Apparatus and method for transcoding between CELP type codecs with a different bandwidths

1. the art that the invention defined in the claims The invention will each other about the transcoding device and method between kelp codec scheme with a different bandwidth. 2. The invention attempts to solve the technical challenges The present invention, existing tandem (tandem), as well as to solve the disadvantages, such as deterioration in sound quality, a delay increases and the amount of calculation increases with the transcoding of the coding scheme, each other to implement a high-quality transcoding in the interworking between networks having different bandwidth, and each intended to provide kelp (CELP) codec scheme mutually encoding apparatus and a computer-readable recording medium recording a program for realizing the above method and the method between having a different bandwidth. 3. Resolution of the subject matter of the invention, The invention, together in the kelp (CELP) method codecs transcoding device between having different bandwidth, the input of the formant parameters coded in the input CELP format, bandwidth, and degree, the output bandwidth of the frame rate of the output CELP format and order, It converted to match the frame rate of the output parameter formant formant parameter converting means for generating (output formant filter coefficients of the CELP format); The formant parameter receives the formant filter coefficients of the output CELP format from the conversion means, and the output formant coefficient quantization means for quantizing in the format used in CELP codecs; Said input CELP format here to the input bandwidth of the excitation signal parameters encoded in the conversion according to the output bandwidth of the output CELP format to produce the output excitation signal parameters a signal parameter converting means; And comprises quantization means for quantizing the excitation signal in a format used by the excitation signal parameter by receiving the excitation signal from the parameter converting means, said output CELP codec. 4. An important use of the invention, The invention yiyongdoem like transcoding device between kelp (CELP) codec scheme.