Abstract:
Provided are a method and an apparatus for encoding and decoding an audio signal. A method for encoding an audio signal includes receiving a transformed audio signal, dividing the transformed audio signal into a plurality of subbands, performing a first sinusoidal pulse coding operation on the subbands, determining a performance region of a second sinusoidal pulse coding operation among the subbands on the basis of coding information of the first sinusoidal pulse coding operation, and performing the second sinusoidal pulse coding operation on the determined performance region, wherein the first sinusoidal pulse coding operation is performed variably according to the coding information. Accordingly, it is possible to further improve the quality of a synthesized signal by considering the sinusoidal pulse coding of a lower layer when encoding or decoding an audio signal in an upper layer by a layered sinusoidal pulse coding scheme.
Abstract:
A method and an apparatus for controlling a computing capacity are provided. The method includes: receiving a computing resource deposit request signal from a first computer; determining appropriateness of the computing resource deposit request signal; allocating computing resources deposited by the first computer to a second computer when the computing resource deposit request signal is appropriate; and storing information on the computing resources deposited by the first computer and the computing resources allocated to the second computer in accounts for the first and second computers.
Abstract:
A method of processing an open asynchronous application service event and an open web service gateway implementing the method are provided. The open web service gateway includes: a plurality of SCFs (service capability features) operatively connected to an application service through a web service interface, receives an event registration request from the application service, and notifies an event occurring in a network to the application service; and an event broker registering the registration-requested based on a predetermined policy in correspondence with the SCFs, when the registration-requested event received from the application service is an asynchronous event, and notifies an occurrence of the event in the network to the SCFs according to a registered priority of the event. Accordingly, an asynchronous event is registered and notified based on a predetermined policy, so that it is possible to prevent event registration conflict between the SCFs and between the application services and to maximize network operation efficiency.
Abstract:
A fixed mobile convergence terminal using a wideband voice codec is provided. The fixed mobile convergence terminal includes a communication unit configured to connect to a network, and a control unit configured to download a wideband voice codec identical to a wideband voice codec of an opposite party terminal from a call control server in a call setting with the opposite party terminal through the communication unit, so that a high-quality voice call function is achieved.
Abstract:
Provided are an apparatus for creating a workflow of a composition web service and a functionality information construction method for creating a workflow of a composition web service. The apparatus and method analyze procedural knowledge described in web documents to normalize and continuously accumulate functionality information required for performing a task, and automatically configure a workflow of a composition web service by combining pieces of the accumulated functionality information, thereby solving the problem of a discordance occurring when one composition web service is configured by dynamically combining multiple different web services.
Abstract:
A method of providing session mobility and a user terminal are provided. The method includes, when a session is set through one interface, receiving a request for session transfer to a network corresponding to another interface, checking the available resource capacity of the network to which the session will be transferred, and determining whether or not to transfer the session based on the result of the check operation and establishing a session with the network. The method can improve the reliability of an Internet protocol (IP) multimedia subsystem (IMS) service continuity function.
Abstract:
Provided are an apparatus and method for learning and modeling a user's service use pattern. The method includes: collecting information about a service selected by the user and situation information of the user when selecting the service; learning the user's service use pattern based on the collected information; and updating a learning value of a corresponding context-service pair in a user model, which is comprised of context-service pairs, based on the learning result, wherein the situation information of the user includes one or more contexts.
Abstract:
Provided is a method and apparatus for controlling congestion of a node in an ad-hoc network comprising: classifying a channel state into a busy channel state and an idle channel state and then monitoring the channel state; performing contention for acquiring a channel with neighboring nodes when data to be transmitted is present during the monitoring of the channel state; calculating an available bandwidth on the basis of the channel state when wins the contention; and determining the amount of data to be transmitted on the basis of the available bandwidth. The nodes in the ah-hoc network monitor their own wireless channel state so as to obtain channel contention information, calculate an available bandwidth from the channel contention information, and control a transmission amount on the basis of the available bandwidth. Accordingly, the nodes can avoid excessive traffic which exceeds channel capacity. Channel contention, which is the most immediate and important cause of a decrease in network performance, can be loosened.
Abstract:
A method and apparatus for measuring the quality of a video provided in an IP network based media service is provided. The apparatus for measuring Quality of Experience (QoE) guaranteed real-time Internet Protocol (IP)-media video quality, includes: a receiver receiving a transmission video provided through an IP network service platform and an original video corresponding to the transmission video, and extracting frames of the transmission video and the original video; a detector comparing the frames of the transmission video and the original video in real time to obtain a difference between the frames of the transmission video and the original video and detecting a matching segment between the transmission video and the original video; and a measurement unit calculating a QoE parameter using the frames of the transmission video and the original video which correspond to the matching segment.
Abstract:
A post-filtering apparatus and method for speech enhancement in a modified discrete cosine transform (MDCT) domain are disclosed. In the apparatus and method, previous and current MDCT coefficients are used for obtaining a speech spectrum coefficient similar to a real speech spectrum, and a convex function is used for transforming the speech spectrum coefficient and obtaining a post-filter coefficient so that difference can increase in the case where the speech spectrum coefficient is small but decrease in the case where the coefficient is large. Then, the post-filter coefficient is applied to the MDCT coefficient. With this configuration, both the current and previous MDCT values are used, so that it is possible to obtain a spectrum coefficient similar to the real speech spectrum and to obtain a more accurate filter coefficient. Further, the coefficient is adaptively transformed through the convex function, thereby enhancing speech quality.