SYSTEM FOR IMPROVING SOUND QUALITY IN STFD TYPE HEADSET

摘要

PURPOSE: A sound quality improvement system for STFD is provided to implement an excellent application technology by increasing the sound quality of high frequency bandwidth. CONSTITUTION: An LP(Linear Prediction) analyzing unit(130) obtains an LP residual signal by using low frequency sampling data. The LP analyzing unit converts the LP residual signal to a high frequency signal. A high frequency envelope estimating unit(140) estimates LP coefficient about the envelop of the high frequency bandwidth. A high frequency synthesizing unit(150) obtains a high frequency bandwidth by synthesizing the LP residual signal. The high frequency synthesizing unit generates high frequency bandwidth by applying spectrum to high frequency bandwidth. An adder(170) outputs a voice signal by adding a low frequency bandwidth signal and a high frequency bandwidth signal.