Abstract
PURPOSE: An encoding/decoding apparatus and a method thereof are provided to efficiently extend bandwidth of a high frequency by controlling the energy of an input signal by using tonality of high frequency area. CONSTITUTION: A signal classification unit(205) determines an encoding mode of an input signal. If the encoding mode is determined as a CELP(Code Excited Linear Prediction) encoding mode, a CELP encoding unit(206) performs CELP encoding of a low frequency signal of the input signal. A TD(Time Domain) expansion encoding unit(207) performs expansion encoding of the high frequency signal of the input signal. If the encoding mode is determined as an FD(Frequency Domain) mode, a frequency converting unit(208) performs frequency conversion of the input signal. An FD encoding unit(209) performs FD encoding of the converted input signal. (Reference numerals) (205) Signal classification unit; (206) CELP encoding unit; (207) TD expansion encoding unit; (208) Frequency converting unit; (209) FD encoding unit; (AA) Bit stream
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