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When TV recommender systems perform well, number of interactions in which their users expressed positive feedback on the recommended content is expected to be greater than the number of negative ones. This is known as class imbalance and, paradoxically, it degrades the system performance by making the identification of the programs the user will dislike increasingly difficult. As the misclassification of the unwanted content is easily perceived by TV viewers, it should be avoided by all means. In this paper, a personalized TV program guide based on neural network is described. It is shown how class imbalance information can be exploited in learning the user preferences. This not only improves the system performance, but increases the user satisfaction as well.1 [ABSTRACT FROM AUTHOR]

This paper presents a receive power analysis system for DTV broadcasting networks. This system measures the receive power and channel information simultaneously, analyzes the receive power of the measured multipath components and constructs 360 degree receive power profile by repeating analysis in all antenna directions. The proposed receive power analysis algorithm is proved by laboratory tests with two distributed translators. Field test results are briefly introduced and discussed for the evaluation of the proposed system. [ABSTRACT FROM AUTHOR]

Consumers are flooded with amounts of discount coupons, oftentimes for products that are far from their interests. This marketing custom is already rising on the Internet and is imminent in Digital TV, where the massive sending of coupons leads to their devaluation and consumer indifference. The computing capabilities of these media permit to alleviate this problem by means of recommender systems, which are very useful tools in application domains that suffer from information overload. However, current recommender systems overlook the diversity of products and services available in the market, which gives rise to forming fake neighborhoods in collaborative filtering strategies. In this paper, we apply semantic reasoning techniques to avoid such fake neighborhoods and, thereby, improve the recommendation process. Furthermore, taking advantage of the Digital TV medium, we propose matching the recommended coupons to TV contents semantically related with them, in order to increase their redemption. [ABSTRACT FROM AUTHOR]

Interference to DTV reception from signals in the 88-108 MHz FM broadcast band has been observed since the end of analog TV broadcasting in June, 2009. This interference is generated in the front-end (tuner) of the affected receiver. This paper describes the non-linear mechanisms in the receiver by which FMI to DTV reception takes place. The author has tested 15 models of NTIA approved DTV down-converters measuring the increase in DTV received signal power required as a function of the power of local off-air FM signals in his laboratory. He has also tested "amplified indoor antennas" and found their performance was seriously impaired by FMI. This work was carried out as unsponsored research. [ABSTRACT FROM AUTHOR]

This paper introduces a promising property in which the transmitter of an OFDM system can utilize an N-point IFFT operation to build the time-domain symbols of a KN-point IFFT operation. Based on this property, we propose a flexible OFDM structure. This structure will support uplink applications which include many transmitters using different numbers of subcarriers and one receiver with just one IFFT/FFT module with the subcarriers of least common multiple (LCM) for the number of subcarriers of all the transmitters. Therefore it reduces the design complexities of the receiver and increases the compatible characteristics for consumer electronics (CE). Compared with the original OFDM system, the proposed system improves the performance of the packet error ratio (PER) and the bit error ratio (BER) performance by using the appropriate K. In addition, the proposed structure can be designed to enlarge the bandwidth efficiency of the system and improve the performance of channel estimation compared, with the OFDM/TDM system. [ABSTRACT FROM AUTHOR]

In this paper, we propose a fine edge-preserving image interpolation algorithm based on local gradient features. The proposed algorithm determines the edge direction using horizontal and vertical gradient operators, and then the edge direction is conceptually changed to the position between adjacent pixels. Since our algorithm is independent of interpolation kernels, various conventional kernels can be implemented. Experimental results show that the proposed methods can preserve clear edges and reduce blurring artifacts. [ABSTRACT FROM AUTHOR]

When using a finite DTV stream, discontinuity phenomena, such as a black or paused screen in the case of video and irregular or popping sounds in the case of audio, are generally experienced at the loop-back point. As the transmission time of the transport stream (TS) is commonly longer than the presentation time of video sequences, this causes an element stream (ES) buffer underflow at the loop-back point of the TS. Therefore, this paper proposes a time-matching multiplexing method for endless loop-back playing to resolve the discontinuity problem. Equations are developed to match the play times of the source, TS, and ES in consideration of the special TS transmission rate. In addition, new multiplexing methods are used to generate a TS to match the minimum matching time (MMT). Experimental results show that the MMT stream effectively eliminates any discontinuities. [ABSTRACT FROM AUTHOR]

