| 摘要 |
PROBLEM TO BE SOLVED: To provide an audio coding method of a transfer communication terminal that can realize higher compressibility than when the traditional LP coefficient is used and ensure higher sound quality by conducting LPC (Linear Predictive Coding) with using PLP (Perceptual Linear Prediction) coefficients. SOLUTION: An audio coding device of the transfer communication terminal includes a PLP coefficient calculating portion 20 processing an input signal and calculating PLP coefficient and gain, a V/UV determination portion 21 determining whether the input signal is a voiced signal or an unvoiced signal and outputting a determination signal and the voiced signal when the input signal is the voiced signal, a pitch calculating portion 22 calculating the pitch of the input signal output from the V/UV determination portion 21 and a parameter coding portion 23 conducting low bit rate coding by using PLP coefficient, gain and pitch based on the determination signal. COPYRIGHT: (C)2006,JPO&NCIPI
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