Có 19+ tài liệu thuộc chủ đề "Lập trình DSP"
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We draw on the experience of experts from MIT, Berkeley, UCLA, Worcester Polytechnic Institute, INRIA, Authentec, Radioscape, Geovector and Texas Instruments, to give a description of some of the important building blocks and implementation choices that combine both technologies, in the past and in the future. We highlight different perspectives, especially regarding implementation issues, in the processing of speech, audio,...
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Rather, it was a result of a battle between competing designs in the market place. Indeed, the full extent of the use of programmable DSPs today was probably not appreciated, even by those who were proposing DSP use, when the 2G market began to take off.. In this chapter we present the argument from a pro-DSP perspective by looking at...
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Due to the various service scenarios – low- end voice to high-end high data rate – flexibility of the design is imperative.. By looking at the origin of the dual-mode system, we find two main drivers.. On the other hand, in the 1980s it was quite easy for the small number of European members to agree on a single radio...
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At the same time, this approach is one of the most cost effective known. These new 3G standards come under the coordination of the International Telecommunication Union (ITU) under the name of IMT-2000. Wideband CDMA techniques form the core of the higher capacity portions of these new standards and are the primary focus of this chapter.. This chapter presents our...
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This includes the application of the receiver weights, and the adaptation of those weights. An example of the fixed beam approach is shown in Figure 5.1. The center of the coordinate system is chosen arbitrarily to be the geo-center of the receiver array. The location of the emitter is at r 0 . Figure 5.1 Choosing a fixed antenna pattern...
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To some extent, there is a perception that adopting the new standards will result, almost instantaneously, in being able to design a plethora of multi-purpose wireless Internet appliances with features and capabilities far beyond those found in today’s wireless telephones and palmtop organizers.. Recent discussion in the industry has suggested that the coming months will bring a kind of super-communications/entertainment...
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From the mid-1980s to the mid-1990s, we were in the ‘‘Personal Computer’’ era and CISC microprocessors fuelled the semiconductor market growth (Figure 7.1). We are now in a new era where people demand high personalized bandwidth, multimedia entertainment and infor- mation, anywhere, anytime: Digital Signal Processing (DSP) is the driver of the new era (Figure 7.2). In this chapter, we...
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First, Java is portable, and that means that it is independent of the hardware platform it runs on, which is very important for reducing the cost of application development. It is clear that the success of Java is conditioned by the availability of a Java execution environment that will manage efficiently these resources.. As energy consumption is very important for...
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Speech Coding Standards in Mobile Communications. Speech coding is at the heart of digital wireless telephony. Standards bodies specify all aspects of the entire communication system, including the air interface, modulation techniques, communication protocols, multi- ple access technologies, signaling, and speech coding and associated channel error control mechanisms. Advances in speech coding have resulted in considerable improvements in the voice...
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10.1 Introduction. 10.2 DSP Based Speech Recognition Technology. 10.2.1 Problem: Handling Dynamic Vocabulary. 10.2.2 Solution: DSP-GPP Split. The recognition models are prepared on the GPP and transferred to the DSP. 10.3 Overview of Texas Instruments DSP Based Speech Recognizers. 10.3.1 Speech Recognition Algorithms Supported. 10.3.2 Speech Databases Used. 10.3.2.1 TIDIGITS. 10.3.2.2 TI-WAVES. For each condition, the windows of the car...
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11.1 Introduction. State-of-the-art compression technology makes it feasible to have mobile access to multimedia content, probably at reduced resolution.. As the technological hurdles of multimedia communication are being solved, the accep- tance of the technology also depends on the availability of content, and the availability of high-bandwidth service from network providers, which also depends on consumer demand and the cost...
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Telecom- munication fraud has been documented already in the early days of the telegraph, though every attempt was then made to guard the secrecy of transmissions. There was clearly money to be made at the time by speculators if, for instance, they could find a way to transmit news from the stock market in, say, Paris, to other parts of...
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Identity recognition deals with the left half of the relationship illustrated in Figure 13.1. 13.2 The Speaker Verification Task. There are two major challenges in the use of voice verification, both dealing with the random nature of the audio signal. The first challenge is the variation of the speech signal. The acoustics of speech for each word also vary naturally,...
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The second is In-Band On-Channel (IBOC) which broadcasts the digital signal in the sidebands of the existing analog AM/FM signal and will provide local coverage once completed. Interleaving of the data across multiple frequencies, to de-cohere frequency specific corruptions.. Interleaving of the data across time, to de-cohere temporally-specific corruptions (e.g.. Similarly, extend- ing the symbol period of the digital data...
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15.1 Introduction. This chapter will investigate five signal processing specific platforms: three programmable DSP processors – the TI C55x, the TI C54x, and the TI C6x. All five designs will be compared based on energy, area, clock frequency/MIPS and design time.In the first section, a brief introduction to the LPC speech coder algorithm will be given. In the second section,...
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16.1 Introduction. Figure 16.1 shows an example wireless sensor network.. Figure 16.1. 16.2 Power-Aware Node Architecture. Depending on the role of the sensor within the network, the data is processed in the data and control processing subsystem. The central component of the data and control processing subsystem is the StrongARM SA-1100 microprocessor. Figure 16.3 shows a printed circuit board which...
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The Pleiades architecture relies on a heterogeneous network of processing elements, optimized for a given domain of algorithms, that can be reconfigured at run time to execute the dominant kernels of the given domain. To verify the effectiveness of the Pleiades architecture, prototype processors have been designed, fabri- cated, and evaluated. Measured results and benchmark studies will be used to...
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18.1 The Need for Instruction Set Extensibility in a Signal Processor. On previous implementations, dedicated hard- ware, sitting outside of the processor, took care of the whole trellis execution. The behavior of the network carrying these streams is also becoming more and more flexible with the combination of. Table 18.1 summarizes complexity and flexibility requirements on some typical applications.. These...
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The Pointing Wireless Device for Delivery of Location Based Applications. 19.1 Next Generation Wireless Devices. 19.2 The Platform. 19.3 New Multimedia Applications. are all literally in the hand of the user.. 19.4 Location Based Information. 19.5 Using Devices to Summon Information. Information exists in various databases and on various sites and the device has the ability to present users with...