Samsung Electronics Co., Ltd.

Electronics and Telecommunications Research Institute

Kwangwoon University Industry-Academic Collaboration Foundation

Ho-Chong Park

Jin-Woo Hong

Jeong-Il Seo

Dae-Young Jang

Dong-Gyu Sim

Yong-beom Lee

Chang-yong Son

Seung-Kwon Beack

Chang-Beom Ahn

Woo-suk Lee

Tae-Jin Lee

Yung-Lyul Lee

Young-Ky Kim

Jin-Woong Kim

Seoung-Jun Oh

Jae-Gon Kim

Young-cheol Park

Hae-Chul Choi

Se-Yoon Jeong

Kyeong-Ok Kang

In-Seon Jang

Kyung-Ae Moon

Su-Yeol Jeon

Min-Je Kim

Rin-Chul Kim

Seong-Jun Oh

Provided are an apparatus for multi-stage transforming a plurality of unit blocks in multi-dimension that can improve compression efficiency of video data by collecting Discrete Cosine Transforming (DCT) coefficients of neighboring blocks and performing an additional transformation based on the DCT coefficients of an original picture and a differential picture. The method includes the steps of: performing a Discrete Cosine Transform (DCT) on inputted picture data and selecting R blocks of a predetermined size from DCT picture data, where R is a natural number equal to or greater than 2; arranging DCT coefficients of each of the selected R blocks according to each frequency in one-dimension; and performing one-dimensional transformation again on the DCT coefficients arranged in one-dimension.

Multi-dimensional and multi-stage transforming apparatus and method

A speech compression apparatus including: a first band-transform unit transforming a wideband speech signal to a narrowband low-band speech signal; a narrowband speech compressor compressing the narrowband low-band speech signal and outputting a result of the compressing as a low-band speech packet; a decompression unit decompressing the low-band speech packet and obtaining a decompressed wideband low-band speech signal; an error detection unit detecting an error signal that corresponds to a difference between the wideband speech signal and the decompressed wideband low-band speech signal; and a high-band speech compression unit compressing the error signal and a high-band speech signal of the wideband speech signal and outputting the result of the compressing as a high-band speech packet.

Speech compression and decompression apparatuses and methods providing scalable bandwidth structure

An apparatus and method for deciding an adaptive noise level for bandwidth extension are provided. The apparatus includes a noise level decider for deciding a high-band noise level for bandwidth extension according to tonality of an input signal, a pitch frequency analyzer for detecting a pitch frequency of the input signal and analyzing correlation between the detected pitch frequency and a frequency channel, and a noise level controller for adaptively controlling the decided high-band noise level based on the analyzed correlation of the pitch frequency and the frequency channel.

Apparatus and method for deciding adaptive noise level for bandwidth extension

An echo canceler for canceling an echo signal mixed in an input signal received from a hybrid circuit. The echo canceler has a double filter structure comprised of an adaptive filter and a fixed filter. The adaptive filter receives the input signal to generate a first echo estimation signal according to a filter coefficient thereof, and the fixed filter receives the input signal to generate a second echo estimation signal according to a filter coefficient thereof. A first adder subtracts the first echo estimation signal from the input signal to generate a first echo-canceled signal, and a second adder subtracts the second echo estimation signal from the input signal to generate a second echo-canceled signal. A mode selector selectively outputs one of the first and second echo-canceled signals having a relatively more canceled echo component.

Echo canceler and method thereof

Growing community of inventors

Gyeonggi-do, South Korea

Ho-Chong Park