Ki-hyun Choo

Ki-hyun Choo: A Pioneer in High Frequency Decoding and Signal Encoding

Ki-hyun Choo, a prolific inventor based in Seoul, KR, holds an impressive portfolio of 100 patents. Known for his ground-breaking contributions to high frequency decoding and signal encoding, Choo's latest inventions include a method and apparatus for high frequency decoding for bandwidth extension, and a spectrum coding method and apparatus.

The high frequency decoding for bandwidth extension method and apparatus are designed to improve the sound quality of restored sound signals without increasing complexity. The method involves decoding an excitation class, transforming a decoded low frequency spectrum based on the excitation class, and generating a high frequency excitation spectrum on the basis of the transformed low-frequency spectrum.

Choo's innovation in spectrum coding method and apparatus includes quantizing spectral data of a current band based on a first quantization scheme, generating a lower bit of the current band using the spectral data and the quantized spectral data, quantizing a sequence of lower bits including the lower bit of the current band based on a second quantization scheme, and generating a bitstream based on an upper bit.

Choo's exceptional skills in innovation and inventions earned him key positions at prestigious organizations like Samsung Electronics Co. Ltd. and Industry-University Cooperation Foundation Hanyang University Erica Campus. He worked alongside some of the industry's brightest minds, including Eun-mi Oh and Ho-sang Sung.

Choo's contributions to the field of high frequency decoding and signal encoding have been nothing short of revolutionary. The methods and apparatus he has developed have paved the way for a new era of audio and video coding technology. We can expect much more from this brilliant inventor in the years to come.