Digital television/terrestrial multimedia broad- casting (DTMB), announced as the Chinese digital television terrestrial broadcasting (DTTB) standard, uses pseudo-noise (PN) sequence as guard interval (GI) and the training sequence for both multi- and single-carrier block transmissions. The conventional channel estimation methods can be performed through either the subtraction of the PN sequence or the cancellation of residual inter-symbol interference (181). In this paper, a novel iterative method is introduced to estimate the overlapping part of PN sequence, meanwhile the channel impulse response (CIR) estimation can be obtained and updated via the reconstruction of the PN sequence in an iterative manner. Simulations show that the proposed algorithm can effectively reduce the ISI and improve the symbol error rata (SER) of DTMB system over slow- varying broadcasting multipath channel even with long delay spread. In practice, the proposed algorithm can be applied to the DTMB receiver-chip directly with low-complexity cost. [ABSTRACT FROM AUTHOR]

Current satellite digital broadcasting transmission system "ISDB-S " employs digital modulation schemes, BPSK, QPSK, and 8PSK combined with a concatenated code consists of convolution code and Reed- Solomon code. While, in recent years, transmission systems adopted LDPC codes have been developed. Multi-level digital modulation schemes combined with LDPC codes can achieve more efficient transmission. In this paper, we propose a new transmission system employed LDPC, multi-level modulation and advanced TMCC signal. [ABSTRACT FROM AUTHOR]

Despite the ,nanr advantages in digital Th users get i,tto difliculties when titer navigate channels to fin their preferred programs. This is because the number channels is much more and the c/tunnel zapping speed i much slower i,t digital TV than in analog one. There hay been many efforts to reduce the channel zapping debt' I dj~gita/ TV However, the reduction of channel zapping dela is limited by the Itatu,-e of digital TVsvste,n. In this paper. w aropose alternative approaches that enable the efficien channel navigation in digital TV. The first approach is to hid a channel change delay. T/tis apptvarh is helpful when t/, user wants to navigate channels hr pressi,tg up/down button in a full screen ,ttode. The second approac/t is to show multt channel mosaic screen. This is helpful when the user wants navigate channels by pressing finn-tray l,uttons whil watching preview videos. In this paper, we propose a Circula Buffering Algorithm ((`BA) and show that, with help of th CB.4, hiding channel change delay and n,t,lti-chatttte/ ntosai tcreen con he foasible in the system with limited resource,~ Simulation results shotr that the proposed methods gire user high satisfaction in channel navigation. [ABSTRACT FROM AUTHOR]

Despite the ,nanr advantages in digital Th users get i,tto difliculties when titer navigate channels to fin their preferred programs. This is because the number channels is much more and the c/tunnel zapping speed i much slower i,t digital TV than in analog one. There hay been many efforts to reduce the channel zapping debt' I dj~gita/ TV However, the reduction of channel zapping dela is limited by the Itatu,-e of digital TVsvste,n. In this paper. w aropose alternative approaches that enable the efficien channel navigation in digital TV. The first approach is to hid a channel change delay. T/tis apptvarh is helpful when t/, user wants to navigate channels hr pressi,tg up/down button in a full screen ,ttode. The second approac/t is to show multt channel mosaic screen. This is helpful when the user wants navigate channels by pressing finn-tray l,uttons whil watching preview videos. In this paper, we propose a Circula Buffering Algorithm ((`BA) and show that, with help of th CB.4, hiding channel change delay and n,t,lti-chatttte/ ntosai tcreen con he foasible in the system with limited resource,~ Simulation results shotr that the proposed methods gire user high satisfaction in channel navigation. [ABSTRACT FROM AUTHOR]

This paper presents a network adapted selective frame-dropping algorithm for streaming media over the Internet, which aims to address the problem of random packet losses resulted from network bandwidth mismatching. The basic idea is to first determine a sending window for each GOP according to its rendering time interval, and then selectively drop some frames with low priority to ensure that other more important frames in this GOP can be reliably delivered to the receiver within the time limitation of the GOP s sending window. For each GOP, the frame-dropping policies are determined in advance according to the transmitting results of its preceding GOP, and then slightly re-adjusted after each frame has been sent according to the current available network bandwidth. Experimental results show that the proposed algorithm can achieve free-error and fluent rendering effects even in the case of worse network conditions. [ABSTRACT FROM AUTHOR]

Intelligent digital TV (iDTV) is a future digital TV with intelligence which can automatically provide user-personalized services for each audience. For the user-personalized services, the iDTV should recognize audiences in real-time. In this paper, we define a novel structure of the iDTV and propose a real-time person identification system in the iDTV that analyzes captured images and recognizes audiences. The proposed system consists of three processing units: preprocessing for reducing computational costs of the proposed system, face detection using a statistical approach, and face recognition using Support Vector Machines (SVMs). Experimental results show that the proposed system achieves efficient performance with high recognition accuracy of 90% or higher at the speed of 15∼20 fps, which is suitable for the iDTV. [ABSTRACT FROM AUTHOR]

