Electronics and Telecommunications Research Institute

Kwangwoon University Industry-Academic Collaboration Foundation

Samsung Electronics Co., Ltd.

Ho Chong Park

Tae Jin Lee

Jin Woo Hong

Dae Young Jang

Kyeongok Kang

Young-cheol Park

Chieteuk Ahn

Jeongil Seo

Seungkwon Beack

Min Soo Kim

Min Je Kim

Seung Kwon Beack

Eun Mi Oh

Jung Hoe Kim

Young-Cheol Park

A Unified Speech and Audio Codec (USAC) that may process a window sequence based on mode switching is provided. The USAC may perform encoding or decoding by overlapping between frames based on a folding point when mode switching occurs. The USAC may process different window sequences for each situation to perform encoding or decoding, and thereby may improve a coding efficiency.

Unified speech/audio codec (USAC) processing windows sequence based mode switching

An encoding apparatus and a decoding apparatus in a transform between a Modified Discrete Cosine Transform (MDCT)-based coder and a different coder are provided. The encoding apparatus may encode additional information to restore an input signal encoded according to the MDCT-based coding scheme, when switching occurs between the MDCT-based coder and the different coder. Accordingly, an unnecessary bitstream may be prevented from being generated, and minimum additional information may be encoded.

Encoding apparatus and decoding apparatus for transforming between modified discrete cosine transform-based coder and different coder

Unified speech/audio codec (USAC) windows sequence based mode switching

Unified Speech/Audio Codec (USAC) processing windows sequence based mode switching

An audio signal quality enhancement apparatus and method. The apparatus includes a pitch calculating unit to extract a pitch period of an audio signal, a frequency domain transforming unit to transform the audio signal to a frequency domain, a frequency band dividing unit to classify the transformed audio signal into audio signals for each of the plurality of frequency bands based on the extracted pitch period, and a pitch enhancement unit to determine a gain based on a volume of the transformed audio signal, and to generate an output signal by multiplying each of the classified audio signals with respect to each of the plurality of frequency bands by the gain, thereby enhancing quality of the audio signal.

Audio signal quality enhancement apparatus and method

Growing community of inventors

Seongnam-si, South Korea

Ho Chong Park