Electronics and Telecommunications Research Institute

Korea Telecommunication Authority

Hyun-Joo Bae

Byung-Sun Lee

Mi-Suk Lee

Hyun-Woo Kim

Jongmo Sung

Woon-Seob So

Heesik Yang

Do-Young Kim

Seung-Han Choi

Tae-Kyu Kang

Chang-Sup Keum

Kyong-Ok Yun

A method and an apparatus for encoding and decoding audio signals using adaptive sinusoidal coding are provided. The audio signal encoding method includes the steps of dividing a synthesized audio signal into a plurality of sub-bands, calculating the energy of each sub-band, selecting a predetermined number of sub-bands having a relatively large amount of energy from the sub-bands, and performing sinusoidal coding with regard to the selected sub-bands. Application of sinusoidal coding based on consideration of the amount of energy of each sub-band of the synthesized signal improves the quality of the synthesized signal more efficiently.

Method and apparatus for encoding and decoding audio signal using adaptive sinusoidal coding

An apparatus and method for testing conformance of service choreography are provided. The apparatus for testing conformance of service choreography analyzes an architecture and an operation between web services cooperating on a distributed network to test conformance of a choreography application into which the web services are combined, on the basis of a service choreography specification.

Apparatus and method for testing conformance of service choreography

Provided are a method and an apparatus for decoding an audio signal. A method for decoding an audio signal encoded by a layered sinusoidal pulse coding scheme using one or more sinusoidal pulses includes decoding the encoded audio signal, setting a smoothing frequency band of the decoded audio signal according to a layer structure of the layered sinusoidal pulse coding scheme, dividing the smoothing frequency band into one or more subbands, and smoothing the decoded audio signal on a subband-by-subband basis. Accordingly, a decoding operation time can be reduced and the quality of a synthesized signal can be improved by variably setting a frequency band to be smoothed, when decoding an audio signal encoded by a layered sinusoidal pulse coding scheme using one or more sinusoidal pulses.

Method and apparatus for decoding audio signal

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.

Method and apparatus for encoding and decoding audio signal using layered sinusoidal pulse coding

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.

Fixed mobile convergence terminal using downloadable wideband voice codec, method thereof and method of providing wideband voice codec in call control server

An Internet Set-Top Box (ISTB) and a method of providing wideband IP telephony services using the ISTB are provided, which are capable of implementing wideband voice communication services using a wideband voice codec, controlling a Real-Time Transport Protocol (RTP) packet payload to process a variety of wideband speech frame payloads, and providing high-quality wideband IP telephony services by controlling a jitter buffer to maintain conference call synchronization.

Set-top box for wideband IP telephony service and method for providing wideband IP telephony service using set-top box

An improved call distribution processing method for a called line number computation in a premium-rate service of Intelligent Network is provided. The method is capable of routing to various called numbers designated in accordance with a calling area, performing a call distribution in accordance with the capacity of a called party number, and routing to a called number since this method does not degrade call processing performance of the system. Since a system load is less, the occurrence frequency per each digit when digits from one to a hundred is performed N-times evenly occurs, and the values which was generated in the function of the random numbers does not occur in the identical pattern.

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Daejeon, South Korea

Hyun-Joo Bae