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Signal Processing Magazine, IEEE

Issue 4 • Date July 2011

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Displaying Results 1 - 25 of 27
  • [Front cover]

    Publication Year: 2011 , Page(s): C1
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  • [Table of Contents]

    Publication Year: 2011 , Page(s): 1
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  • Signal Processing Trends in Media, Mobility, and Search [From the Editors]

    Publication Year: 2011 , Page(s): 2 - 6
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  • Editorial Board

    Publication Year: 2011 , Page(s): 2
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  • Administrative and Policy Issue Highlights [President's Message]

    Publication Year: 2011 , Page(s): 4
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  • SPS Members Receive IEEE Awards [Society News]

    Publication Year: 2011 , Page(s): 6
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  • On “A Flexible Window Function for Spectral Analysis” [Letter to Editor]

    Publication Year: 2011 , Page(s): 7 - 13
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  • Mobile Computing Has a Growing Impact on DSP Apps and Markets [Special Reports]

    Publication Year: 2011 , Page(s): 8 - 11
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (150 KB) |  | HTML iconHTML  

    Databeans, one of the market research organizations that follows the semiconductor industry, recently published its updated worldwide semiconductor revenue forecast for 2011. The number of mobile broadband subscribers is expected to almost double this year to 1 billion and climb to 5 billion in 2016. Consumers and business users continue to demonstrate a healthy demand for mobile data services. View full abstract»

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  • Media Search in Mobile Devices [From the Guest Editors]

    Publication Year: 2011 , Page(s): 12 - 13
    Cited by:  Papers (1)
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  • An Auditory Display in Playlist Generation

    Publication Year: 2011 , Page(s): 14 - 23
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1549 KB) |  | HTML iconHTML  

    A current area of research within music information retrieval is the automatic formation of music playlists: automatically creating a meaningful arrangement of music tracks. It is an application area particularly suited for accessing music on mobile devices as music collections are becoming too large to manually navigate. The growth of music streaming services means that even more vast collections of music are accessible from a mobile device. Much energy has been spent constructing the best algorithms to create a playlist, but less has been spent on how that algorithm is presented and accessed, particularly on a mobile device. View full abstract»

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  • Huge Music Archives on Mobile Devices

    Publication Year: 2011 , Page(s): 24 - 39
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2054 KB) |  | HTML iconHTML  

    The availability of huge nonvolatile storage capacities such as flash memory allows large music archives to be maintained even in mobile devices. With the increase in size, manual organization of these archives and manual search for specific music becomes very inconvenient. Automated dynamic organization enables an attractive new class of applications for managing ever-increasing music databases. For these types of applications, extraction of music features as well as subsequent feature processing and music classification have to be performed. However, these are computationally intensive tasks and difficult to tackle on mobile platforms. Against this background, we provided an overview of algorithms for music classification as well as their computation times and other hardware-related aspects, such as power consumption on various hardware architectures. For mobile platforms such as smartphones, a careful balance of algorithm complexity, hardware architecture, and classification accuracy has to be found to provide a high quality user experience. View full abstract»

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  • Speech and Multimodal Interaction in Mobile Search

    Publication Year: 2011 , Page(s): 40 - 49
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1401 KB) |  | HTML iconHTML  

    With the widespread adoption of high-speed wireless networks symbiotically complemented by the burgeoning demand for smart mobile devices, access to the Internet is evolving from personal computers (PCs) to mobile devices. In this article, we highlight the characteristics of mobile search, discuss the state of speech-based mobile search, and present opportunities for exploiting multimodal interaction to optimize the efficiency of mobile search. View full abstract»

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  • In-Car Media Search

    Publication Year: 2011 , Page(s): 50 - 60
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1346 KB) |  | HTML iconHTML  

    Over the last decade, our ability to access, store, and consume huge amount of media and infor mation on mobile devices has skyrocketed. While this has allowed people who are on the go to be more entertained, informed, and con nected, the small-form factor of mobile devices makes manag ing all of this content a difficult task. This difficulty is significantly amplified when we consider how many people are using these devices while driving in automobiles and the high risk of driver distraction such devices present. A recent govern ment study concluded that drivers performing complex secondary tasks such as operating or viewing a mobile device or personal digital assistant (PDA) were between 1.7 and 5.5 times more likely to be involved in a crash or near crash. View full abstract»

