Phiaton Corporation

Cresyn Co., Ltd.

Soongsil University

Jong-Bae Lee

Seong-Soo Lee

Sang Ho Jin

An inverse transform method and apparatus for a video codec are disclosed. The inverse transformer can include: a first inverse transform unit configured to perform an inverse transform operation on an even column portion of a 2n&#xd7;2n block or an n&#xd7;n block sharing inverse transform coefficients; and a second inverse transform unit configured to store coefficients according to a first input mode and a second input mode and configured to select coefficients according to input mode and multiply the selected coefficients with an input value to perform an inverse transform of an odd column portion of a 2n&#xd7;2n block or an n&#xd7;n block.

Inverse transform method and apparatus for video codec

Headphone

A headphone having a waveguider is disclosed which can control the amount of air flowing into the headphone. The headphone includes: a housing having a receiving space therein and at least one or more air inlets at one side thereof, in which the housing is opened at the front side thereof a speaker placed in the receiving space, for generating audio sounds according to input electrical signals; a cover for closing the front side of the housing, the cover forming a plurality of audio sound through-holes through which the audio sounds from the speaker pass; and a waveguider slidably and rotatably installed to the housing. The waveguider includes a kernel part protrudently formed, for guiding the audio sounds passing through the cover to the inner ear, and an opening/closing part for closing at least one or more air inlets according to a rotation angle thereof to control the amount of air that instantly flows into the housing. The waveguider is slidably and rotatably moved to partially or completely close a plurality of air inlets formed in the housing. Therefore, the amount of air flowing into the housing can be controlled and thus the intensity of the bass can be adjusted.

Headphones with waveguider

Speaker for digital media player

Growing community of inventors

Seoul, South Korea

Jong-Bae Lee