摘要:
There are provided a search method of a fixed codebook, and more particularly, a focused search method and apparatus thereof, for being applied to a speech codec for Voice over Internet Protocol (VoIP). The focused search method of the fixed codebook includes: calculating absolute values of correlation vectors of respective pulse locations of tracks 0, 1, 2, and 3 and arranging the pulse locations in a descending order of the absolute values; and selecting a predetermined number of pulse locations for each track among candidate pulse locations arranged and conducting focused search of the selected result. Therefore, it is possible to significantly reduce a calculation amount required for fixed codebook search while maintaining tone quality in a similar level.
摘要:
Provided are a combined, fixed codebook searching method and apparatus used in a code excited linear prediction (CELP) speech codec. The method is used in a code excited linear prediction (CELP) speech codec, and includes searching for a fixed codebook using a full search method that searches for the fixed codebook at all pulse positions; selecting a fixed codebook searching method by counting the number of users who are accessing a gateway, comparing the number of users with a predetermined threshold, and selecting a proper fixed codebook searching method based on the result of comparison; searching for the fixed codebook using the selected fixed codebook searching method; and checking whether the search for the fixed codebook is complete for all tracks of the CELP speech codec, terminating a routine of searching for the fixed codebook when it is determined the search is complete for all the tracks, and selecting a fixed codebook searching method again in consideration of the number of gateway users when there remains a track to be searched for. Accordingly, a fixed codebook searching method is selected in consideration of the number of users who are accessing a gateway, thereby enabling an effective adjustment of either the quality of sound or the channel capacity of the gateway.
摘要:
The present invention overcomes problems of tandem coding method such as degradation of speech quality, increased system latency and computations. An apparatus for trans-coding between code excited linear prediction (CELP) type codecs with different bandwidths, includes: a format parameter translating unit for generating output formant parameters by translating formant parameters from input CELP format to output CELP format; a formant parameter quantizing unit for receiving the output format formant parameters and quantizing the output format formant filter coefficients; an excited parameter translating unit for generating output excitation parameters by translating excitation parameters from input CELP format to output CELP format; and an excitation quantizing unit for receiving the output format excitation parameters and quantizing the output format excitation parameters.
摘要:
Provided are a user authentication apparatus and method for supporting PMIPv6 (Proxy Mobile Internet Protocol version 6) in next generation networks. Authentication and mobility signaling protocol can be performed without having an additional signaling process when a mobile terminal moves by extending user profiles of the next generations to support the PMIPv6.
摘要:
Provided are methods for network ID based federation and single sign on authentication. A method of federating a service providing site in a service network with an access network for web application service authentication in a next generation network (NGN), the method comprising requesting the user equipment for authentication in correspondence with the federation request and inquiring whether to perform the federation, when a federation request is received from user equipment which has been authenticated by the access network; receiving responses to the authentication request and the inquiry from the user equipment; and registering the access network with a user federation list and notifying the federation to the access network, when authentication is determined to be successful from the response.
摘要:
A system and method for providing an interactive multimedia service to a user in an access network are provided. The system includes a multimedia service providing server and a user terminal. The multimedia service providing server creates multimedia information requested by a user terminal, processes the created multimedia information, and manages a corresponding communication channel to allow a predetermined user terminal to receive the processed multimedia information. The user terminal transmits inputted user multimedia information to the multimedia service providing server through the access network and receives the multimedia information transmitted from the multimedia service providing server through the access network.
摘要:
Provided is a method of scheduling an output in a crosspoint buffered switch by searching whether a cell exists in a crosspoint buffer at a start position for each output port, wherein the crosspoint buffer at the start position is a crosspoint buffer at a predetermined position among the crosspoint buffers respectively corresponding to output ports, outputting all cells stored in the crosspoint buffer at the start position and searching for a cell in a crosspoint buffer at a next position, outputting all cells stored in the crosspoint buffer at the next position and searching for a cell in the crosspoint buffer in a next position to the crosspoint buffer at the final position, and outputting all cells stored in the crosspoint buffer at the final position and searching for a cell in the crosspoint buffer at the start position.
摘要:
Provided is a method for setting a security channel between an OLT and at least one ONU in an EPON. In detail, a channel is generated by which the OLT makes a reciprocal security capability agreement with the ONU that wants to set a security channel in a discovery interval and then automatically registers the ONU with the security capability agreement. The security channel is set by which the OLT distributes an encryption key for the security with the ONU completed with the security capability agreement. A renewal point of the encryption key is shared by transmitting a message indicative of a time to change the encryption key between the OLT and the ONU both completed with the encryption key distribution.
摘要:
An apparatus for providing I-centric services using a service delivery platform which is user-centric layered and a service providing method using the same are provided. The apparatus includes a media service platform providing an enabler obtained by abstracting resources and an I-centric enabler, a service creation environment providing a layered service creation and execution environment for each user, and a service execution environment. A personal user, a third party service provider and a service provider can create and provide various personalized services using the media service platform, the service creation environment and the service execution environment.
摘要:
Provided is a TDMA (time division multiple access) PON (passive optical network) OLT (optical line terminal) system for a broadcast service, including packet processor determining information according to types of frames (unicast, multicast, and broadcast frames) and a switch output port using header information (an IP address of a packet header, MAC (medium access control) addresses of Ethernet frames, and the like) of data received from an external node or the ONT (optical network terminal) and attaching the information to header parts of the frames to generate second data, a switch copying the second data by a predetermined number of times according to a transmission method and transmitting the second data to a corresponding destination output port according to the identification codes, M TDMA PON MAC processors removing the identification codes added to the second data and converting the second data into TDMA PON frames, and M optical transceivers converting the TDMA PON frames into optical signals and transmitting the optical signals to an ONT.