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  • Mobile Visual Search

    Publication Year: 2011 , Page(s): 61 - 76
    Cited by:  Papers (62)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2936 KB) |  | HTML iconHTML  

    Mobile phones have evolved into powerful image and video processing devices equipped with high-resolution cameras, color displays, and hardware-accelerated graphics. They are also increasingly equipped with a global positioning system and connected to broadband wireless networks. All this enables a new class of applications that use the camera phone to initiate search queries about objects in visual proximity to the user (Figure 1). Such applications can be used, e.g., for identifying products, comparison shopping, finding information about movies, compact disks (CDs), real estate, print media, or artworks. View full abstract»

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  • Mobile Visual Location Recognition

    Publication Year: 2011 , Page(s): 77 - 89
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3549 KB) |  | HTML iconHTML  

    With recent advances in CBIR, mobile visual location recognition becomes feasible. Using video recordings of a mobile device as a visual fingerprint of the environment and matching them to a georeferenced database provides pose information in a very natural way. Hence, LBSs can be provided without complex infrastructure in areas where the accuracy and availability of GPS is limited. This includes indoor environments where georeferenced data are just about to become publicly available. View full abstract»

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  • Quantification and Transmission of Information and Intelligence—History and Outlook [DSP History]

    Publication Year: 2011 , Page(s): 90 - 101
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1146 KB) |  | HTML iconHTML  

    One of the most important achievements of humankind is the ability to communicate remotely, now almost without bounds, in time, in distance, and in modes. The history of the technical development that led to the current achievement is intriguing and inspiring, although confusing at times because the term communication may encompass notions of varying sophistication, from simple delivery of data and reconstruction of information, to measurement of articulation, retention of intelligibility, comprehension, and ultimately inference of intelligence. This article intends to lay these notions on a historical path with technical interpretations that may help to both clarify the existing theories and provoke new thinking to prepare us for the next challenge, whatever that may be. View full abstract»

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  • Wideband Spectrum Sensing at Sub-Nyquist Rates [Applications Corner]

    Publication Year: 2011 , Page(s): 102 - 135
    Cited by:  Papers (29)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1303 KB) |  | HTML iconHTML  

    In this article, we present a mixed analog-digital spectrum sensing method that is especially suited to the typical wideband setting of CRs. The next section briefly summarizes existing approaches to CR sensing. The advantages of our system with respect to current architectures are threefold. First, our analog front end is fixed and does not involve scanning hardware. Second, both the analog-to-digital conversion (ADC) and the digital signal processing (DSP) rates are substantially below Nyquist. Finally, the sensing resources are shared with the reception path of the CR, so that the low-rate streaming samples can be used for communication purposes of the device, besides the sensing functionality they provide. Combining these advantages leads to a real-time map of the spectrum with minimal use of mobile resources. Our approach is based on the modulated wideband converter (MWC) system, which samples sparse wideband inputs at sub-Nyquist rates. We report on results of hardware experiments, conducted on an MWC prototype circuit, which affirm fast and accurate spectrum sensing in parallel to CR communication. This can help alleviate one of the current main bottlenecks in wide-spreading deployment of CRs. View full abstract»

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  • Research Challenges and Opportunities in Mobile Applications [DSP Education]

    Publication Year: 2011 , Page(s): 108 - 110
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (282 KB) |  | HTML iconHTML  

    Following the rapid proliferation of mobile devices, especially smartphones, both server-based and embedded speech and multimodal applications started to emerge. These range from simpler applications where speech recognition is followed by a known task such as voice search or messaging, to more complex systems such as speech-to-speech translation, educational applications, or personal assistants. View full abstract»

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  • What Is a Savitzky-Golay Filter? [Lecture Notes]

    Publication Year: 2011 , Page(s): 111 - 117
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (331 KB) |  | HTML iconHTML  

    This article has attempted to answer the question "What is a Savitky-Golay filter?" in terms that will be familiar to the DSP community and readers of IEEE Signal Processing Magazine. This article reviewed the definition and properties of S-G filters and showed how they can be designed easily using polynomial approximation of an impulse sequence. In contrast to most discussions of S-G filters, they focused on the frequency domain properties, and offered an approximate formula for the 3-dB cutoff frequency as a function of polynomial order N and impulse response half length M. Engineers with a frequency domain mindset may find this useful if they choose to use S-G filters in their application. View full abstract»

