A study evaluated several transformations of voice fundamental frequency (F0) for use by a single‐channel vibrotactile device to supplement lipreading. The experimental procedure involved lipreading stimuli from a co...
A study evaluated several transformations of voice fundamental frequency (F0) for use by a single‐channel vibrotactile device to supplement lipreading. The experimental procedure involved lipreading stimuli from a corpus of over 1500 sentences stored on a video laserdisk [L. E. Bernstein and S. P. Eberhardt, 1986, Johns Hopkins Lipreading Corpus]. There were five experimental conditions. Three transformations of voice F0 were tested: two transformed F0 to a pulse rate code, the third employed two sine waves that were amplitude modulated as a function of F0. Condition 4 provided both F0 and a second stimulator indicating high‐frequency speech energy. Condition 5 was visual alone. Subjects were 15 normal‐hearing adults in a multiple single‐subject design with alternating baseline and test sessions. Analyses of covariance for words correct, words per stimulus sentence, and syllables per sentence showed that all subjects improved in lipreading. Subjects who received a single vibrator for voice F0 lipread more successfully than subjects who did not receive the vibrotactile supplement or who received the dual tactile stimulation.
Underwater acoustic propagation is characterized by multipath or multimode propagation. Ray theory and mode theory are not fully adequate for modeling physical reality. Impulse responses can be more accurately calcula...
Underwater acoustic propagation is characterized by multipath or multimode propagation. Ray theory and mode theory are not fully adequate for modeling physical reality. Impulse responses can be more accurately calculated using Gaussian beam theory. Signal processors can be designed to take advantage of the channel complexity if the propagation is actually known so that detectability is increased. The proposed technique, channel matched filtering, synthetically backpropagates the wave front to a hypothesized source location. Accurate passive estimates of source location can be made without knowledge of the signal characteristics. GB theory can easily accommodate a range‐dependent deep water environment. [This research supported by the Office of Naval Research.]
Techniques that treat the face holistically as a vector of pixel values, which we refer to as a monolithic representation, are still widely considered state of the art for the task of face verification in literature. ...
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Due to the explosive growth of the Internet, stream services are becoming more popular. The large media servers supporting thousands of concurrent media streams have to satisfy us with both good throughout and high av...
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ISBN:
(纸本)8955191197
Due to the explosive growth of the Internet, stream services are becoming more popular. The large media servers supporting thousands of concurrent media streams have to satisfy us with both good throughout and high availability. Although they are reciprocal from the viewpoint of system performance, the stream service continuity, as well as throughput, should be considered in clustered media servers. This is because media stream services should be continuously available to the clients even on the event of system failure. In this paper, we introduce service availability as the gauge of service degree on media servers, and present the basic scheme for guaranteeing continuous stream service. To do this, we propose LSS(Log Stream Status) and RRD(Ready Resource for instant Delivery) mechanisms. They are classified according to the status management method of stream service and the resumption method of closed service. Although these mechanisms require additional overhead, we found that they can be applied to clustered media servers with minimum overhead. Additionally, we concluded that they can provide higher quality of service availability on traditional clustered media servers.
A novel scheme is proposed for the transmission of JPEG2000 image streams over wireless channels. The proposed scheme exploits the block-based coding structure of the JPEG2000 streams and employs optimized product cod...
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As Grid Computing is becoming a reality, there is a need for managing and monitoring the available resources worldwide, as well as the need for conveying these resources to the everyday user. This paper describes a re...
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Texture is one of important features of masses in mammograms. A recent texture unit-based texture spectrum approach, referred to as Texture Unit Coding (TUC) has shown promise in texture classification. This paper pre...
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A novel approach to object-based video indexing and retrieval is presented, employing an object segmentation algorithm for the real-time, unsupervised segmentation of compressed image sequences and simple ontologies f...
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Grid computing presents a new trend to distributed computation and Internet applications, which can construct a virtual single image of heterogeneous resources, provide uniform application interface and integrate wide...
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