Abstract: A speech enhancement device and a method for the same are included. The device includes a down-converter, a speech enhancement processor, and an up-converter. The method includes steps of down-converting audio signals to generate down-converted audio signals; performing speech enhancement on the down-converted audio signals to generate speech-enhanced audio signals; and up-converting the speech enhancement audio signals to generate up-converted audio signals.

Abstract: A volume control apparatus and method is provided. The volume control apparatus includes an automatic gain controller and an equal loudness controller. The method includes steps of receiving an original sound signal by the automatic gain controller, adjusting the original sound signal by the automatic gain controller according to a target volume to output an auto-gain sound signal that gradually converges to the target volume, and rendering a loudness curve according to the target volume for compensating the auto-gain sound signal to output a compensated sound signal.

Abstract: A speech enhancement device and a method for the same are included. The device includes a down-converter, a speech enhancement processor, and an up-converter. The method includes steps of down-converting audio signals to generate down-converted audio signals; performing speech enhancement on the down-converted audio signals to generate speech-enhanced audio signals; and up-converting the speech enhancement audio signals to generate up-converted audio signals.

Abstract: An arbitrary step number is used in an encoding apparatus and method to encode an input data, or in a decoding apparatus and method to decode an input code. The arbitrary step number is an even number and greater than one, so that arbitrary compression ratio is available. In association with a lossless encoder further in the encoding apparatus and method, an optimum compression ratio is obtained.

Abstract: A method and apparatus of signal compression using adaptive pulse code modulation (ADPCM) with variable width frame is provided. The present invention enables a low distortion rate in the process of the ADPCM signal compression by installing a frame width modifier on the input of a code analyzer and corrector which repetitively receives compressed data and generates reference values to attain an optimal delta value for a given resolution condition that enables high compression ratio and data integrity in the data compression and decompression processes.