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  • Low-Pass Filtering of Irregularly Sampled Signals Using a Set Theoretic Framework [Lecture Notes]

    Publication Year: 2011 , Page(s): 117 - 121
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1869 KB) |  | HTML iconHTML  

    In this article, the goal is to show that it is possible to filter nonuniformly sampled signals according to specs defined in the Fourier domain. In many practical applications, it is necessary to filter irregularly sampled data including seismic signal processing, synthetic aperture radar (SAR) imaging systems, three-dimensional (3-D) meshes, and digital terrain models [1], [2]. View full abstract»

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  • Multiplier-Free Divide, Square Root, and Log Algorithms [DSP Tips and Tricks]

    Publication Year: 2011 , Page(s): 122 - 126
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (347 KB) |  | HTML iconHTML  

    Many signal processing algorithms require the computation of the ratio of two numbers, the square root of a number, or a logarithm. These operations are difficult when using fixed point hardware that lack dedicated multipliers, such as low-cost microcontrollers, application specific integrated circuits (ASICs), and field programmable gate arrays (FPGAs). This article presents straightforward, multiplier free algorithms that implement both division and square roots, based on a technique known as dichotomous coordinate descent (DCD) (See [1] as a starting point, where several articles by the same authors are referenced.) We also make available a multiplier-free logarithm algorithm. All these algo rithms are based on iterative methods, which compute the successive ele ments of a sequence of approximate solutions, just like the Gauss-Seidel, Jacobi, and conjugate gradient methods [2]. We begin our discussion with a scheme for computing the ratio of two real numbers. View full abstract»

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  • Conversation Scene Analysis [Social Sciences]

    Publication Year: 2011 , Page(s): 127 - 131
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (758 KB) |  | HTML iconHTML  

    This paper discusses about conservation scene analysis. It has the potential to revitalize human-human communications. Conversation scene analysis aims to provide the automatic description of conversation scenes from the multimodal nonverbal behaviors of participants, which are captured with cameras and microphones. View full abstract»

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  • Promising Prospects in Mobile Search: Business As Usual or Techno-Economic Disruptions? [Social Sciences]

    Publication Year: 2011 , Page(s): 131 - 135
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (121 KB) |  | HTML iconHTML  

    It has taken more than a decade of intense technical and market developments for mobile Internet to take off as a mass phenomenon. And it has arrived with great intensity: an avalanche of mobile content and applications is now overrunning us. Similar to its wired counterpart, wireless Web users will continuously demand access to data and content in an efficient and user-friendly manner. View full abstract»

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  • The MPEG Musical Slide Show Application Format: Enriching the MP3 Experience [Standards in a Nutshell]

    Publication Year: 2011 , Page(s): 136 - 141
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1554 KB) |  | HTML iconHTML  

    The ISO/IEC 23000-4 MPEG-A Part 4: The Musical Slide Show Application Format (MSS AF) standard is a storage format that specifies the synchronization of MP3 audio, Joint Picture Experts Group (JPEG) images and 3rd Generation Partnership Project (3GPP) timed text data in conjunction with the descriptions for image rendering animation using MPEG-4 Lightweight Application for Scene Representation (LASeR) scene representation. The creation information for MP3 audio and JPEG images, and the color and texture descriptions for JPEG images can also be generated for richer content description using MPEG-7 metadata. By specifying such a storage format, the standard enables different multimedia contents (in this case audio, images, texts and metadata) to be integrated into a single file in a structured way. In addition to this, the standard specifies the protection and governance schemes that enable flexible rights management of the contents seamlessly. Therefore, new business models can be created with the governed contents in secured and controlled manners according to their target applications. This article provides an overview of the technologies used in the standard as well as application examples to show its benefits and advantages. View full abstract»

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  • TechWare: Mobile Media Search Resources [Best of the Web]

    Publication Year: 2011 , Page(s): 142 - 145
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    Freely Available from IEEE

Aims & Scope

IEEE Signal Processing Magazine publishes tutorial-style articles on signal processing research and applications, as well as columns and forums on issues of interest.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Min Wu
University of Maryland, College Park
United States 

http://www/ece.umd.edu/~minwu/