧,并防止由于快速变化而导致的损伤长时间传播。虽然比特率可以对每个GOP保持恒定,但GOP大小的增加与我们的智能比特再分配相结合,会产生伪VBR流效果,从而大大提高视频质量。性能评估表明,对于相同的图像质量,我们的方法将压缩率提高了至少25%。我们的编码器生成的视频流在现有的所有硬件和软件MPEG-1和MPEG-2播放器上都能成功地播放。一个真正的VBR MPEG.2系统
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引用次数: 4
A 13.56MHz Smartcard CMOS IC With Ferroelectric Memory Utilizing Carrier Synchronous Data Sampling 基于载波同步数据采样的13.56MHz铁电存储器智能卡CMOS集成电路
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.625983
Hollenbeck, Connell, Paitl
A 13.56Mhz, lOcm read range smartcard powered over the RF was implemented in CMOS using switched capacitor circuitry to sample the data carrier. A 4-bit microprocessor and FeRam are also integrated on the IC. I. INTRODUCTION
一个13.56Mhz, lOcm读取范围智能卡供电的射频在CMOS中实现使用开关电容电路采样数据载波。集成电路还集成了一个4位微处理器和FeRam
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引用次数: 0
Development Of A Transmission System And Receiver For Satellite ISDB 卫星ISDB传输系统与接收机的研制
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.625861
Hashimoto, Katoh
ISDB (Integrated Services Digital Broadcasting) is a concept of the next generation dgi ta l broadcasting system. The ISDB transmission system for the 12GHz band Direct Broadcasting Satellite should take into account not only high spectrum efficiency, but also high reliability against degradation of received signal under heavy rainfall. The main modulation scheme o f the 12GHz band satellite ISDB transmission system is TC8PSK which has a high spectrum efficiency. Other modulation schemes can be selected. The parameters o f the transmission scheme can be varied by introducing TMCC (Transmission and Multiplexing Configuration Control). A hierarchical transmission which complements transmission during heavy rainfall without high reduction of transmission rate is also available. This paper introduces the satellite ISDB system, focusing on its transmission system and a receiver structure tha t uses newly developed LSIs.
ISDB(综合业务数字广播)是下一代数字广播系统的概念。12GHz波段直播卫星ISDB传输系统不仅要考虑高频谱效率,还要考虑强降雨条件下接收信号的高可靠性。12GHz波段卫星ISDB传输系统的主要调制方案是TC8PSK,该方案具有较高的频谱效率。可以选择其他调制方案。通过引入TMCC(传输与复用配置控制),可以改变传输方案的参数。此外,还可以采用分层传输的方式,在强降雨期间补充传输,但传输速率不会大幅降低。本文介绍了卫星ISDB系统,重点介绍了卫星ISDB系统的发射系统和采用新研制的lsi的接收结构。
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引用次数: 0
A Coprocessor For TV-sound In A Multimedia-PC 多媒体pc中电视声音的协处理器
Pub Date : 1997-06-11 DOI: 10.1109/ICCE.1997.625912
Reventlow, Kohler, Gerspacher, Kindler, Schwendt
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引用次数: 0
期刊
1997 International Conference on Consumer Electronics
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