This paper presents a scheme to dynamically match capabilities of content sinks and media formats of items supplied by content sources to improve interoperability among a wide range of networked CE devices. The scheme proposes the use of transcoders located in external networks (e.g. Internet) when a match is not found locally. Here "media format" refers to the combination of content encoding format and packaging or transport method used to make available the content item on the network. Existing capability matching methods rely on standard repositories agreed a priori such as MIME (Multipurpose Internet Mail Extensions) media types, and DLNA (Digital Living Network Alliance) media format profiles. The proposed scheme based on external transcoders enables support of profiles based on newly invented formats or new combinations of existing formats and packaging or transport methods. This extensible approach makes possible rendering of content items available in media profiles unknown to the renderer. Our capability matching scheme improves media interoperability when compared with existing methods. [ABSTRACT FROM AUTHOR]

Data Broadcasting service is an essential part of the digital broadcasting and provides diverse services by exploiting underlying digital transmission technology. Thus various middleware standards for data broadcasting have been established by international organizations such as MHP of DVB, DASE and ACAP of ATSC and BML of ARIB. On the other hand, these multiple incompatible middlewares result in complicated problems, i.e. extra cost for redundant application development, duplicated middleware implementation and interchange problem of data contents over different middleware specifications. By suggesting one of a solution to this engineering problem, this paper proposes an integrated data broadcasting architecture based on the component-based approach. Through the precise comparison and analysis of each middleware standards, we identifying the characteristics of each middleware and integrate the core component of data broadcasting in the design, thus our architecture can be flexibly compatible with various standards. We expect that this integration can solve the preceding problems by the proposed architecture. [ABSTRACT FROM AUTHOR]

In this paper we introduce a cooperative environment between the Interactive Digital TV (IDTV) and the networked home with the aim of allowing the interaction between interactive TV applications and the controllers of the in-home appliances in a natural way. Concretely, we have selected the MHP (Multimedia Home Platform) standard, well-known in the IDTV field, and OSGi (Open Service Gateway Initiative), the most widely used open platform to set up Residential Gateways. To overcome the radically different conceptions below these two specifications we define a new kind of application, coined as XbundLET, which acts as a bridge between both worlds allowing MHP applications to use the OSGi services and vice versa, i.e., allowing OSGi applications to take advantage of the MHP functionality. As a further step towards integrated Residential Gateways, we also propose a semantic description for OSGi services at the smart home that facilitates services discovery and invocation from broadcast MHP applications. [ABSTRACT FROM AUTHOR]

The next generation consumer level interactive services require reliable and constant communication for both mobile and static users. The Digital Video Broadcasting ( D VB) group has exploited the rapidly increasing satellite technology for the provision of interactive services and launched a standard called Digital Video Broadcast through Return Channel Satellite (DVB-RCS). DVB-RCS relies on D VB-Satellite (D VB-S) for the provision of forward channel. The Digital Signal processing (DSP) implemented in the satellite channel adapter block of these standards use powerful channel coding and modulation techniques. The investigation is concentrated towards the Forward Error Correction (FEC) of the satellite channel adapter block, which will help in determining, how the technology copes with the varying channel conditions and user requirements. [ABSTRACT FROM AUTHOR]

This paper presents a new economic and effective TPEG (transport protocol experts group) application for location based service (LBS) that can be provided in terrestrial-digital multimedia broadcasting (T-DMB) transmission system. We propose a novel point-of-interest (POI) application interoperable with TPEG protocol, and introduce the POI data server/client and the DMB receiver with TPEG decoder implemented by using the proposed protocol. The stability and effectiveness of the proposed protocol is verified through the experimental broadcasting, and the pilot service using the commercial T-DMB network is being provided successfully. [ABSTRACT FROM AUTHOR]

Nowadays, the progression of digital broadcasting has been toward establishing a user-friendly TV watching environment through personalized broadcasting services. In the consumer domain, video content filtering enables personalized broadcasting service in which a TV viewer obtains desired scenes even from live broadcasts which can not possess metadata. In this paper, therefore, we propose a new real-time content filtering system for live broadcasts which can be applied to TV terminals such as the set-top box and personal video recorder. Based on the proposed filtering, the TV viewer can watch not only favorite broadcasts of a main channel, but also get desired scenes from live broadcasts of other channels simultaneously. The usefulness of the proposed broadcasting content filtering is verified with sport videos on a test-bed broadcasting system. [ABSTRACT FROM AUTHOR]

The generalized arrival of the Digital TV will bring a significant increase in the amount of channels and programs available to end users, with many more difficulties for them to find interesting programs among a myriad of irrelevant contents. Thus, automatic content recommenders should receive special attention in the following years to improve the assistance to users. Current approaches of content recommenders have important well-known deficiencies, which difficult their wide acceptance. In this paper, a new approach for automatic content recommendation is presented, based on the so-called Semantic Web technologies, that significantly reduces those deficiencies. The approach has been implemented in the AVATAR tool, a hybrid content recommender that makes extensive use of well-known standards, such as MHP, TV-Anytime, or OWL. [ABSTRACT FROM AUTHOR]

Vestigial sideband (VSB) modulation for digital television (DTV) systems transmits a training sequence called field sync (FS) every 313 segments with a period of 24.2 ms. The field sync sequence, however, is not long enough to guarantee the operation of an equalizer. So it requires many field sync sequences for the convergence of an equalizer with long taps in severely distorted channels. In this paper, a sparse equalizer using a data-recycling algorithm is proposed for fast convergence of the equalizer in 8-VSB systems. The proposed sparse equalizer with a data-recycling algorithm, utilizing one FS sequence for several times, selects effective equalizer taps for channel equalization and improves the convergence speed and output signal-to-noise ratio (SNR). The effectiveness of the proposed equalizer is evaluated from the points of the output SNR, convergence speed, and the number of required taps in Brazilian test channels and a single ghost dynamic channel. [ABSTRACT FROM AUTHOR]

An FEC (Forward Error Correction) assignment scheme for Motion JPEG2000 is proposed, which is dedicated to video transmission over wireless network. While most existing unequal error protection code assignment schemes are based on trial-and-error iterations, which are computationally intensive and thus unsuitable for real-time applications, the proposed scheme uses the slope of the Rate-Distortion curve to choose a code for each quality layer. The FEC code for the first layer is chosen so that the probability of error in the layer is limited to a given permissible range. Comparison with conventional schemes demonstrates that the proposed scheme can provide the PSNR performance similar to that of conventional schemes, while its execution time is much lower. [ABSTRACT FROM AUTHOR]

This paper proposes a novel architecture for DTV (Digital TV) using middleware based on UPnPTM (Universal Plug and Play) and DLNA (Digital Living Networking Alliance) to enable interoperability with a variety of digital CE devices supporting content of diverse formats transported over IP (Internet Protocol) and IEEE 1394. Additionally, content metadata, capability discovery, and format transcoding features are included to match device capabilities with media formats to enable rendering of content on diverse digital CE devices interacting with the DTV. [ABSTRACT FROM AUTHOR]

Interpolation filters are widely used in symbol timing recovery systems to interpolate new sample values at arbitrary points between the existing discrete-time samples. This paper presents an efficient way to implement polynomial interpolation filters based on the analysis of constraints which are used for optimization. The proposed technique does not require two sub-filters in the well-known Farrow structure, which leads to a very efficient interpolator. Implementation examples are included illustrating the efficiency of the proposed method. [ABSTRACT FROM AUTHOR]

This paper introduces T-DMB transmission system in Korea based on Eureka-147 DAB and presents a new architecture of transmission system for digital multimedia services. For transmission of the digital multimedia contents in mobile environment by using the existing DAB, we developed a T-DMB processor which performs T-DMB encoding and insertion of the media stream into the existing DAB transmission system. After the implemented T-DMB processor can be connected to the front of the commercial Eureka-147 DAB system, and the performance of the T-DMB system is confirmed through the T-DMB experimental broadcasting in Korea. [ABSTRACT FROM AUTHOR]

This paper presents a DVB-T receiver system based on the OFDM modulation method, which has exhibited a good reception performance even with obstacles and a mobile reception. As such, an improved OFDM receiver is developed for a 13 VB-T system that also considers function expansion for further development Experiments confirmed the performance of the proposed DVB-T receiver, plus a GUI and EPG are developed for the DTV user. [ABSTRACT FROM AUTHOR]

In this paper, according to the multi-channel model of the fractionally spaced linear equalizers, the symbol-spaced adaptive decision feedback equalizers (ADFE) are extended to the fractionally spaced adaptive decision feedback equalizers (FSADFE) naturally. We applied FSADFE to the ATSC DTV receivers. The ADFE converges very slowly when the channel presents severe characteristic, which results in the poor performance. FSADFE can make up this weakness of ADFE, and the gain of performance between them is considerable. This gain benefits the DTV receivers, especially in some severe channels. [ABSTRACT FROM AUTHOR]

Extensive researches have been conducted to enhance robustness for Internet video transmission. It has been found that feedback channel is an effective tool to provide error recovery ability and it is most suitable for interactive and conversational environments. Multiframe is another useful approach to enhance both coding efficiency and robustness. In this paper, we propose an algorithm which combines feedback channel and multiframe to achieve rapid error recovery ability for H.264 video. Simulation results show that our scheme can best utilize the feedback information. At the end of this paper, its application in conversational services such as Internet videophone is discussed. [ABSTRACT FROM AUTHOR]

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 can 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. [ABSTRACT FROM AUTHOR]